The diffuse phase transitions (DPT) in the ST-BT system are theoretically and experimentally justified by the coexistence of two phases (one tetragonal, the other cubic) in the temperature range of the transition. This fact is emphasized by X-ray identification of both phases at room temperature in (Ba0.76Sr0.24)TiO3 and (Ba0.715Sr0.285)TiO3 solid solutions. The ferroelectric-para-electric (F-P) and the lower ferroelectric transitions are discussed in terms of thermal phase equilibria in the F-P diagram proposed.
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Barb et al. (1982) studied this question.