Hannah Johnston, Ashley P. Black, Paula Kayser, Judith Oró-Solé, David A. Keen, Amparo Fuertes* and J. Paul Attfield*. Chem. Commun., 2018,54, 5245-5247 . DOI:10.1039/C8CC03462A
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.
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