1
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Xie Y, Wang J, Savitzky BH, Chen Z, Wang Y, Betzler S, Bustillo K, Persson K, Cui Y, Wang LW, Ophus C, Ercius P, Zheng H. Spatially resolved structural order in low-temperature liquid electrolyte. SCIENCE ADVANCES 2023; 9:eadc9721. [PMID: 36638171 DOI: 10.1126/sciadv.adc9721] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
Determining the degree and the spatial extent of structural order in liquids is a grand challenge. Here, we are able to resolve the structural order in a model organic electrolyte of 1 M lithium hexafluorophosphate (LiPF6) dissolved in 1:1 (v/v) ethylene carbonate:diethylcarbonate by developing an integrated method of liquid-phase transmission electron microscopy (TEM), cryo-TEM operated at -30°C, four-dimensional scanning TEM, and data analysis based on deep learning. This study reveals the presence of short-range order (SRO) in the high-salt concentration domains of the liquid electrolyte from liquid phase separation at the low temperature. Molecular dynamics simulations suggest the SRO originates from the Li+-(PF6-)n (n > 2) local structural order induced by high LiPF6 salt concentration.
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Affiliation(s)
- Yujun Xie
- Department of Nuclear Engineering, University of California, Berkeley, Berkeley, CA 94720, USA
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Jingyang Wang
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Department of Materials Science and Engineering, Stanford University, Palo Alto, CA 94305, USA
| | - Benjamin H Savitzky
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Zheng Chen
- Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT 06511, USA
| | - Yu Wang
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Sophia Betzler
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Karen Bustillo
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Kristin Persson
- Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Yi Cui
- Department of Materials Science and Engineering, Stanford University, Palo Alto, CA 94305, USA
| | - Lin-Wang Wang
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Colin Ophus
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Peter Ercius
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Haimei Zheng
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA 94720, USA
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2
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Lee SK, Lee AC, Kweon JJ. Probing Medium-Range Order in Oxide Glasses at High Pressure. J Phys Chem Lett 2021; 12:1330-1338. [PMID: 33502857 DOI: 10.1021/acs.jpclett.1c00055] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Densification in glassy networks has traditionally been described in terms of short-range structures, such as how atoms are coordinated and how the coordination polyhedron is linked in the second coordination environment. While changes in medium-range structures beyond the second coordination shells may play an important role, experimental verification of the densification beyond short-range structures is among the remaining challenges in the physical sciences. Here, a correlation NMR experiment for prototypical borate glasses under compression up to 9 GPa offers insights into the pressure-induced evolution of proximity among cations on a medium-range scale. Whereas amorphous networks at ambient pressure may favor the formation of medium-range clusters consisting primarily of similar coordination species, such segregation between distinct coordination environments tends to decrease with increasing pressure, promoting a more homogeneous distribution of dissimilar structural units. Together with an increase in the average coordination number, densification of glass accompanies a preferential rearrangement toward a random distribution, which may increase the configurational entropy. The results highlight the direct link between the pressure-induced increase in medium-range disorder and the densification of glasses under extreme compression.
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3
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Lee SK, Mun KY, Kim YH, Lhee J, Okuchi T, Lin JF. Degree of Permanent Densification in Oxide Glasses upon Extreme Compression up to 24 GPa at Room Temperature. J Phys Chem Lett 2020; 11:2917-2924. [PMID: 32223166 DOI: 10.1021/acs.jpclett.0c00709] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
During the decompression of plastically deformed glasses at room temperature, some aspects of irreversible densification may be preserved. This densification has been primarily attributed to topological changes in glass networks. The changes in short-range structures like cation coordination numbers are often assumed to be relaxed upon decompression. Here the NMR results for aluminosilicate glass upon permanent densification up to 24 GPa reveal noticeable changes in the Al coordination number under pressure conditions as low as ∼6 GPa. A drastic increase in the highly coordinated Al fraction is evident over only a relatively narrow pressure range of up to ∼12 GPa, above which the coordination change becomes negligible up to 24 GPa. In contrast, Si coordination environments do not change, highlighting preferential coordination transformation during deformation. The observed trend in the coordination environment shows a remarkable similarity to the pressure-induced changes in the residual glass density, yielding a predictive relationship between the irreversible densification and the detailed structures under extreme compression. The results open a way to access the nature of plastic deformation in complex glasses at room temperature.
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Affiliation(s)
- Sung Keun Lee
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
- Institute of Applied Physics, Seoul National University, Seoul 08826, Korea
| | - Kwan Young Mun
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
| | - Yong-Hyun Kim
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
| | - Juho Lhee
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Korea
| | - Takuo Okuchi
- Institute for Planetary Materials, Okayama University, Misasa 682-0193, Japan
| | - Jung-Fu Lin
- Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, United States
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4
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Benzine O, Bruns S, Pan Z, Durst K, Wondraczek L. Local Deformation of Glasses is Mediated by Rigidity Fluctuation on Nanometer Scale. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2018; 5:1800916. [PMID: 30356973 PMCID: PMC6193166 DOI: 10.1002/advs.201800916] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 07/23/2018] [Indexed: 05/06/2023]
Abstract
Microscopic deformation processes determine defect formation on glass surfaces and, thus, the material's resistance to mechanical failure. While the macroscopic strength of most glasses is not directly dependent on material composition, local deformation and flaw initiation are strongly affected by chemistry and atomic arrangement. Aside from empirical insight, however, the structural origin of the fundamental deformation modes remains largely unknown. Experimental methods that probe parameters on short or intermediate length-scale such as atom-atom or superstructural correlations are typically applied in the absence of alternatives. Drawing on recent experimental advances, spatially resolved Raman spectroscopy is now used in the THz-gap for mapping local changes in the low-frequency vibrational density of states. From direct observation of deformation-induced variations on the characteristic length-scale of molecular heterogeneity, it is revealed that rigidity fluctuation mediates the deformation process of inorganic glasses. Molecular field approximations, which are based solely on the observation of short-range (interatomic) interactions, fail in the prediction of mechanical behavior. Instead, glasses appear to respond to local mechanical contact in a way that is similar to that of granular media with high intergranular cohesion.
