Interpretations of the Sequence of Transitions in Barium Sodium Niobate, Ba_2NaNb_5O_<15>
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For the sequence of transitions in BSN, five interpretations are proposed. It is assumed that phase I that occurs above about 560℃ is prototypic and phases II and III are ferroics derived from phase I. The Prototyoic space group is almost doubtlessly P4/mbm. The soft mode system is assumed to consist of an A_<2u> zerowavenumber mode and two certain (degenerate or nondegenerate) modes with wavector (0, 0, 1/2). When the latter modes are degenerate, their appropriate transformation property is uniquely determinate and it is deduced that phase III should belong to space group Cmc2_1. When nondegenerate, four different pairs of appropriate transformation properties are conceivable for the pair of modes with wavevector (0, 0, 1/2). According to which of these four is assumed, phase III is deduced to belong to space group Cmm2 or Ccc2 and to be of n_F=2 or 3 for strain component x_6.
- 社団法人日本物理学会の論文
- 1976-09-15
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