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Title: Pressure-induced phase transitions of β-type pyrochlore CsTaWO 6

Abstract

The β-type pyrochlore CsTaWO 6 was studied by synchrotron X-ray diffraction (XRD) and Raman scattering methods up to pressures of 43 GPa using a diamond anvil cell (DAC). With increasing pressure, the cubic pyrochlore in space group of Fd-3¯m with combining macron]m transforms to an orthorhombic structure (space group: Pnma) at 5.9 GPa and then to a monoclinic structure (space group: P2 1/c) at ~18 GPa. The structural evolution in CsTaWO 6 is a continuous process and experimental results suggest that the initial cubic phase has a tetragonal distortion at ambient conditions. Both XRD and Raman measurements indicate that the pressure-induced phase transitions in CsTaWO 6 are reversible. Lastly, these results may provide a structural explanation of previous experimental resistivity measurement results for the isostructural superconductor K(Cs)Os 2O 6 at high pressure conditions.

Authors:
 [1];  [2];  [3];  [3];  [3];  [2];  [4];  [5];  [2]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Stanford Univ., Stanford, CA (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); Carnegie Institution of Washington, Washington, D.C. (United States)
  5. Univ. of Chicago, Chicago, IL (United States)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States); Carnegie Institution of Washington, Washington, D.C. (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1329475
Grant/Contract Number:  
NA0001977; NA0002006
Resource Type:
Accepted Manuscript
Journal Name:
RSC Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 97; Journal ID: ISSN 2046-2069
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhang, F. X., Tracy, C. L., Shamblin, J., Palomares, R. I., Lang, M., Park, S., Park, C., Tkachev, S., and Ewing, R. C. Pressure-induced phase transitions of β-type pyrochlore CsTaWO6. United States: N. p., 2016. Web. doi:10.1039/c6ra11185h.
Zhang, F. X., Tracy, C. L., Shamblin, J., Palomares, R. I., Lang, M., Park, S., Park, C., Tkachev, S., & Ewing, R. C. Pressure-induced phase transitions of β-type pyrochlore CsTaWO6. United States. doi:10.1039/c6ra11185h.
Zhang, F. X., Tracy, C. L., Shamblin, J., Palomares, R. I., Lang, M., Park, S., Park, C., Tkachev, S., and Ewing, R. C. Fri . "Pressure-induced phase transitions of β-type pyrochlore CsTaWO6". United States. doi:10.1039/c6ra11185h. https://www.osti.gov/servlets/purl/1329475.
@article{osti_1329475,
title = {Pressure-induced phase transitions of β-type pyrochlore CsTaWO6},
author = {Zhang, F. X. and Tracy, C. L. and Shamblin, J. and Palomares, R. I. and Lang, M. and Park, S. and Park, C. and Tkachev, S. and Ewing, R. C.},
abstractNote = {The β-type pyrochlore CsTaWO6 was studied by synchrotron X-ray diffraction (XRD) and Raman scattering methods up to pressures of 43 GPa using a diamond anvil cell (DAC). With increasing pressure, the cubic pyrochlore in space group of Fd-3¯m with combining macron]m transforms to an orthorhombic structure (space group: Pnma) at 5.9 GPa and then to a monoclinic structure (space group: P21/c) at ~18 GPa. The structural evolution in CsTaWO6 is a continuous process and experimental results suggest that the initial cubic phase has a tetragonal distortion at ambient conditions. Both XRD and Raman measurements indicate that the pressure-induced phase transitions in CsTaWO6 are reversible. Lastly, these results may provide a structural explanation of previous experimental resistivity measurement results for the isostructural superconductor K(Cs)Os2O6 at high pressure conditions.},
doi = {10.1039/c6ra11185h},
journal = {RSC Advances},
number = 97,
volume = 6,
place = {United States},
year = {2016},
month = {9}
}

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