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Affiliation(s)
- Omar Benzine
- Otto Schott Institute of Materials ResearchUniversity of JenaFraunhoferstrasse 607743JenaGermany
| | - Sebastian Bruns
- Department of Materials SciencePhysical MetallurgyTechnical University of DarmstadtAlarich‐Weiss‐Straße 264287DarmstadtGermany
| | - Zhiwen Pan
- Otto Schott Institute of Materials ResearchUniversity of JenaFraunhoferstrasse 607743JenaGermany
| | - Karsten Durst
- Department of Materials SciencePhysical MetallurgyTechnical University of DarmstadtAlarich‐Weiss‐Straße 264287DarmstadtGermany
| | - Lothar Wondraczek
- Otto Schott Institute of Materials ResearchUniversity of JenaFraunhoferstrasse 607743JenaGermany
- Abbe Center of PhotonicsUniversity of JenaAlbert‐Einstein‐Strasse 607745JenaGermany
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5
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Guerette M, Ackerson MR, Thomas J, Watson EB, Huang L. Thermally induced amorphous to amorphous transition in hot-compressed silica glass. J Chem Phys 2018; 148:194501. [PMID: 30307254 DOI: 10.1063/1.5025592] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
In situ Raman and Brillouin light scattering techniques were used to study thermally induced high-density amorphous (HDA) to low-density amorphous (LDA) transition in silica glass densified in hot compression (up to 8 GPa at 1100 °C). Hot-compressed silica samples are shown to retain structural and mechanical stability through 600 °C or greater, with reduced sensitivity in elastic response to temperature as compared with pristine silica glass. Given sufficient thermal energy to overcome the energy barrier, the compacted structure of the HDA silica reverts back to the LDA state. The onset temperature for the HDA to LDA transition depends on the degree of densification during hot compression, commencing at lower temperatures for samples with higher density, but all finishing within a temperature range of 250-300 °C. Our studies show that the HDA to LDA transition at high temperatures in hot-compressed samples is different from the gradual changes starting from room temperature in cold-compressed silica glass, indicating greater structural homogeneity achieved by hot compression. Furthermore, the structure and properties of hot-compressed silica glass change continuously during the thermally induced HDA to LDA transition, in contrast to the abrupt and first-order-like polyamorphic transitions in amorphous ice. Different HDA to LDA transition mechanisms in amorphous silica and amorphous ice are explained by their different energy landscapes.
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Affiliation(s)
- Michael Guerette
- Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | - Michael R Ackerson
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA
| | - Jay Thomas
- Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | - E Bruce Watson
- Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | - Liping Huang
- Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
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6
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Petitgirard S, Malfait WJ, Journaux B, Collings IE, Jennings ES, Blanchard I, Kantor I, Kurnosov A, Cotte M, Dane T, Burghammer M, Rubie DC. SiO_{2} Glass Density to Lower-Mantle Pressures. PHYSICAL REVIEW LETTERS 2017; 119:215701. [PMID: 29219420 DOI: 10.1103/physrevlett.119.215701] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Indexed: 06/07/2023]
Abstract
The convection or settling of matter in the deep Earth's interior is mostly constrained by density variations between the different reservoirs. Knowledge of the density contrast between solid and molten silicates is thus of prime importance to understand and model the dynamic behavior of the past and present Earth. SiO_{2} is the main constituent of Earth's mantle and is the reference model system for the behavior of silicate melts at high pressure. Here, we apply our recently developed x-ray absorption technique to the density of SiO_{2} glass up to 110 GPa, doubling the pressure range for such measurements. Our density data validate recent molecular dynamics simulations and are in good agreement with previous experimental studies conducted at lower pressure. Silica glass rapidly densifies up to 40 GPa, but the density trend then flattens to become asymptotic to the density of SiO_{2} minerals above 60 GPa. The density data present two discontinuities at ∼17 and ∼60 GPa that can be related to a silicon coordination increase from 4 to a mixed 5/6 coordination and from 5/6 to sixfold, respectively. SiO_{2} glass becomes denser than MgSiO_{3} glass at ∼40 GPa, and its density becomes identical to that of MgSiO_{3} glass above 80 GPa. Our results on SiO_{2} glass may suggest that a variation of SiO_{2} content in a basaltic or pyrolitic melt with pressure has at most a minor effect on the final melt density, and iron partitioning between the melts and residual solids is the predominant factor that controls melt buoyancy in the lowermost mantle.
