Potts model and phase transition in lead phosphate Pb3(PO4)2
- 27 November 1981
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 14 (33) , L1029-L1035
- https://doi.org/10.1088/0022-3719/14/33/001
Abstract
An attempt is made to explain the first-order phase transition (180.4 degrees C) and the presence of an intermediate phase (180.4 degrees C-300 degrees C) between the para- and ferro-phases in lead phosphate, Pb3(PO4)2, by invoking the basic ideas of the three-dimensional renormalised Potts model. This involves the introduction of three order parameters with two different critical temperatures. A relaxational type flip mode is proposed as the driving soft mode. The abnormal behaviour of the spontaneous strain between 160 degrees C and 180 degrees C, as well as the anomalous behaviour of the elastic stiffness constants C11 and C22 during the phase transition, are explained.Keywords
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