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High-pressure X-ray diffraction study of SrMoO4 and pressure-induced structural changes

Journal Article · · Journal of Solid State Chemistry
 [1];  [2];  [3];  [3]
  1. Univ. of Valencia (Spain); Nuclear Science and Security Consortium
  2. Univ. of Nevada, Las Vegas, NV (United States)
  3. Chinese Academy of Sciences (CAS), Fujian (China); Graduated School of Chinese Academy of Science, Beijing (China)
SrMoO4 was studied under compression up to 25 GPa by angle-dispersive x-ray diffraction. A phase transition was observed from the scheelite-structured ambient phase to a monoclinic fergusonite phase at 12.2(9) GPa with cell parameters a = 5.265(9) A, b = 11.191(9) A, c = 5.195 (5) A, and beta = 90.9(1)°, Z = 4 at 13.1 GPa. There is no significant volume collapse at the phase transition. No additional phase transitions were observed and on release of pressure the initial phase is recovered, implying that the observed structural modifications are reversible. The reported transition appeared to be a ferroelastic second-order transformation producing a structure that is a monoclinic distortion of the low-pressure phase and was previously observed in compounds isostructural to SrMoO4. A possible mechanism for the transition is proposed and its character is discussed in terms of the present data and the Landau theory. Finally, the EOS is reported and the anisotropic compressibility of the studied crystal is discussed in terms of the compression of the Sr-O and Mo-O bonds.
Research Organization:
Nuclear Science and Security Consortium, Berkeley, CA (united States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0000979
OSTI ID:
1454612
Alternate ID(s):
OSTI ID: 21043899
Journal Information:
Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 181; ISSN 0022-4596
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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High-pressure phase transformations in NdVO 4 under hydrostatic, conditions: a structural powder x-ray diffraction study journal March 2019
High-pressure polymorphs of gadolinium orthovanadate: X-ray diffraction, Raman spectroscopy, and ab initio calculations journal August 2019
Combined Raman scattering and ab initio investigation of pressure-induced structural phase transitions in the scintillator ZnWO 4 journal August 2008
Characterization of the TiSiO 4 structure and its pressure-induced phase transformations: Density functional theory study journal September 2009
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