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Affiliation(s)
| | - Wim J Malfait
- Laboratory for Building Energy Materials and Components, Swiss Federal Laboratories for Materials Science and Technology, Empa, 8600 Dübendorf, Switzerland
| | - Baptiste Journaux
- Institut des Géosciences de l'Environnement-UMR 5001, Université Grenoble Alpes CS 40700, 38 058 Grenoble Cedex 9, France
| | - Ines E Collings
- Laboratory of Crystallography, University of Bayreuth, Bayreuth D-95440, Germany
- European Synchrotron Radiation Facility, BP 220, Grenoble F-38043, France
| | - Eleanor S Jennings
- Bayerisches Geoinstitut, University of Bayreuth, Bayreuth D-95440, Germany
| | - Ingrid Blanchard
- Bayerisches Geoinstitut, University of Bayreuth, Bayreuth D-95440, Germany
| | | | - Alexander Kurnosov
- Bayerisches Geoinstitut, University of Bayreuth, Bayreuth D-95440, Germany
| | - Marine Cotte
- European Synchrotron Radiation Facility, BP 220, Grenoble F-38043, France
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8220, Laboratoire d'archéologie moléculaire et structurale (LAMS), 4 Place Jussieu 75005 Paris, France
| | - Thomas Dane
- European Synchrotron Radiation Facility, BP 220, Grenoble F-38043, France
| | - Manfred Burghammer
- European Synchrotron Radiation Facility, BP 220, Grenoble F-38043, France
| | - David C Rubie
- Bayerisches Geoinstitut, University of Bayreuth, Bayreuth D-95440, Germany
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7
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Mantisi B, Kermouche G, Barthel E, Tanguy A. Impact of pressure on plastic yield in amorphous solids with open structure. Phys Rev E 2016; 93:033001. [PMID: 27078435 DOI: 10.1103/physreve.93.033001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Indexed: 11/07/2022]
Abstract
Plasticity in amorphous silica is unusual: The yield stress decreases with hydrostatic pressure, in contrast to the Mohr-Coulomb response commonly found in more compact materials such as bulk metallic glasses. To better understand this response, we have carried out molecular dynamics simulations of plastic response in a model glass with open structure. The simulations reproduce the anomalous dependence of yield stress with pressure and also correctly predict that the plastic response turns to normal once the material has been fully compacted. We also show that the overall shape of the yield surface is consistent with a quadratic behavior predicted assuming local buckling of the structure, a point of view that fits well into the present understanding of the deformation mechanisms of amorphous silica. The results also confirm that free volume is an adequate internal variable for a continuum scale description of the plastic response of amorphous silica. Finally, we also investigate the long-range correlations between rearrangement events. We find that strong intermittency is observed when the structure remains open, while compaction results in more homogeneous rearrangements. These findings are in agreement with recent results on the effect of compression on the middle range order in silicate glasses and also suggest that the well-known volume recovery of densified silica at relatively low temperatures is in fact a form of aging.
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Affiliation(s)
- B Mantisi
- Laboratoire de Physique Théorique de la Matière Condensée, Paris Sorbonne Universités UPMC, BP 121, 4 Place Jussieu, 75252 Paris Cedex 05, France
| | - G Kermouche
- Materials Sciences and Structures Division, Ecole des Mines de Saint-Etienne, LGF UMR No. 5307, CNRS, 158 Cours Fauriel, 42023 Saint-Etienne Cedex 2, France
| | - E Barthel
- École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris ParisTech, PSL Research University, Sciences et Ingénierie de la matière Molle, CNRS UMR No. 7615, 10 Rue Vauquelin, F-75231 Paris Cedex 05, France and Sorbonne-Universités, UPMC Université Paris 06, SIMM, 10 Rue Vauquelin, 75231 Paris Cedex 05, France
| | - A Tanguy
- Université de Lyon, LaMCoS, INSA-Lyon, CNRS UMR5259, F-69621, France
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8
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Pacaud F, Micoulaut M. Thermodynamic precursors, liquid-liquid transitions, dynamic and topological anomalies in densified liquid germania. J Chem Phys 2015; 143:064502. [DOI: 10.1063/1.4927707] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Deschamps T, Margueritat J, Martinet C, Mermet A, Champagnon B. Elastic moduli of permanently densified silica glasses. Sci Rep 2014; 4:7193. [PMID: 25431218 PMCID: PMC4246209 DOI: 10.1038/srep07193] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 11/04/2014] [Indexed: 12/19/2022] Open
Abstract
Modelling the mechanical response of silica glass is still challenging, due to the lack of knowledge concerning the elastic properties of intermediate states of densification. An extensive Brillouin Light Scattering study on permanently densified silica glasses after cold compression in diamond anvil cell has been carried out, in order to deduce the elastic properties of such glasses and to provide new insights concerning the densification process. From sound velocity measurements, we derive phenomenological laws linking the elastic moduli of silica glass as a function of its densification ratio. The found elastic moduli are in excellent agreement with the sparse data extracted from literature, and we show that they do not depend on the thermodynamic path taken during densification (room temperature or heating). We also demonstrate that the longitudinal sound velocity exhibits an anomalous behavior, displaying a minimum for a densification ratio of 5%, and highlight the fact that this anomaly has to be distinguished from the compressibility anomaly of a-SiO2 in the elastic domain.
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Affiliation(s)
- T Deschamps
- ILM, UMR5306 University Lyon 1-CNRS, University of Lyon, 69622 Villeurbanne cedex, France
| | - J Margueritat
- ILM, UMR5306 University Lyon 1-CNRS, University of Lyon, 69622 Villeurbanne cedex, France
| | - C Martinet
- ILM, UMR5306 University Lyon 1-CNRS, University of Lyon, 69622 Villeurbanne cedex, France
| | - A Mermet
- ILM, UMR5306 University Lyon 1-CNRS, University of Lyon, 69622 Villeurbanne cedex, France
| | - B Champagnon
- ILM, UMR5306 University Lyon 1-CNRS, University of Lyon, 69622 Villeurbanne cedex, France
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10
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Zanatta M, Baldi G, Brusa RS, Egger W, Fontana A, Gilioli E, Mariazzi S, Monaco G, Ravelli L, Sacchetti F. Structural evolution and medium range order in permanently densified vitreous SiO2. PHYSICAL REVIEW LETTERS 2014; 112:045501. [PMID: 24580465 DOI: 10.1103/physrevlett.112.045501] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Indexed: 06/03/2023]
Abstract
Positron annihilation lifetime spectroscopy is employed to measure the size of the interstitial void spaces characterizing the structure of a set of permanently densified SiO2 glasses. The average volume of the voids is markedly affected by the densification process and linearly shrinks by almost an order of magnitude after a relative density variation of 22%. In addition, x-ray diffraction shows that this change of density does not modify appreciably the short range order, which remains organized in SiO4 tetrahedra. These results strongly suggest a porous medium description for v-SiO2 glasses where the compressibility and the medium range order are dominated by the density variation of the voids volume up to densities close to that of α-quartz.
