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

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.
 [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:
Grant/Contract Number:
NA0001977; NA0002006
Accepted Manuscript
Journal Name:
RSC Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 97; Journal ID: ISSN 2046-2069
Royal Society of Chemistry
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)
Country of Publication:
United States
OSTI Identifier: