Pressure-induced phase transitions of β-type pyrochlore CsTaWO6

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

doi:10.1039/C6RA11185H

Pressure-induced phase transitions of β-type pyrochlore CsTaWO₆†

F. X. Zhang,*^a C. L. Tracy,^b J. Shamblin,

^c R. I. Palomares,^c M. Lang,^c S. Park,^b C. Park,

^d S. Tkachev^e and R. C. Ewing^b

Author affiliations

* Corresponding authors

^a Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA
E-mail: zhangfx@umich.edu

^b Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA

^c Department of Nuclear Engineering, University of Tennessee, Knoxville, TN 37996, USA

^d HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, IL 60439, USA

^e GSECARS, University of Chicago, IL 60439, USA

Abstract

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 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. These results may provide a structural explanation of previous experimental resistivity measurement results for the isostructural superconductor K(Cs)Os₂O₆ at high pressure conditions.

Article information

https://doi.org/10.1039/C6RA11185H

Article type

Paper

Submitted

16 May 2016

Accepted

18 Sep 2016

First published

30 Sep 2016

Download Citation

RSC Adv., 2016,6, 94287-94293

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Pressure-induced phase transitions of β-type pyrochlore CsTaWO₆

F. X. Zhang, C. L. Tracy, J. Shamblin, R. I. Palomares, M. Lang, S. Park, C. Park, S. Tkachev and R. C. Ewing, RSC Adv., 2016, 6, 94287 DOI: 10.1039/C6RA11185H

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