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Affiliation(s)
- M Zanatta
- Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy
| | - G Baldi
- IMEM-CNR, I-43124 Parma, Italy
| | - R S Brusa
- Dipartimento di Fisica, Università di Trento, I-38123 Povo, Trento, Italy
| | - W Egger
- Institut für Angewandte Physik und Messtechnik, Universität der Bundeswehr München, D-85577 Neubiberg, Germany
| | - A Fontana
- Dipartimento di Fisica, Università di Trento, I-38123 Povo, Trento, Italy
| | | | - S Mariazzi
- Dipartimento di Fisica, Università di Trento, I-38123 Povo, Trento, Italy
| | - G Monaco
- Dipartimento di Fisica, Università di Trento, I-38123 Povo, Trento, Italy
| | - L Ravelli
- Institut für Angewandte Physik und Messtechnik, Universität der Bundeswehr München, D-85577 Neubiberg, Germany
| | - F Sacchetti
- Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy and IOM-CNR c/o Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy
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11
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Probing the different spatial scales of Kel F-800 polymeric glass under pressure. Sci Rep 2013; 3:1290. [PMID: 23411501 PMCID: PMC3573337 DOI: 10.1038/srep01290] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Accepted: 01/21/2013] [Indexed: 11/08/2022] Open
Abstract
One of the fundamental open questions in condensed matter science is the origin of the unique universal characteristics of glasses. Among them, the Boson peak (BP) and the first sharp diffraction peak (FSDP) are directly related with the disordered nature of these solids. The lack of widely accepted understanding of the origin of these features makes the characterization of glass forming systems on the microscopic level challenging. Moreover a strong and open debate exists on the possible correlation between BP and FSDP and its origin. Here we present the first detailed concomitant Raman and x-ray diffraction study of these two features under hydrostatic pressure. Surprisingly, we find that the previously proposed correlations between the positions of BP and FSDP do not hold under pressure. Based on the anticorrelation of the characteristic dimensions, we conclude that, BP and FSDP probe different spatial scales corresponding to dynamical and structural dimensions, respectively.
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12
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Crupi C, D'Angelo G, Vasi C. Low-energy vibrational dynamics of cesium borate glasses. J Phys Chem B 2012; 116:6499-505. [PMID: 22546082 DOI: 10.1021/jp301230s] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Low-temperature specific heat and inelastic light scattering experiments have been performed on a series of cesium borate glasses and on a cesium borate crystal. Raman measurements on the crystalline sample have revealed the existence of cesium rattling modes in the same frequency region where glasses exhibit the boson peak (BP). These localized modes are supposed to overlap with the BP in cesium borate glasses affecting its magnitude. Their influence on the low frequency vibrational dynamics in glassy samples has been considered, and their contribution to the specific heat has been estimated. Evidence for a relation between the changes of the BP induced by the increased amount of metallic oxide and the variations of the elastic medium has been provided.
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Affiliation(s)
- C Crupi
- Dipartimento di Fisica, Università di Messina, Viale F. Stagno d'Alcontres 31, I-98166 Messina, Italy.
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13
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Tosheva L, Brockbank A, Mihailova B, Sutula J, Ludwig J, Potgieter H, Verran J. Micron- and nanosized FAU-type zeolites from fly ash for antibacterial applications. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm33180b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Deschamps T, Martinet C, de Ligny D, Bruneel JL, Champagnon B. Correlation between boson peak and anomalous elastic behavior in GeO2 glass: An in situ Raman scattering study under high-pressure. J Chem Phys 2011; 134:234503. [PMID: 21702563 DOI: 10.1063/1.3599939] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- T Deschamps
- Laboratoire de Physico-Chimie des Matériaux Luminescents, Domaine scientifique de la Doua, Université de Lyon, Université Lyon-1, UMR5620 CNRS, Bât. Kastler, 10 rue Ada Byron, 69622 Villeurbanne, France.
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15
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Effect of helium on structure and compression behavior of SiO2 glass. Proc Natl Acad Sci U S A 2011; 108:6004-7. [PMID: 21444785 DOI: 10.1073/pnas.1102361108] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The behavior of volatiles is crucial for understanding the evolution of the Earth's interior, hydrosphere, and atmosphere. Noble gases as neutral species can serve as probes and be used for examining gas solubility in silicate melts and structural responses to any gas inclusion. Here, we report experimental results that reveal a strong effect of helium on the intermediate range structural order of SiO(2) glass and an unusually rigid behavior of the glass. The structure factor data show that the first sharp diffraction peak position of SiO(2) glass in helium medium remains essentially the same under pressures up to 18.6 GPa, suggesting that helium may have entered in the voids in SiO(2) glass under pressure. The dissolved helium makes the SiO(2) glass much less compressible at high pressures. GeO(2) glass and SiO(2) glass with H(2) as pressure medium do not display this effect. These observations suggest that the effect of helium on the structure and compression of SiO(2) glass is unique.
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16
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Chen K, Ellenbroek WG, Zhang Z, Chen DTN, Yunker PJ, Henkes S, Brito C, Dauchot O, van Saarloos W, Liu AJ, Yodh AG. Low-frequency vibrations of soft colloidal glasses. PHYSICAL REVIEW LETTERS 2010; 105:025501. [PMID: 20867714 DOI: 10.1103/physrevlett.105.025501] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2010] [Indexed: 05/29/2023]
Abstract
We conduct experiments on two-dimensional packings of colloidal thermosensitive hydrogel particles whose packing fraction can be tuned above the jamming transition by varying the temperature. By measuring displacement correlations between particles, we extract the vibrational properties of a corresponding "shadow" system with the same configuration and interactions, but for which the dynamics of the particles are undamped. The vibrational properties are very similar to those predicted for zero-temperature sphere packings and found in atomic and molecular glasses; there is a boson peak at low frequency that shifts to higher frequency as the system is compressed above the jamming transition.
