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

Abstract

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.

Authors:
 [1];  [2];  [3];  [3]
  1. Univ. of Valencia (Spain)
  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)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear Science and Security Consortium
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1454612
Grant/Contract Number:  
NA0000979
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 181; Journal Issue: 2; Journal ID: ISSN 0022-4596
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Errandonea, Daniel, Kumar, Ravhi S., Ma, Xinghua, and Tu, Chaoyang. High-pressure X-ray diffraction study of SrMoO4 and pressure-induced structural changes. United States: N. p., 2007. Web. doi:10.1016/j.jssc.2007.12.010.
Errandonea, Daniel, Kumar, Ravhi S., Ma, Xinghua, & Tu, Chaoyang. High-pressure X-ray diffraction study of SrMoO4 and pressure-induced structural changes. United States. https://doi.org/10.1016/j.jssc.2007.12.010
Errandonea, Daniel, Kumar, Ravhi S., Ma, Xinghua, and Tu, Chaoyang. 2007. "High-pressure X-ray diffraction study of SrMoO4 and pressure-induced structural changes". United States. https://doi.org/10.1016/j.jssc.2007.12.010. https://www.osti.gov/servlets/purl/1454612.
@article{osti_1454612,
title = {High-pressure X-ray diffraction study of SrMoO4 and pressure-induced structural changes},
author = {Errandonea, Daniel and Kumar, Ravhi S. and Ma, Xinghua and Tu, Chaoyang},
abstractNote = {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.},
doi = {10.1016/j.jssc.2007.12.010},
url = {https://www.osti.gov/biblio/1454612}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 2,
volume = 181,
place = {United States},
year = {Sun Dec 09 00:00:00 EST 2007},
month = {Sun Dec 09 00:00:00 EST 2007}
}

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