Theory of the Transition from a Prototypic Phase to a Simultaneously Incomminsurate and Ferroelectric Phase
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Although the transition sequence [prototypic phase -+incommensurate non-ferroelectric phase -+commensurate ferroelectric phasel is more common, thetransition [prototypic phase +incommensurate ferroelectric phasel is also pos-sible. A thermodynamical theory of this transition is presented. AmmoniumRochelle salt is dealt with as an example. Not only the soft order parametershaving wavevector (] /2, 0, 0) for translational transformations, but also a hardorder parameter transformed like the (y, z) component of strain is taken intoaccount. Their cooperation is important. It is found that, if the coefficients in thefree energy function satisfy certain inequalities, the prototypic phase is changedto an incommensurate ferroelectric phase earlier than to any other ferroicphase.
- 社団法人日本物理学会の論文
- 1984-05-15
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