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Affiliation(s)
- Ke Chen
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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17
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D’Angelo G, Crupi C, Tripodo G, Salvato G. Relation between Low-Temperature Thermal Conductivity and the Specific Heat of Cesium Borate Glasses. J Phys Chem B 2010; 114:2467-75. [DOI: 10.1021/jp907152y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- G. D’Angelo
- Dipartimento di Fisica, Universita’ di Messina, Salita Sperone 31, I-98166 Messina, Italy, and Istituto per i Processi Chimico−Fisici del C. N. R., Sezione di Messina, Salita Sperone, I-98166 Messina, Italy
| | - C. Crupi
- Dipartimento di Fisica, Universita’ di Messina, Salita Sperone 31, I-98166 Messina, Italy, and Istituto per i Processi Chimico−Fisici del C. N. R., Sezione di Messina, Salita Sperone, I-98166 Messina, Italy
| | - G. Tripodo
- Dipartimento di Fisica, Universita’ di Messina, Salita Sperone 31, I-98166 Messina, Italy, and Istituto per i Processi Chimico−Fisici del C. N. R., Sezione di Messina, Salita Sperone, I-98166 Messina, Italy
| | - G. Salvato
- Dipartimento di Fisica, Universita’ di Messina, Salita Sperone 31, I-98166 Messina, Italy, and Istituto per i Processi Chimico−Fisici del C. N. R., Sezione di Messina, Salita Sperone, I-98166 Messina, Italy
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18
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Mantisi B, Adichtchev S, Sirotkin S, Rafaelly L, Wondraczek L, Behrens H, Marcenat C, Surovtsev NV, Pillonnet A, Duval E, Champagnon B, Mermet A. Non-Debye normalization of the glass vibrational density of states in mildly densified silicate glasses. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:025402. [PMID: 21386253 DOI: 10.1088/0953-8984/22/2/025402] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The evolution of the boson peak with densification at medium densification rates (up to 2.3%) in silicate glasses was followed through heat capacity measurements and low frequency Raman scattering. It is shown that the decrease of the boson peak induced by densification does not conform to that expected from a continuous medium; rather it follows a two step behaviour. The comparison of the heat capacity data with the Raman data shows that the light-vibration coupling coefficient is almost unaffected in this densification regime. These results are discussed in relation to the inhomogeneity of the glass elastic network at the nanometre scale.
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Affiliation(s)
- B Mantisi
- Laboratoire de Physico-Chimie des Matériaux Luminescents, Université de Lyon, Université Claude Bernard Lyon 1, UMR 5620 CNRS, 69622 Villeurbanne, France
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19
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Lee SK, Kim HN, Lee BH, Kim HI, Kim EJ. Nature of Chemical and Topological Disorder in Borogermanate Glasses: Insights from B-11 and O-17 Solid-State NMR and Quantum Chemical Calculations. J Phys Chem B 2009; 114:412-20. [DOI: 10.1021/jp9093113] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sung Keun Lee
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742, Korea
| | - Hyun Na Kim
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742, Korea
| | - Bum Han Lee
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742, Korea
| | - Hyo-Im Kim
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742, Korea
| | - Eun Jeong Kim
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742, Korea
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20
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Quitmann D, Soltwisch M. Intermediate-range order and the liquid ↔ glass transformation. ACTA ACUST UNITED AC 2009. [DOI: 10.1080/13642819808204954] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- D. Quitmann
- a Intitut für Experimentalphysik, Freie Universität Berlin , Arnimallee 14, D-14195 , Berlin , Germany
| | - M. Soltwisch
- a Intitut für Experimentalphysik, Freie Universität Berlin , Arnimallee 14, D-14195 , Berlin , Germany
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21
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Haines J, Levelut C, Isambert A, Hébert P, Kohara S, Keen DA, Hammouda T, Andrault D. Topologically Ordered Amorphous Silica Obtained from the Collapsed Siliceous Zeolite, Silicalite-1-F: A Step toward “Perfect” Glasses. J Am Chem Soc 2009; 131:12333-8. [DOI: 10.1021/ja904054v] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Julien Haines
- Institut Charles Gerhardt Montpellier, Equipe PMOF, UMR 5253 CNRS-UM2-ENSCM-UM1, Université Montpellier II, Sciences et Techniques du Languedoc, Place E. Bataillon cc1504, 34095 Montpellier Cedex 05, France, Laboratoire des Colloïdes, Verres et Nanomatériaux, UMR 5587 CNRS UM2, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France, CEA, DAM Le Ripault, F-37260 Monts, France, Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI, SPring-8) 1
| | - Claire Levelut
- Institut Charles Gerhardt Montpellier, Equipe PMOF, UMR 5253 CNRS-UM2-ENSCM-UM1, Université Montpellier II, Sciences et Techniques du Languedoc, Place E. Bataillon cc1504, 34095 Montpellier Cedex 05, France, Laboratoire des Colloïdes, Verres et Nanomatériaux, UMR 5587 CNRS UM2, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France, CEA, DAM Le Ripault, F-37260 Monts, France, Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI, SPring-8) 1
| | - Aude Isambert
- Institut Charles Gerhardt Montpellier, Equipe PMOF, UMR 5253 CNRS-UM2-ENSCM-UM1, Université Montpellier II, Sciences et Techniques du Languedoc, Place E. Bataillon cc1504, 34095 Montpellier Cedex 05, France, Laboratoire des Colloïdes, Verres et Nanomatériaux, UMR 5587 CNRS UM2, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France, CEA, DAM Le Ripault, F-37260 Monts, France, Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI, SPring-8) 1
| | - Philippe Hébert
- Institut Charles Gerhardt Montpellier, Equipe PMOF, UMR 5253 CNRS-UM2-ENSCM-UM1, Université Montpellier II, Sciences et Techniques du Languedoc, Place E. Bataillon cc1504, 34095 Montpellier Cedex 05, France, Laboratoire des Colloïdes, Verres et Nanomatériaux, UMR 5587 CNRS UM2, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France, CEA, DAM Le Ripault, F-37260 Monts, France, Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI, SPring-8) 1
| | - Shinji Kohara
