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. 2016 Nov 14;9(11):921. doi: 10.3390/ma9110921

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© 2016 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Representation of (a) the perovskite oxide, ABO₃ (n = ∞ in the Ruddelsden-Popper system) and (b) the first-order (n = 1) Ruddlesden-Popper system A₂BO₄. O(1) and O(2) oxygen atoms are located at an apical site in rock salt and an equatorial site in perovskite layers, respectively.