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Issue 23, 2007
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Orbital ordering in orthorhombic perovskites

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Abstract

In addition to a cooperative MO6/2 site rotation, orthorhombic AMO3 perovskites with Pbnm space group have a universal, intrinsic MO6/2 site distortion consisting of an orthorhombic component and a reduction from 90° of the O–M–O bond angle α that subtends the octahedral-site edges parallel to the orthorhombic b axis. RMO3 perovskites (R = rare earth or Y, M = 3d-block transition metal) exhibit a maximum intrinsic orthorhombic site distortion at an R3+-ion radius IR ≈ 1.11 Å and a reduction of α that increases with IR > 1.11 Å. How the universal site distortions influence Jahn–Teller cooperative orbital orderings on the M cations is illustrated in four orthorhombic perovskite families: RTiO3, RVO3, RMnO3, and RNiO3.

Graphical abstract: Orbital ordering in orthorhombic perovskites

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Article information


Submitted
05 Feb 2007
Accepted
12 Apr 2007
First published
23 Apr 2007

J. Mater. Chem., 2007,17, 2394-2405
Article type
Feature Article

Orbital ordering in orthorhombic perovskites

J. B. Goodenough and J.-S. Zhou, J. Mater. Chem., 2007, 17, 2394
DOI: 10.1039/B701805C

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