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Dimensional crossover of correlated anion disorder in oxynitride perovskites
Hannah Johnston1, Ashley P Black, Paula Kayser
1CSEC and School of Chemistry, University of Edinburgh, King's Buildings, Mayfield Road, Edinburgh, EH9 3JZ, UK. j.p.attfield@ed.ac.uk.
Abstract:
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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