Abstract
The temperature dependence of specific heat at constant pressure, Cp(T), has been measured for lithium sodium sulphate, LiNaSo 4 crystals, at different γ-radiation doses and external bias electric field (E b ), in the temperature range 300-900 K. A nonlinear dependence of transition temperature, T 1 and a remarkable change in the thermodynamic parameters, were obtained as the effect of both electric field and γ-radiation. The effect of γ-radiation doses on the phase transition in LiNaSO 4 crystals was explained as due to an internal bias field, E b, originating from the interaction of polar defects with the order parameter of the host lattice. The internal bias field effect on the behaviour of Cp(T) in LiNaSO 4 crystals was similar to that of the external electric field (E).
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