A Sublattice Model of Appearance of an Incommensurate Phase Sandwiched by Reentrant Commensurate Phases
1986 年 55 巻 12 号 p. 4309-4314
詳細
1986 年 55 巻 12 号 p. 4309-4314
A two-sublattice model is presented for reproducing the normal(N)-commensurate(C)-incommensurate(IC)-commensurate(C) phase sequence phenomenologically. The temperature dependences of the transition parameters representing the homogeneous ionic displacements and the incommensurate modulated structure are obtained. The temperature dependences of a lattice constant and the soft mode frequencies are also presented.
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