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The concentration dependence of the ferroelectric transition temperature Tc of single crystals of the solid solution Tris-sarcosine calcium chloride1-x bromidex is studied experimentally by measurement of the static dielectric constant εb and described by the empirical relation Tc(x) = Tc(0) (1 x/xcc)1/2. The Ising model with transverse field and the model of coupled anharmonic oscillators are used to explain the concentration dependence of the transition temperature Tc. The influence of quantum fluctuations is discussed.
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Windsch et al. (1983) studied this question.
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