1
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Garcia-Sanchez T, Diaz-Anichtchenko D, Muñoz A, Rodriguez-Hernandez P, Marqueño T, Jafar M, Achary SN, Alabarse F, Errandonea D. High-Pressure X-ray Diffraction Study of Orthorhombic Ca 2Zr 5Ti 2O 16. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:2069-2077. [PMID: 36761229 PMCID: PMC9901213 DOI: 10.1021/acs.jpcc.2c08011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 01/11/2023] [Indexed: 06/18/2023]
Abstract
The orthorhombic polymorph of Ca2Zr5Ti2O16 (space group Pbca) has been studied by powder X-ray diffraction under high pressures up to 30 GPa using synchrotron radiation. We have found evidence of a structural phase transition at 12-13 GPa. The phase transition causes an enhancement of the crystal symmetry. The high-pressure phase is tetragonal, being described by space group I41/acd. The space groups of the high- and low-pressure phases have a group/subgroup relationship. However, the phase transition is accompanied by a discontinuous change in the unit-cell volume, indicating that the phase transition can be classified as first order. We have also performed density functional theory calculations. These simulations support the occurrence of the orthorhombic-to-tetragonal transition. The pressure-volume equation of state and axial compressibilities have been determined for both polymorphs. The results are compared with previous studies in related oxides.
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Affiliation(s)
- Tania Garcia-Sanchez
- Departamento
de Ingeniería Eléctrica, MALTA Consolider Team, Universitat Politècnica de València, Camino de Vera s/n., Valencia, 46022, Spain
| | - Daniel Diaz-Anichtchenko
- Departamento
de Física Aplicada—ICMUV, MALTA Consolider Team, Universitat de Valencia, Dr. Moliner 50, Burjassot Valencia, 46100, Spain
| | - Alfonso Muñoz
- Departamento
de Física, Instituto de Materiales y Nanotecnología,
MALTA Consolider Team, Universidad de La
Laguna, La Laguna, Tenerife 38205, Spain
| | - Placida Rodriguez-Hernandez
- Departamento
de Física, Instituto de Materiales y Nanotecnología,
MALTA Consolider Team, Universidad de La
Laguna, La Laguna, Tenerife 38205, Spain
| | - Tomas Marqueño
- Departamento
de Física Aplicada—ICMUV, MALTA Consolider Team, Universitat de Valencia, Dr. Moliner 50, Burjassot Valencia, 46100, Spain
| | - Mohsin Jafar
- Chemistry
Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | | | - Frederico Alabarse
- Xpress—High
pressure diffraction beamline, Elettra synchrotron, Triestre, 25032, Italy
| | - Daniel Errandonea
- Departamento
de Física Aplicada—ICMUV, MALTA Consolider Team, Universitat de Valencia, Dr. Moliner 50, Burjassot Valencia, 46100, Spain
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2
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Blackburn LR, Townsend LT, Lawson SM, Mason AR, Stennett MC, Sun SK, Gardner LJ, Maddrell ER, Corkhill CL, Hyatt NC. Phase Evolution in the CaZrTi 2O 7-Dy 2Ti 2O 7 System: A Potential Host Phase for Minor Actinide Immobilization. Inorg Chem 2022; 61:5744-5756. [PMID: 35377149 PMCID: PMC9019813 DOI: 10.1021/acs.inorgchem.1c03816] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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Zirconolite
is considered to be a suitable wasteform material for
the immobilization of Pu and other minor actinide species produced
through advanced nuclear separations. Here, we present a comprehensive
investigation of Dy3+ incorporation within the self-charge
balancing zirconolite Ca1–xZr1–xDy2xTi2O7 solid solution, with the view to simulate
trivalent minor actinide immobilization. Compositions in the substitution
range 0.10 ≤ x ≤ 1.00 (Δx = 0.10) were fabricated by a conventional mixed oxide
synthesis, with a two-step sintering regime at 1400 °C in air
for 48 h. Three distinct coexisting phase fields were identified,
with single-phase zirconolite-2M identified only for x = 0.10. A structural transformation from zirconolite-2M to zirconolite-4M
occurred in the range 0.20 ≤ x ≤ 0.30,
while a mixed-phase assemblage of zirconolite-4M and cubic pyrochlore
was evident at Dy concentrations 0.40 ≤ x ≤
0.50. Compositions for which x ≥ 0.60 were
consistent with single-phase pyrochlore. The formation of zirconolite-4M
and pyrochlore polytype phases, with increasing Dy content, was confirmed
by high-resolution transmission electron microscopy, coupled with
selected area electron diffraction. Analysis of the Dy L3-edge XANES region confirmed that Dy was present uniformly as Dy3+, remaining analogous to Am3+. Fitting of the
EXAFS region was consistent with Dy3+ cations distributed
across both Ca2+ and Zr4+ sites in both zirconolite-2M
and 4M, in agreement with the targeted self-compensating substitution
scheme, whereas Dy3+ was 8-fold coordinated in the pyrochlore
structure. The observed phase fields were contextualized within the
existing literature, demonstrating that phase transitions in CaZrTi2O7–REE3+Ti2O7 binary solid solutions are fundamentally controlled by the ratio
of ionic radius of REE3+ cations. Zirconolite (CaZrTi2O7) ceramics are
candidate wasteform materials for Pu and other minor actinides. Herein,
the Ca1−xZr1−xDy2xTi2O7 solid solution was fabricated by a conventional mixed oxide
synthesis, with Dy3+ included as a structural simulant
for Am3+. A phase transformation from zirconolite-2M to
zirconolite-4M was observed at low Dy concentrations (0.20 ≤ x ≤ 0.30) after which cubic pyrochlore was stabilized
as the dominant phase. Observations and interpretations were supported
by electron diffraction and X-ray absorption spectroscopic methods.
