Pressure-induced symmetry breaking in tetragonal CsAuI3

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.

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References in corpus (2)

• Single crystal growth by self-flux method of the mixed valence gold halides Cs${}_2$[Au${}^I$X${}_2$][Au${}^{III}$X${}_4$] (X=Br,I)
• Short small-polaron lifetime in the mixed-valence perovskite Cs${}_2$Au${}_2$I${}_6$ from high-pressure pump-probe experiments

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