Dimensional crossover of correlated anion disorder in oxynitride perovskites

Hannah Johnston, Ashley Phillip Black, Paula Kayser, Judith Oró-solé, David A. Keen, Amparo Fuertes, Paul Attfield

Research output: Contribution to journalArticlepeer-review


A simple crossover from two-dimensional to three-dimensional correlated disorder of O and N atoms on a cubic lattice has been discovered within the Ba1-xSrxTaO2N series of perovskite oxynitrides. The crossover is driven by lattice expansion as x decreases, and provides a rapid increase in entropy due to a change from subextensive to extensive configurational entropy regimes.
Original languageEnglish
JournalChemical Communications
Early online date1 May 2018
Publication statusE-pub ahead of print - 1 May 2018


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