Pressure-induced symmetry breaking in tetragonal CsAuI3

Shibing Wang; Shigeto Hirai; Maxwell C. Shapiro; Scott C. Riggs; Theodore H. Geballe; Wendy L. Mao; Ian R. Fisher

doi:10.1103/PhysRevB.87.054104

Pressure-induced symmetry breaking in tetragonal CsAuI3

Strongly Correlated Electrons 2013-02-07 v2 Materials Science

Authors: Shibing Wang , Shigeto Hirai , Maxwell C. Shapiro , Scott C. Riggs , Theodore H. Geballe , Wendy L. Mao , Ian R. Fisher

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Abstract

Results of in situ high pressure x-ray powder diffraction on the mixed valence compound Cs2Au(I)Au(III)I6 (CsAuI3) are reported, for pressures up to 21 GPa in a diamond anvil cell under hydrostatic conditions. We find a reversible pressure-induced tetragonal to orthorhombic structural transition at 5.5-6 GPa, and reversible amorphization at 12-14 GPa. Two alternative structures are proposed for the high-pressure orthorhombic phase, and are discussed in the context of a possible Au valence transition.

Keywords

high pressure x-ray diffraction csauI3 mixed valence compound symmetry breaking tetragonal to orthorombic transition amorphization gold valence transition

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@article{arxiv.1205.1077,
  title  = {Pressure-induced symmetry breaking in tetragonal CsAuI3},
  author = {Shibing Wang and Shigeto Hirai and Maxwell C. Shapiro and Scott C. Riggs and Theodore H. Geballe and Wendy L. Mao and Ian R. Fisher},
  journal= {arXiv preprint arXiv:1205.1077},
  year   = {2013}
}

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Pressure-induced symmetry breaking in tetragonal CsAuI3

Abstract

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