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Aeschlimann S, Lyu L, Becker S, Mousavion S, Speck T, Elmers H, Stadtmüller B, Aeschlimann M, Bechstein R, Kühnle A. Von geordneten zu mobilen Molekülen durch Kühlen. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202105100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Simon Aeschlimann
- Institut für Physikalische Chemie Johannes Gutenberg-Universität Mainz Duesbergweg 10–14 55099 Mainz Deutschland
- Graduiertenschule Materials Science in Mainz Staudingerweg 9 55128 Mainz Deutschland
| | - Lu Lyu
- Fachbereich Physik und Forschungszentrum OPTIMAS Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 46 67663 Kaiserslautern Deutschland
| | - Sebastian Becker
- Fachbereich Physik und Forschungszentrum OPTIMAS Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 46 67663 Kaiserslautern Deutschland
| | - Sina Mousavion
- Fachbereich Physik und Forschungszentrum OPTIMAS Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 46 67663 Kaiserslautern Deutschland
| | - Thomas Speck
- Institut für Physik Johannes Gutenberg-Universität Mainz Staudingerweg 7 55128 Mainz Deutschland
| | - Hans‐Joachim Elmers
- Institut für Physik Johannes Gutenberg-Universität Mainz Staudingerweg 7 55128 Mainz Deutschland
| | - Benjamin Stadtmüller
- Fachbereich Physik und Forschungszentrum OPTIMAS Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 46 67663 Kaiserslautern Deutschland
| | - Martin Aeschlimann
- Fachbereich Physik und Forschungszentrum OPTIMAS Technische Universität Kaiserslautern Erwin-Schrödinger-Straße 46 67663 Kaiserslautern Deutschland
| | - Ralf Bechstein
- Physikalische Chemie I Fakultät für Chemie Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Angelika Kühnle
- Physikalische Chemie I Fakultät für Chemie Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Deutschland
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Aeschlimann S, Lyu L, Becker S, Mousavion S, Speck T, Elmers HJ, Stadtmüller B, Aeschlimann M, Bechstein R, Kühnle A. Mobilization upon Cooling. Angew Chem Int Ed Engl 2021; 60:19117-19122. [PMID: 34152050 PMCID: PMC8457188 DOI: 10.1002/anie.202105100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 06/07/2021] [Indexed: 11/08/2022]
Abstract
Phase transitions between different aggregate states are omnipresent in nature and technology. Conventionally, a crystalline phase melts upon heating as we use ice to cool a drink. Already in 1903, Gustav Tammann speculated about the opposite process, namely melting upon cooling. So far, evidence for such "inverse" transitions in real materials is rare and limited to few systems or extreme conditions. Here, we demonstrate an inverse phase transition for molecules adsorbed on a surface. Molybdenum tetraacetate on copper(111) forms an ordered structure at room temperature, which dissolves upon cooling. This transition is mediated by molecules becoming mobile, i.e., by mobilization upon cooling. This unexpected phenomenon is ascribed to the larger number of internal degrees of freedom in the ordered phase compared to the mobile phase at low temperatures.
