Pressure-induced phase transitions of β-type pyrochlore CsTaWO6

Zhang, F. X.; Tracy, C. L.; Shamblin, J.; Palomares, R. I.; Lang, M.; Park, S.; Park, C.; Tkachev, S.; Ewing, R. C.

doi:10.1039/c6ra11185h

Pressure-induced phase transitions of β-type pyrochlore CsTaWO₆

Journal Article · Fri Sep 30 00:00:00 EDT 2016 · RSC Advances

DOI:https://doi.org/10.1039/c6ra11185h· OSTI ID:1329475

Zhang, F. X. ^[1]; Tracy, C. L. ^[2]; Shamblin, J. ^[3]; Palomares, R. I. ^[3]; Lang, M. ^[3]; Park, S. ^[2]; Park, C. ^[4]; Tkachev, S. ^[5]; Ewing, R. C. ^[2]

Univ. of Michigan, Ann Arbor, MI (United States); Oak Ridge National Laboratory
Stanford Univ., Stanford, CA (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Carnegie Institution of Washington, Washington, D.C. (United States)
Univ. of Chicago, Chicago, IL (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Carnegie Institution of Washington, Washington, D.C. (United States); Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0001977; NA0002006

OSTI ID:: 1329475

Journal Information:: RSC Advances, Journal Name: RSC Advances Journal Issue: 97 Vol. 6; ISSN 2046-2069; ISSN RSCACL

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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