Issue 30, 2015

A new, layered monoclinic phase of Co3O4 at high pressure

Abstract

We present the crystal structures and electronic properties of a Co3O4 spinel under high pressure. Co3O4 undergoes a first-order transition from a cubic (CB) Fd[3 with combining macron]m to a lower-symmetry monoclinic (MC) P21/c phase at 35 GPa, occurring after the local high-spin to low-spin phase transition. The high-pressure phase exhibits the octahedral coordination of Co(II) and Co(III), whereas the CB phase contains the fourfold coordination of Co(II) and the sixfold coordination of Co(III). The CB-to-MC transition is attributed to the charge-transfer between the di- and trivalent cations via the enhanced 3d–3d interactions.

Graphical abstract: A new, layered monoclinic phase of Co3O4 at high pressure

Article information

Article type
Paper
Submitted
14 Apr 2015
Accepted
29 Jun 2015
First published
01 Jul 2015

Phys. Chem. Chem. Phys., 2015,17, 19957-19961

Author version available

A new, layered monoclinic phase of Co3O4 at high pressure

T. Kaewmaraya, W. Luo, X. Yang, P. Panigrahi and R. Ahuja, Phys. Chem. Chem. Phys., 2015, 17, 19957 DOI: 10.1039/C5CP02126J

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