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Affiliation(s)
- Lewis R Blackburn
- Department of Materials Science and Engineering, Immobilisation Science Laboratory, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Luke T Townsend
- Department of Materials Science and Engineering, Immobilisation Science Laboratory, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Sebastian M Lawson
- Department of Materials Science and Engineering, Immobilisation Science Laboratory, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K.,GeoRoc International (GRI) Ltd, Whitehaven, Cumbria CA28 8PF, U.K
| | - Amber R Mason
- Department of Materials Science and Engineering, Immobilisation Science Laboratory, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Martin C Stennett
- Department of Materials Science and Engineering, Immobilisation Science Laboratory, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Shi-Kuan Sun
- Department of Materials Science and Engineering, Immobilisation Science Laboratory, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K.,School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China
| | - Laura J Gardner
- Department of Materials Science and Engineering, Immobilisation Science Laboratory, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Ewan R Maddrell
- National Nuclear Laboratory, Workington, Cumbria CA20 1PJ, U.K
| | - Claire L Corkhill
- Department of Materials Science and Engineering, Immobilisation Science Laboratory, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
| | - Neil C Hyatt
- Department of Materials Science and Engineering, Immobilisation Science Laboratory, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, U.K
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3
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Lee DW, Kim TH, Lee J, Park J, Kim JY, Ok KM, Lim SH. KIn 0.33IIITe 0.67VITe 2IVO 7: Zirconolite-like Mixed-Valent Metal Oxide with a 3D Framework. Inorg Chem 2021; 60:15091-15095. [PMID: 34585575 DOI: 10.1021/acs.inorgchem.1c01996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We provide the material synthesis method, crystal structure information, and characterization of a novel mixed-valent metal oxide KIn0.33IIITe0.67VITe2IVO7, closely related to zirconolite (CaZrTi2O7), a radioactive waste immobilized material, having a 3D framework. The reported metal oxide containing an alkali-metal cation (K+), main-group cation (In3+), tellurate, and tellurite has been synthesized as both single crystals and a pure polycrystalline phase through a hydrothermal synthesis method. Single-crystal X-ray diffraction indicates that KIn0.33Te2.67O7 crystallizing in the orthorhombic space group Cmcm (No. 63) reveals a 3D framework structure with a 1D channel consisting of Te/InO6 octahedra and TeO4 polyhedra. An interesting transition reaction from KIn0.33Te2.67O7 to KIn(TeO3)2 under hydrothermal conditions at 230 °C is discussed.
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Affiliation(s)
- Dong Woo Lee
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
| | - Tae-Hyeong Kim
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
| | - Jeongmook Lee
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.,Department of Radiochemistry and Nuclear Nonproliferation, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Junghwan Park
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.,Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Jong-Yun Kim
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.,Department of Radiochemistry and Nuclear Nonproliferation, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Kang Min Ok
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
| | - Sang Ho Lim
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.,Department of Radiochemistry and Nuclear Nonproliferation, University of Science and Technology, Daejeon 34113, Republic of Korea
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4
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Subramani T, Voskanyan A, Jayanthi K, Abramchuk M, Navrotsky A. A Comparison of Order-Disorder in Several Families of Cubic Oxides. Front Chem 2021; 9:719169. [PMID: 34540800 PMCID: PMC8440809 DOI: 10.3389/fchem.2021.719169] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 08/02/2021] [Indexed: 11/23/2022] Open
Abstract
Order-disorder on both cation and oxygen sites is a hallmark of fluorite-derived structures, including pyrochlores. Ordering can occur on long- and short-range scales and can result in persistent metastable states. In various cubic oxide systems, different types of disorder are seen. The purpose of this paper is to review and compare the types and energetics of order-disorder phenomena in several families of cubic oxides having pyrochlore, weberite, defect fluorite, perovskite, rocksalt, and spinel structures. The goal is to better understand how structure, composition, and thermodynamic parameters (enthalpy and entropy) determine the feasibility of different competing ordering processes and structures in these diverse systems.
