The cubic-tetragonal transformation driven by the elastic instability (C₁₁-C₁₂)→0 may be followed by further rearrangements in which c/a>1 changes to c/a<1 or vice versa. These transformations are investigated by Landau theory. Unlike the cubic-tetragonal transformation, which must be first order, the subsequent reordering may be either a single first-order transformation or involve two second-order transformations through an intervening orthorhombic phase. The three-phase boundaries terminated in a bicritical point. Examples of both types of behavior are discussed briefly.
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Axe et al. (1981) studied this question.
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