Abstract
A correlation between cationic valence deviation and ordering in B-site cations is found. Larger cationic valence deviation, leading to instabilities in the crystals, could be mutually compensated by chemical ordering of B':B=1:1. The larger valence deviation of B' and B cations, therefore, the higher ordering of B-site cations could be considered. This result corresponds to the fact that well-ordering structure has been obtained by a suitable thermal annealing in PST and PSN and nonordering structure observed in PFN.
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