Abstract
The specific features of structural transformations in lanthanum manganite and lithium niobate are analyzed in terms of the macrosymmetry conservation principle discussed in the papers by L.A. Shuvalov. The possible mechanisms of phase transformations are proposed reasoning from a sequence of structural transitions, including the restoration of a virtual configuration of cubic perovskite with double the lattice parameter. The basic scheme of mutual transformations of two orthorhombic modifications is described for lanthanum manganite. A similar scheme proposed for lithium niobate is used to elucidate the nature of the mechanical twinning observed upon mutual switching of orientational domains.
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