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Affiliation(s)
| | | | | | | | - A. Navrotsky
- School of Molecular Sciences and Navrotsky Eyring Center for Materials of the Universe, Arizona State University, Tempe, AZ, United States
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5
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Blackburn LR, Sun SK, Lawson SM, Gardner LJ, Ding H, Corkhill CL, Maddrell ER, Stennett MC, Hyatt NC. Synthesis and characterisation of Ca1-xCexZrTi2-2xCr2xO7: Analogue zirconolite wasteform for the immobilisation of stockpiled UK plutonium. Ann Ital Chir 2020. [DOI: 10.1016/j.jeurceramsoc.2020.05.066] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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7
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Kearney JSC, Graužinytė M, Smith D, Sneed D, Childs C, Hinton J, Park C, Smith JS, Kim E, Fitch SDS, Hector AL, Pickard CJ, Flores‐Livas JA, Salamat A. Pressure-Tuneable Visible-Range Band Gap in the Ionic Spinel Tin Nitride. Angew Chem Int Ed Engl 2018; 57:11623-11628. [PMID: 30022577 PMCID: PMC6221123 DOI: 10.1002/anie.201805038] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 07/11/2018] [Indexed: 11/16/2022]
Abstract
The application of pressure allows systematic tuning of the charge density of a material cleanly, that is, without changes to the chemical composition via dopants, and exploratory high-pressure experiments can inform the design of bulk syntheses of materials that benefit from their properties under compression. The electronic and structural response of semiconducting tin nitride Sn3 N4 under compression is now reported. A continuous opening of the optical band gap was observed from 1.3 eV to 3.0 eV over a range of 100 GPa, a 540 nm blue-shift spanning the entire visible spectrum. The pressure-mediated band gap opening is general to this material across numerous high-density polymorphs, implicating the predominant ionic bonding in the material as the cause. The rate of decompression to ambient conditions permits access to recoverable metastable states with varying band gaps energies, opening the possibility of pressure-tuneable electronic properties for future applications.
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Affiliation(s)
- John S. C. Kearney
- Department of Physics and Astronomy, and HiPSECUniversity of Nevada, Las VegasLas VegasNV89154USA
| | | | - Dean Smith
- Department of Physics and Astronomy, and HiPSECUniversity of Nevada, Las VegasLas VegasNV89154USA
| | - Daniel Sneed
- Department of Physics and Astronomy, and HiPSECUniversity of Nevada, Las VegasLas VegasNV89154USA
| | - Christian Childs
- Department of Physics and Astronomy, and HiPSECUniversity of Nevada, Las VegasLas VegasNV89154USA
| | - Jasmine Hinton
- Department of Physics and Astronomy, and HiPSECUniversity of Nevada, Las VegasLas VegasNV89154USA
| | - Changyong Park
- High Pressure Collaborative Access TeamGeophysical Laboratory, Carnegie Institute of WashingtonArgonneIL60439USA
| | - Jesse S. Smith
- High Pressure Collaborative Access TeamGeophysical Laboratory, Carnegie Institute of WashingtonArgonneIL60439USA
| | - Eunja Kim
- Department of Physics and Astronomy, and HiPSECUniversity of Nevada, Las VegasLas VegasNV89154USA
| | | | | | - Chris J. Pickard
- Department of Materials Science and MetallurgyUniversity of CambridgeCambridgeCB3 0FSUK
- Advanced Institute for Materials ResearchTohoku UniversitySendai930-8577Japan
| | | | - Ashkan Salamat
- Department of Physics and Astronomy, and HiPSECUniversity of Nevada, Las VegasLas VegasNV89154USA
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8
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Kearney JSC, Graužinytė M, Smith D, Sneed D, Childs C, Hinton J, Park C, Smith JS, Kim E, Fitch SDS, Hector AL, Pickard CJ, Flores‐Livas JA, Salamat A. Pressure‐Tuneable Visible‐Range Band Gap in the Ionic Spinel Tin Nitride. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201805038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- John S. C. Kearney
- Department of Physics and Astronomy, and HiPSEC University of Nevada, Las Vegas Las Vegas NV 89154 USA
| | | | - Dean Smith
- Department of Physics and Astronomy, and HiPSEC University of Nevada, Las Vegas Las Vegas NV 89154 USA
| | - Daniel Sneed
- Department of Physics and Astronomy, and HiPSEC University of Nevada, Las Vegas Las Vegas NV 89154 USA
| | - Christian Childs
- Department of Physics and Astronomy, and HiPSEC University of Nevada, Las Vegas Las Vegas NV 89154 USA
| | - Jasmine Hinton
- Department of Physics and Astronomy, and HiPSEC University of Nevada, Las Vegas Las Vegas NV 89154 USA
| | - Changyong Park