- Institut Charles Gerhardt Montpellier, Equipe PMOF, UMR 5253 CNRS-UM2-ENSCM-UM1, Université Montpellier II, Sciences et Techniques du Languedoc, Place E. Bataillon cc1504, 34095 Montpellier Cedex 05, France, Laboratoire des Colloïdes, Verres et Nanomatériaux, UMR 5587 CNRS UM2, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France, CEA, DAM Le Ripault, F-37260 Monts, France, Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI, SPring-8) 1
| | - David A. Keen
- Institut Charles Gerhardt Montpellier, Equipe PMOF, UMR 5253 CNRS-UM2-ENSCM-UM1, Université Montpellier II, Sciences et Techniques du Languedoc, Place E. Bataillon cc1504, 34095 Montpellier Cedex 05, France, Laboratoire des Colloïdes, Verres et Nanomatériaux, UMR 5587 CNRS UM2, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France, CEA, DAM Le Ripault, F-37260 Monts, France, Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI, SPring-8) 1
| | - Tahar Hammouda
- Institut Charles Gerhardt Montpellier, Equipe PMOF, UMR 5253 CNRS-UM2-ENSCM-UM1, Université Montpellier II, Sciences et Techniques du Languedoc, Place E. Bataillon cc1504, 34095 Montpellier Cedex 05, France, Laboratoire des Colloïdes, Verres et Nanomatériaux, UMR 5587 CNRS UM2, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France, CEA, DAM Le Ripault, F-37260 Monts, France, Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI, SPring-8) 1
| | - Denis Andrault
- Institut Charles Gerhardt Montpellier, Equipe PMOF, UMR 5253 CNRS-UM2-ENSCM-UM1, Université Montpellier II, Sciences et Techniques du Languedoc, Place E. Bataillon cc1504, 34095 Montpellier Cedex 05, France, Laboratoire des Colloïdes, Verres et Nanomatériaux, UMR 5587 CNRS UM2, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France, CEA, DAM Le Ripault, F-37260 Monts, France, Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI, SPring-8) 1
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22
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Vaccari M, Aquilanti G, Pascarelli S, Mathon O. A new EXAFS investigation of local structural changes in amorphous and crystalline GeO(2) at high pressure. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:145403. [PMID: 21825334 DOI: 10.1088/0953-8984/21/14/145403] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Structural transformations at high pressure in amorphous and quartz-like crystalline GeO(2) have been investigated by using a Paris-Edinburgh press coupled to EXAFS spectroscopy. From both the germanium absorption edge position and the Ge-O distance evolution, new detailed information has been obtained about the pressure behavior of the short range order. Crystalline GeO(2) undergoes a transformation from four- to six-fold coordination at about 8.5 GPa, but at least the whole 6-12 GPa pressure range should be considered as the transition region. On the other hand, amorphous GeO(2) is characterized by a much more gradual structural change and the full octahedral state is not reached at 13 GPa as commonly believed. Furthermore, no support to the recently claimed fully pentahedral intermediate state can be given. EXAFS signals of glassy GeO(2) beyond the first Ge-O shell qualitatively confirm the continuous breakdown of the intermediate range order up to 10 GPa.
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Affiliation(s)
- M Vaccari
- European Synchrotron Radiation Facility, 6 rue Jules Horowitz, BP 220, 38043 Grenoble Cedex, France
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23
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Caponi S, Corezzi S, Fioretto D, Fontana A, Monaco G, Rossi F. Raman-scattering measurements of the vibrational density of states of a reactive mixture during polymerization: effect on the boson peak. PHYSICAL REVIEW LETTERS 2009; 102:027402. [PMID: 19257317 DOI: 10.1103/physrevlett.102.027402] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2008] [Revised: 10/07/2008] [Indexed: 05/27/2023]
Abstract
Raman-scattering measurements are used to follow the modification of the vibrational density of states in a reactive epoxy-amine mixture during isothermal polymerization. Combining them with Brillouin light and inelastic x-ray scattering measurements, we analyze the variations of the boson peak and of the Debye level while the system changes from liquid to glass upon increasing the number of covalent bonds among the constituent molecules. The shift and intensity variation of the boson peak are explained by the modification of the elastic properties throughout the reaction, and a master curve for the boson peak can therefore be obtained. Surprisingly, bond-induced modifications of the structure do not affect this master curve.
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Affiliation(s)
- S Caponi
- Dipartimento di Fisica, Università di Trento, Via Sommarive 14, I-38050 Povo (Trento), Italy
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24
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Shen G, Liermann HP, Sinogeikin S, Yang W, Hong X, Yoo CS, Cynn H. Distinct thermal behavior of GeO2 glass in tetrahedral, intermediate, and octahedral forms. Proc Natl Acad Sci U S A 2007; 104:14576-9. [PMID: 17804799 PMCID: PMC1976207 DOI: 10.1073/pnas.0703098104] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2007] [Indexed: 11/18/2022] Open
Abstract
One fascinating high-pressure behavior of tetrahedral glasses and melts is the local coordination change with increasing pressure, which provides a structural basis for understanding numerous anomalies in their high-pressure properties. Because the coordination change is often not retained upon decompression, studies must be conducted in situ. Previous in situ studies have revealed that the short-range order of tetrahedrally structured glasses and melts changes above a threshold pressure and gradually transforms to an octahedral form with further pressure increase. Here, we report a thermal effect associated with the coordination change at given pressures and show distinct thermal behaviors of GeO(2) glass in tetrahedral, octahedral, and their intermediate forms. An unusual thermally induced densification, as large as 16%, was observed on a GeO(2) glass at a pressure of 5.5 gigapascal (GPa), based on in situ density and x-ray diffraction measurements at simultaneously high pressures and high temperatures. The large thermal densification at high pressure was found to be associated with the 4- to 6-fold coordination increase. Experiments at other pressures show that the tetrahedral GeO(2) glass displayed small thermal densification at 3.3 GPa arising from the relaxation of intermediate range structure, whereas the octahedral glass at 12.3 GPa did not display any detectable thermal effects.
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Affiliation(s)
- Guoyin Shen
- High Pressure Collaborative Access Team, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL 60439, USA.
