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

Hayden A. Evans; Zeyu Deng; Ines E. Collings; Yue Wu; Jessica L. Andrews; Kartik Pilar; Joshua M. Tuffnell; Guang Wu; John Wang; Siân E. Dutton; Paul D. Bristowe; Ram Seshadri; Anthony K. Cheetham

doi:10.1039/C9CC00118B

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

Hayden A. Evans,

‡^ab Zeyu Deng,

‡^cd Ines E. Collings,

^e Yue Wu,

^c Jessica L. Andrews,^a Kartik Pilar,

^b Joshua M. Tuffnell,^f Guang Wu,^a John Wang,^c Siân E. Dutton,

^f Paul D. Bristowe,

^d Ram Seshadri

^abg and Anthony K. Cheetham

*^bcd

Author affiliations

* Corresponding authors

^a Department of Chemistry and Biochemistry, University of California Santa Barbara, California 93106, USA

^b Materials Research Laboratory, University of California Santa Barbara, California 93106, USA
E-mail: akc30@cam.ac.uk

^c Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore

^d Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Rd, CB3 0FS Cambridge, UK

^e European Synchrotron Radiation Facility, 71 avenue des Martyrs, 38000 Grenoble, France

^f Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, UK

^g Materials Department, University of California Santa Barbara, California 93106, USA

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.

This article is part of the themed collection: Perovskites

Chemical Communications

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

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

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