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SCIENTIFIC HIGHLIGHTS

Dimensional crossover of correlated anion disorder in oxynitride perovskites
15 June 2018

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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Oxides for new-generation electronics

Dimensional crossover of correlated anion disorder in oxynitride perovskites