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Issue 28, 2010
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Cation ordering in perovskites

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Although both A- and B-site cations have the same simple cubic topology in the perovskite structure they typically adopt different patterns of chemical order. As a general rule B-site cations order more readily than A-site cations. When cation ordering does occur, rock salt ordering of B/B′ cations is favored in A2BBX6 perovskites, whereas layered ordering of A/A′ cations is favored in AAB2X6 and AABBX6 perovskites. The unexpected tendency for A-site cations to order into layers stems from the bond strains that would result at the anion site if A and A′ cations of different size were to order with a rock salt arrangement. The bonding instabilities that are created by layered ordering are generally offset either by anion vacancies or second order Jahn–Teller distortions of a B-site cation. Novel types of A-site cation ordering can be stabilized by a+a+a+ or a+a+c tilting of the octahedra.

Graphical abstract: Cation ordering in perovskites

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Publication details

The article was received on 21 Dec 2009, accepted on 04 Mar 2010 and first published on 15 Apr 2010

Article type: Feature Article
DOI: 10.1039/B926757C
Citation: J. Mater. Chem., 2010,20, 5785-5796
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    Cation ordering in perovskites

    G. King and P. M. Woodward, J. Mater. Chem., 2010, 20, 5785
    DOI: 10.1039/B926757C

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