Eight-potential-well order-disorder ferroelectric model and effects of random fields

Liu, Zhi-Rong; Zhi-Rong Liu; Gu, Bing-Lin; Bing-Lin Gu; Zhang, Xiao-Wen; Xiao-Wen Zhang
November 2000
Applied Physics Letters;11/20/2000, Vol. 77 Issue 21
Academic Journal
An eight-potential-well order-disorder ferroelectric model was presented and the phase transition was studied under the mean-field approximation. It was shown that the two-body interactions are able to account for the first-order and the second-order phase transitions. With increasing the random fields in the system, a first-order phase transition is transformed into a second-order phase transition, and furthermore, a second-order phase transition is inhibited. However, proper random fields can promote the spontaneous appearance of a first-order phase transition by increasing the overcooled temperature. The connections of the model with relaxors were discussed. © 2000 American Institute of Physics.


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