Dimensional crossover of correlated anion disorder in oxynitride perovskites

• DOI: 10.1039/c8cc03462a
• Publication Date: 2018-05-01T08:34:47Z
• Authors: Hannah Johnston; Ashley P. Black; Paula Kayser; Judith Oró-Solé; David A. Keen; Amparo Fuertes; J. Paul Attfield
• Keywords: Ciencias; 23 Química; 01 natural sciences; 0104 chemical sciences

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 perovskite oxynitrides. The is driven by expansion as x decreases, provides rapid increase in entropy due change subextensive extensive configurational regimes.