“Coupled soft modes and double triple points in ferroelectrics”

Abstract P-T diagrams for ferroelectrica of the displacement type are constructed based on the coupling of two or more soft modes of the lattice. They are compared with experimental phase diagrams. Typical are in particular triple points and sequences of triple points. This one also finds in purely elastically instable systems, suggesting that the construction principle offered has actually a broader basis. Also, a generalisation of the method such as to include phase transitions of the first kind is possible.

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