A possible generalization of the phenomenological theory of phase transitions in type II ferroelectrics with incommensurate phase

作者：Korda V Yu^*; Berezovsky S V; Molev A S; Korda L P; Klepikov V F

来源：Physica B: Condensed Matter , 2012, 407(17): 3388-3393.

DOI：10.1016/j.physb.2012.04.043

• Phase transitions
• Incommensurate phase
• Ferroelectrics

We develop a generalized phenomenological theory of the paraelectric - incommensurate - commensurate phase transitions in type II ferroelectrics. The linear temperature dependence of the sixth-power term coefficient in the thermodynamic potential expansion is proposed. Contrary to the pre-existing theoretical approaches, the developed model eliminates a number of long-standing problems in the theory of type II ferroelectrics and can provide a correct description of the experimental data on the temperature dependence of the properties of type II ferroelectrics in the incommensurate phase.

• 出版日期2012-9-1