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Using the proton-lattice coupled mode model containing anharmonicities, the deuteration dependent Curie constant, Curie temperature, dielectric constant and soft mode character of KDP-DKDP crystals have been studied. From fitting the experimental data it has been observed that for the mixed system various important parameters of the model can be expressed in terms of the corresponding parameters of purely hydrogenated and purely deuterated crystals. Present calculations also support the importance of the pure pseudospin tunnelling model.
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Chaudhuri et al. (1978) studied this question.
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