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25
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Niss K, Begen B, Frick B, Ollivier J, Beraud A, Sokolov A, Novikov VN, Alba-Simionesco C. Influence of pressure on the boson peak: stronger than elastic medium transformation. PHYSICAL REVIEW LETTERS 2007; 99:055502. [PMID: 17930767 DOI: 10.1103/physrevlett.99.055502] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2006] [Indexed: 05/25/2023]
Abstract
We study the changes in the low-frequency vibrational dynamics of poly(isobutylene) under pressure up to 1.4 GPa, corresponding to a density change of 20%. Combining inelastic neutron, x-ray, and Brillouin light scattering, we analyze the variations in the boson peak, transverse and longitudinal sound velocities, and the Debye level under pressure. We find that the boson peak variation under pressure cannot be explained by the elastic continuum transformation only. Surprisingly, the shape of the boson peak remains unchanged even at such high compression.
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Affiliation(s)
- K Niss
- Laboratoire de Chimie Physique, UMR 8000, Université Paris Sud and CNRS, Bâtiment 349, 91405 Orsay, France
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26
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Sefzik TH, Clark TM, Grandinetti PJ. A computational investigation of 17O quadrupolar coupling parameters and structure in alpha-quartz phase GeO2. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2007; 32:16-23. [PMID: 17686616 DOI: 10.1016/j.ssnmr.2007.07.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2007] [Revised: 06/04/2007] [Indexed: 05/16/2023]
Abstract
Ab initio band-structure calculations based on density functional theory have been completed for alpha-quartz phase GeO2 to obtain electric-field gradients (efg) for oxygen atoms, including those for GeO2 at elevated pressure and temperature. To interpret the resulting efg values and examine correlations between structure and 17O quadrupolar coupling parameters, additional ab initio self-consistent Hartree-Fock molecular orbital calculations were completed. The quadrupolar coupling constant was found to have a strong dependence on Ge-O distance and angleGe-O-Ge, with the quadrupolar asymmetry parameter being primarily dependent on angleGe-O-Ge. Analytical expressions describing these dependencies consistent with earlier investigations of analogous silicate compounds are also reported.
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Affiliation(s)
- Travis H Sefzik
- Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, OH 43210-1173, USA
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27
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Monaco A, Chumakov AI, Monaco G, Crichton WA, Meyer A, Comez L, Fioretto D, Korecki J, Rüffer R. Effect of densification on the density of vibrational states of glasses. PHYSICAL REVIEW LETTERS 2006; 97:135501. [PMID: 17026042 DOI: 10.1103/physrevlett.97.135501] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2006] [Indexed: 05/12/2023]
Abstract
We studied the effect of densification on the vibrational dynamics of a Na(2)FeSi(3)O(8) glass. The density of vibrational states (DOS) has been measured using nuclear inelastic scattering. The corresponding changes in the microscopic, intermediate-range, and macroscopic properties have also been investigated. The results reveal that, in the absence of local structure transformations, the Debye level and the glass-specific excess of vibrational states above it have the same dependence on density, and the evolution of the DOS is fully described by the transformation of the elastic medium.
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Affiliation(s)
- A Monaco
- European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France
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28
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Chong SH. Role of structural relaxations and vibrational excitations in the high-frequency dynamics of liquids and glasses. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 74:031205. [PMID: 17025616 DOI: 10.1103/physreve.74.031205] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2006] [Indexed: 05/12/2023]
Abstract
We present theoretical investigation on the high-frequency collective dynamics in liquids and glasses at microscopic length scales and in the terahertz frequency region based on the mode-coupling theory for ideal liquid-glass transition. We focus on recently investigated issues from inelastic-x-ray-scattering and computer-simulation studies for dynamic structure factors and longitudinal and transversal current spectra: the anomalous dispersion of the high-frequency sound velocity and the nature of the low-frequency excitation called the boson peak. It will be discussed how the sound mode interferes with other low-lying modes present in the system. Thereby, we provide a systematic explanation of the anomalous sound-velocity dispersion in systems--ranging from high temperature liquid down to deep inside the glass state--in terms of the contributions from the structural-relaxation processes and from vibrational excitations called the anomalous-oscillation peak (AOP). A possibility of observing negative dispersion--the decrease of the sound velocity upon increase of the wave number--is argued when the sound-velocity dispersion is dominated by the contribution from the vibrational dynamics. We also show that the low-frequency excitation, observable in both of the glass-state longitudinal and transversal current spectra at the same resonance frequency, is the manifestation of the AOP. As a consequence of the presence of the AOP in the transversal current spectra, it is predicted that the transversal sound velocity also exhibits the anomalous dispersion. These results of the theory are demonstrated for a model of the Lennard-Jones system.
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Affiliation(s)
- Song-Ho Chong
- Institute for Molecular Science, Okazaki 444-8585, Japan.
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29
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Lee SK, Lee BH. Atomistic Origin of Germanate Anomaly in GeO2 and Na-Germanate Glasses: Insights from Two-Dimensional 17O NMR and Quantum Chemical Calculations. J Phys Chem B 2006; 110:16408-12. [PMID: 16913771 DOI: 10.1021/jp063847b] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The prominent problem in archetypal germanate glasses is the germanate anomaly where the density exhibits maxima at 15-20 mol % of the alkali oxide content. Here we report (17)O two-dimensional NMR spectra for GeO(2) and Na-germanate glasses where the presence of both bridging oxygen linking ([4])Ge and highly coordinated Ge (([5,6])Ge-O-([4])Ge) and nonbridging oxygen, and an increase in topological disorder are demonstrated at the density maximum, manifesting atomic origins of the anomaly. These densification mechanisms in germanate glasses with Na content are remarkably similar to densification in v-B(2)O(3) with pressure.
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Affiliation(s)
- Sung Keun Lee
- Laboratory of Physics and Chemistry of Earth Materials, School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, Korea.
