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Dimensional crossover of correlated anion disorder in oxynitride perovskites

AuthorsJohnston, Hannah; Black, Ashley P. ; Kayser, Paula ; Oró, Judith ; Keen, David A.; Fuertes, Amparo ; Attfield, J. Paul
Issue Date21-May-2018
PublisherRoyal Society of Chemistry
CitationChemical Communications 54(41): 5245-5247 (2018)
AbstractA simple crossover from two-dimensional to three-dimensional correlated disorder of O and N atoms on a cubic lattice has been discovered within the Ba1xSrxTaO2N 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.
Publisher version (URL)http://dx.doi.org/10.1039/C8CC03462A
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