Dimensional crossover of correlated anion disorder in oxynitride perovskites

Chem. Commun.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.

Oxides for new-generation electronics

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