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Affiliation(s)
- Simon Aeschlimann
- Institute of Physical Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55099, Mainz, Germany.,Graduate School Materials Science in Mainz, Staudingerweg 9, 55128, Mainz, Germany
| | - Lu Lyu
- Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Strasse 46, 67663, Kaiserslautern, Germany
| | - Sebastian Becker
- Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Strasse 46, 67663, Kaiserslautern, Germany
| | - Sina Mousavion
- Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Strasse 46, 67663, Kaiserslautern, Germany
| | - Thomas Speck
- Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128, Mainz, Germany
| | - Hans-Joachim Elmers
- Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128, Mainz, Germany
| | - Benjamin Stadtmüller
- Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Strasse 46, 67663, Kaiserslautern, Germany
| | - Martin Aeschlimann
- Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Strasse 46, 67663, Kaiserslautern, Germany
| | - Ralf Bechstein
- Physical Chemistry I, Faculty of Chemistry, Bielefeld University, Universitätsstrasse 25, 33615, Bielefeld, Germany
| | - Angelika Kühnle
- Physical Chemistry I, Faculty of Chemistry, Bielefeld University, Universitätsstrasse 25, 33615, Bielefeld, Germany
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Han FF, Inoue A, Han Y, Kong FL, Zhu SL, Shalaan E, Al-Marzouki F, Greer AL. Novel Heating-Induced Reversion during Crystallization of Al-based Glassy Alloys. Sci Rep 2017; 7:46113. [PMID: 28406157 PMCID: PMC5390259 DOI: 10.1038/srep46113] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Accepted: 03/08/2017] [Indexed: 11/17/2022] Open
Abstract
Thermal stability and crystallization of three multicomponent glassy alloys, Al86Y7Ni5Co1Fe0.5Pd0.5, Al85Y8Ni5Co1Fe0.5Pd0.5 and Al84Y9Ni4Co1.5Fe0.5Pd1, were examined to assess the ability to form the mixture of amorphous (am) and fcc-aluminum (α-Al) phases. On heating, the glass transition into the supercooled liquid is shown by the 85Al and 84Al glasses. The crystallization sequences are [am] → [am + α-Al] → [α-Al + compounds] for the 86Al and 85Al alloys, and [am] → [am + α-Al + cubic AlxMy (M = Y, Ni, Co, Fe, Pd)] → [am + α-Al] → [α-Al + Al3Y + Al9(Co, Ni)2 + unknown phase] for the 84Al alloy. The glass transition appears even for the 85Al alloy where the primary phase is α-Al. The heating-induced reversion from [am + α-Al + multicomponent AlxMy] to [am + α-Al] for the 84Al alloy is abnormal, not previously observed in crystallization of glassy alloys, and seems to originate from instability of the metastable AlxMy compound, in which significant inhomogeneous strain is caused by the mixture of solute elements. This novel reversion phenomenon is encouraging for obtaining the [am + α-Al] mixture over a wide range of high temperature effective for the formation of Al-based high-strength nanostructured bulk alloys by warm working.
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Affiliation(s)
- F F Han
- School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - A Inoue
- School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China.,International Institute of Green Materials, Josai International University, Togane, 283-8555, Japan.,Department of Physics, King Abdulaziz University, Jeddah, 22254, Saudi Arabia.,MISiS, National University of Science and Technology, Moscow, 119049, Russia
| | - Y Han
- School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - F L Kong
- International Institute of Green Materials, Josai International University, Togane, 283-8555, Japan
| | - S L Zhu
- School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - E Shalaan
- Department of Physics, King Abdulaziz University, Jeddah, 22254, Saudi Arabia
| | - F Al-Marzouki
- Department of Physics, King Abdulaziz University, Jeddah, 22254, Saudi Arabia
| | - A L Greer
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB3 0FS, UK
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Nayar D, Chakravarty C. Water and water-like liquids: relationships between structure, entropy and mobility. Phys Chem Chem Phys 2013; 15:14162-77. [PMID: 23892732 DOI: 10.1039/c3cp51114f] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Liquids with very diverse underlying interactions share the thermodynamic and transport anomalies of water, including metalloids, ionic melts and mesoscopic fluids. The generic feature that characterises such water-like liquids is a density-driven shift in the nature of local order in the condensed phases. The key semiquantitative relationships between structural order, thermodynamics and transport that are necessary in order to map out the consequences of this common qualitative feature for liquid-state properties and phase transformations of such systems are reviewed here. The application of these ideas to understand and model tetrahedral liquids, especially water, is discussed and possible extensions to other complex fluids are considered.
