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A New Type of the Ferroelectric Phase Transition
Author(s) -
Holakovský J.
Publication year - 1973
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220560224
Subject(s) - ferroelectricity , phase transition , condensed matter physics , ferroics , instability , materials science , phase (matter) , quantum phase transition , physics , quantum critical point , quantum mechanics , optoelectronics , dielectric
It, is suggested that a ferroelectric phase transition could be triggered by an instability of the crystal with respect to another phase transition parameter η. The spontaneous polarization P and spontaneous η may occur either successively or simultaneously (at the same temperature), the latter case being always a first order phase transition. The necessary condition for the existence of a triggered ferroelectric phase transition (TFT) is that η 2 P 2 is the lowest order interaction term in the free energy expansion. The symmetry change due to TFT is discussed.