Interpretations of the Sequence of Transitions in Barium Sodium Niobate, Ba 2 NaNb 5 O 15
作者： Kêitsiro Aizu
DOI: 10.1143/JPSJ.41.880
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摘要: For the sequence of transitions in BSN, five interpretations are proposed. It is assumed that phase I occurs above about 560°C prototypic and phases II III ferroics derived from I. The space group almost doubtlessly P 4/ m b . soft mode system to consist an A 2u zero-wavenumber two certain (degenerate or nondegenerate) modes with wavevector (0, 0, 1/2). When latter degenerate, their appropriate transformation property uniquely determinate it deduced should belong C c 2 1 nondegenerate, four different pairs properties conceivable for pair According which these assumed, be n F =2 3 strain component x 6
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