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Affiliation(s)
- Divya Nayar
- Department of Chemistry, Indian Institute of Technology-Delhi, New Delhi, 110016, India
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Abstract
ABSTRACTInverse melting of bcc Nb4sCr55 is investigated using transmission electron microscopy, high-resolution TEM and electron diffraction. It is shown that the transformation to the amorphous phase initiates at the bcc grain boundaries. The transformation results in an increase in incoherence, evidenced by a loss of bend contours. Some anisotropy is found in the amorphous phase produced by inverse melting, which is associated in HRTEM with preferentially oriented but discontinuous and distorted fringes. The results are consistent with the production of an amorphous phase by inverse melting.
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Abstract
AbstractIn the process of inverse melting, a crystalline solid solution on cooling becomes less energetically stable than the isocompositional undercooled liquid or amorphous phase. Due to this, the crystal may transform polymorphously to the amorphous or liquid phase. A thermodynamic requirement for this process is the presence of two crossing points of the free energy curves G(T) of the crystalline and liquid or amorphous phases. Fulfillment of the thermodynamic requirement is however not a sufficient criterion for inverse melting to occur. In the present work the question posed in the title is addressed from both a thermodynamic as well as a kinetic standpoint. It is shown that in bcc phases which would otherwise undergo inverse melting, the presence of an energetically favorable B2 phase may prevent inverse melting due to its fast ordering kinetics. This imposes an e/a limit to the occurrence of inverse melting.
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Schupper N, Shnerb NM. Inverse melting and inverse freezing: a spin model. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2005; 72:046107. [PMID: 16383468 DOI: 10.1103/physreve.72.046107] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2005] [Indexed: 05/05/2023]
Abstract
Systems of highly degenerate ordered or frozen state may exhibit inverse melting (reversible crystallization upon heating) or inverse freezing (reversible glass transition upon heating). This phenomenon is reviewed, and a list of experimental demonstrations and theoretical models is presented. A simple spin model for inverse melting is introduced and solved analytically for infinite range, constant paramagnetic exchange interaction. The random exchange analogue of this model yields inverse freezing, as implied by the analytic solution based on the replica trick. The qualitative features of this system (generalized Blume-Capel spin model) are shown to resemble a large class of inverse melting phenomena. The appearance of inverse melting is related to an exact rescaling of one of the interaction parameters that measures the entropy of the system. For the case of almost degenerate spin states, perturbative expansion is presented, and the first three terms correspond to the empiric formula for the Flory-Huggins chi parameter in the theory of polymer melts. The possible microscopic origin of this chi parameter and the limitations of the Flory-Huggins theory where the state degeneracy is associated with the different conformations of a single polymer or with the spatial structures of two interacting molecules are discussed.
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Affiliation(s)
- Nurith Schupper
- Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
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Gong WL, Wang LM, Ewing RC, Fei Y. Surface and grain-boundary amorphization: Thermodynamic melting of coesite below the glass transition temperature. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:2155-2158. [PMID: 9983698 DOI: 10.1103/physrevb.53.2155] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Tanimura M, Inoue Y, Koyama Y. Features of a eutectoid reaction in a Ti-40 at. % Al alloy: Evidence for an amorphous-state formation from a crystal. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:15239-15243. [PMID: 9980878 DOI: 10.1103/physrevb.52.15239] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Gaffet E, Abdellaoui M, Malhouroux-Gaffet N. Formation of Nanostructural Materials Induced by Mechanical Processings ( Overview). ACTA ACUST UNITED AC 1995. [DOI: 10.2320/matertrans1989.36.198] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- E. Gaffet
- CNRS UPR A0423, “Far from equilibrium phase transitions” Group, Institut Polytechnique de Sévenans
| | - M. Abdellaoui
- CNRS UPR A0423, “Far from equilibrium phase transitions” Group, Institut Polytechnique de Sévenans
| | - N. Malhouroux-Gaffet
- CNRS UPR A0423, “Far from equilibrium phase transitions” Group, Institut Polytechnique de Sévenans
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