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30
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Micoulaut M, Guissani Y, Guillot B. Simulated structural and thermal properties of glassy and liquid germania. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 73:031504. [PMID: 16605529 DOI: 10.1103/physreve.73.031504] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2005] [Revised: 01/10/2006] [Indexed: 05/08/2023]
Abstract
Structural, dynamical, and thermal properties of germanium dioxide are investigated with classical molecular dynamics simulations from the amorphous to the liquid state. Pair correlation functions and coordination numbers are computed under pressure change and show the progressive conversion of the tetrahedral network into an octahedral network, in agreement with experiments. The thermodynamical behavior of the liquid is investigated by means of an equation of state that allows a precise estimation of the compressibility. At low temperature, the diffusion constant D shows an Arrhenius law that progressively deviates when the temperature is increased. The overall comparison with simulated silica permits finally to outline not only the differences in the physical behavior of these two similar systems but also to stress the limitation of the employed germania potential.
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Affiliation(s)
- M Micoulaut
- Laboratoire de Physique Théorique de la Matière Condensée, CNRS UMR 7600, Université Pierre et Marie Curie, Boite 121, 4, Place Jussieu, 75252 Paris Cedex 05, France
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31
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Gutiérrez G, Rogan J. Structure of liquid GeO2 from a computer simulation model. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2004; 69:031201. [PMID: 15089274 DOI: 10.1103/physreve.69.031201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2003] [Indexed: 05/24/2023]
Abstract
The structural properties of liquid GeO2 are investigated by means of molecular dynamics simulation using a pairwise potential. The simulations were performed in the microcanonical ensemble on systems with up to 576 particles prepared at 21 different densities, corresponding to pressures from -2 to 30 GPa, and temperatures of 1500 K and 3000 K. The pair correlation function, coordination number, angular distribution, and both the neutron and x-ray static structure factors are obtained and compared with those of liquid silica. The analysis of these results for the system at zero pressure indicates that in the liquid state the short range order is dominated by the presence of slightly distorted Ge(O(1/2))(4) tetrahedra. These tetrahedra are linked to each other mainly through the corners, with a Ge-O-Ge angle of approximately 130 degrees, similar to the amorphous phase. Beyond the basic tetrahedron some order persists, but to less extent than in liquid silica. Simulation of systems at higher densities shows a volume collapse in the pressure-volume curve in the range of 4-8 GPa, suggesting the possibility that a liquid-liquid phase transition occurs, as the one observed in the amorphous phase.
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Affiliation(s)
- Gonzalo Gutiérrez
- Departamento de Física, Universidad de Santiago de Chile, Casilla 307, Santiago 2, Chile.
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32
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Sampath S, Benmore CJ, Lantzky KM, Neuefeind J, Leinenweber K, Price DL, Yarger JL. Intermediate-range order in permanently densified GeO2 glass. PHYSICAL REVIEW LETTERS 2003; 90:115502. [PMID: 12688939 DOI: 10.1103/physrevlett.90.115502] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2002] [Indexed: 05/24/2023]
Abstract
Information about the partial structure factors of densified GeO2 glass has been obtained from neutron and x-ray diffraction measurements. Densification causes a reduction in the length scale of the intermediate range order (IRO). The difference structure factors obtained by combining the x-ray and neutron data so as to eliminate one partial structure factor at a time shows the greatest effects when the Ge-Ge correlations are eliminated and least when O-O correlations are eliminated. This implies that the reduced length scale results from a decrease in the next-nearest neighbor Ge-O and O-O distance caused by a rotation about the Ge-O-Ge bonds and a distortion of the GeO4 tetrahedra.
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Affiliation(s)
- S Sampath
- University of Wyoming, Department of Chemistry, Laramie, Wyoming 82071-3838, USA
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33
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Cailliaux A, Alba-Simionesco C, Frick B, Willner L, Goncharenko I. Local structure and glass transition of polybutadiene up to 4 GPa. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2003; 67:010802. [PMID: 12636483 DOI: 10.1103/physreve.67.010802] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2002] [Indexed: 05/24/2023]
Abstract
This communication presents a determination of the glass transition of polybutadiene under very high pressure, and raises the problem of the determination of the relative effects of temperature and density on the glass transition, depending on the pressure and temperature conditions. Local structure and slow dynamics were studied, by neutron scattering and calorimetry. To the best of our knowledge in neutron diffraction on soft matter such a high pressure, up to 4 GPa, was achieved.
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Affiliation(s)
- A Cailliaux
- Laboratoire de Chimie Physique, Bâtiment 349, Université Paris-Sud, 91405 Orsay, France
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34
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Theenhaus T, Schilling R, Latz A, Letz M. Microscopic dynamics of molecular liquids and glasses: role of orientations and translation-rotation coupling. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2001; 64:051505. [PMID: 11735927 DOI: 10.1103/physreve.64.051505] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2001] [Indexed: 05/23/2023]
Abstract
We investigate the dynamics of a fluid of dipolar hard spheres in its liquid and glassy phases, with emphasis on the microscopic time or frequency regime. This system shows rather different glass transition scenarios related to its rich equilibrium behavior, which ranges from a simple hard sphere fluid to long range ferroelectric orientational order. In the liquid phase close to the ideal glass transition line and in the glassy regime a medium range orientational order occurs leading to a softening of an orientational mode. To investigate the role of this mode we use the molecular mode-coupling equations to calculate the spectra straight phi"lm(q,omega) and chi"lm(q,omega). In the center of mass spectra straight phi"00(q,omega) and chi"00(q,omega) we found, besides a high frequency peak at omega(hf), a peak at omega(op), about one decade below omega(hf) x omega(op) has almost no q dependence and exhibits an "isotope" effect omega(op) proportional to I(-1/2), with I the moment of inertia. We give evidence that the existence of this peak is related to the occurrence of medium range orientational order. It is shown that some of these features also exist for schematic mode coupling models.
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Affiliation(s)
- T Theenhaus
- Institut für Physik, Johannes Gutenberg-Universität, Staudinger Weg 7, D-55099 Mainz, Germany
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