Abstract
The temperature dependences of thermal conduction coefficient λ for the Sn2P2S6 and Sn2P2Se6 crystals have been studied in the vicinity of the structural phase transitions (PT) by means of a stationary longitudinal heat flux method. λ(T) behaviour in these crystals close to PT has been simulated numerically with allowance made for the inelastic and quasielastic scattering of heat-carrying phonons by the critical optical phonons and the contribution of the soft optical phonons to the heat transfer. It has been suggested that the anomalies in λ(T) at PT are specified primarily by the ratio of the heat capacity anomalies and the average group velocity anomalies.
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