P–T phase diagram and Au valence state of the perovskite-type Au mixed-valence complexes M2[AuIX2][AuIIIX4] (M=K, Rb, Cs; X=Cl, Br, I)
2000; Elsevier BV; Volume: 198; Issue: 1 Linguagem: Inglês
10.1016/s0010-8545(99)00195-2
ISSN1873-3840
AutoresNobuhiko Kojima, Nobuyuki Matsushita,
Tópico(s)Magnetism in coordination complexes
ResumoM2[AuIX2][AuIIIX4] (M=K, Rb, Cs; X=Cl, Br, I) are perovskite-type gold mixed-valence complexes. In this review, we describe their structural P–T phase diagram, the pressure induced Au valence transition from the AuI, III state to the AuII one, which is coupled with a structural phase transition. The metallic cubic phase appearing under high pressure and high temperature can be obtained as a metastable phase even at ambient pressure and room temperature. In the pressure region below the Au valence transition, Cs2[AuIX2][AuIIIX4] (X=Cl, Br, I) show metallic behavior, which is attributed to the Au valence-fluctuation.
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