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Polymorphism in M(H2PO2)3 (M = V, Al, Ga) compounds with the perovskite-related ReO3 structure

last modified Feb 18, 2019 05:30 PM

Polymorphism in M(H2PO2)3 (M = V, Al, Ga) compounds with the perovskite-related ReO3 structure

Hayden Evans, Zeyu Deng, Ines Collings, Yue Wu, Jessica L Andrews, Kartik Pilar, Joshua Mark Tuffnell, Guang Wu, John Wang, S E E Dutton, Paul D Bristowe, Ram Seshadri, and Anthony K Cheetham

18th February 2019

Abstract

Trivalent metal hypophosphites with the general formula M(H2PO2)3 (M = V, Al, Ga) adopt the ReO3 structure, with each compound displaying two structural polymorphs. High-pressure synchrotron X-ray studies reveal a pressure-driven phase transition in Ga(H2PO2)3 that can be understood on the basis of ab initio thermodynamics.