- High Pressure Collaborative Access Team Geophysical Laboratory, Carnegie Institute of Washington Argonne IL 60439 USA
| | - Jesse S. Smith
- High Pressure Collaborative Access Team Geophysical Laboratory, Carnegie Institute of Washington Argonne IL 60439 USA
| | - Eunja Kim
- Department of Physics and Astronomy, and HiPSEC University of Nevada, Las Vegas Las Vegas NV 89154 USA
| | | | | | - Chris J. Pickard
- Department of Materials Science and Metallurgy University of Cambridge Cambridge CB3 0FS UK
- Advanced Institute for Materials Research Tohoku University Sendai 930-8577 Japan
| | | | - Ashkan Salamat
- Department of Physics and Astronomy, and HiPSEC University of Nevada, Las Vegas Las Vegas NV 89154 USA
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9
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Childs C, Lawler KV, Hector AL, Petitgirard S, Noked O, Smith JS, Daisenberger D, Bezacier L, Jura M, Pickard CJ, Salamat A. Covalency is Frustrating: La2Sn2O7 and the Nature of Bonding in Pyrochlores under High Pressure–Temperature Conditions. Inorg Chem 2018; 57:15051-15061. [DOI: 10.1021/acs.inorgchem.8b01419] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christian Childs
- Department of Physics and Astronomy and HiPSEC, University of Nevada Las Vegas, Las Vegas, Nevada 89154, United States
| | - Keith V. Lawler
- Department of Chemistry and Biochemistry and HiPSEC, University of Nevada Las Vegas, Las Vegas, Nevada 89154, United States
| | - Andrew L. Hector
- Department of Chemistry, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Sylvain Petitgirard
- Bayerisches GeoInstitut (BGI), University of Bayreuth, 95444 Bayreuth, Germany
| | - Ori Noked
- Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Jesse S. Smith
- High Pressure Collaborating Access Team at Advanced Photon Source, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, United States
| | | | - Lucile Bezacier
- European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, Cedex 9, France
| | - Marek Jura
- ISIS, STFC, Harwell Innovation Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Chris J. Pickard
- Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
- Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Ashkan Salamat
- Department of Physics and Astronomy and HiPSEC, University of Nevada Las Vegas, Las Vegas, Nevada 89154, United States
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10
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Paknahad E, Grosvenor AP. Investigation of CeTi2O6- and CaZrTi2O7-containing glass–ceramic composite materials. CAN J CHEM 2017. [DOI: 10.1139/cjc-2016-0633] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Glass–ceramic composite materials are being investigated for numerous applications (i.e., textile, energy storage, nuclear waste immobilization applications, etc.) due to the chemical durability and flexibility of these materials. Borosilicate and Fe–Al–borosilicate glass–ceramic composites containing brannerite (CeTi2O6) or zirconolite (CaZrTi2O7) crystallites were synthesized at different annealing temperatures. The objective of this study was to understand the interaction of brannerite or zirconolite-type crystallites within the glass matrix and to investigate how the local structure of these composite materials changed with changing synthesis conditions. Powder X-ray diffraction (XRD) and Backscattered electron (BSE) microprobe images have been used to study how the ceramic crystallites dispersed in the glass matrix. X-ray absorption near edge spectroscopy (XANES) spectra were also collected from all glass–ceramic composite materials. Examination of Ti K-, Ce L3-, Zr K-, Si L2,3-, Fe K-, and Al L2,3-edge XANES spectra from the glass–ceramic composites have shown that the annealing temperature, glass composition, and the loading of the ceramic crystallites in the glass matrix can affect the local environment of the glass–ceramic composite materials. A comparison of the glass–ceramic composites containing brannerite or zirconolite crystallites has shown that similar changes in the long range and local structure of these composite materials occur when the synthesis conditions to form these materials or the composition are changed.
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Affiliation(s)
- Elham Paknahad
- Department of Chemistry, University of Saskatchewan, Saskatoon, SK S7N 5C9, Canada
- Department of Chemistry, University of Saskatchewan, Saskatoon, SK S7N 5C9, Canada
| | - Andrew P. Grosvenor
- Department of Chemistry, University of Saskatchewan, Saskatoon, SK S7N 5C9, Canada
- Department of Chemistry, University of Saskatchewan, Saskatoon, SK S7N 5C9, Canada
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