The temperature dependence of the complex dielectric constant in K(H1−xDx)2PO4 with x = 0.64 and 0.86 is determined at ω = 4.62 cm−1 (λ = 2.16 mm) for E parallel and transverse to the ferroelectric axis c by measurements of the complex amplitude reflection coefficient using a Michelson interferometer. For E ‖ c the temperature dependence is due to a low frequency mode with a characteristic frequency below 6 cm−1. Apart from the vicinity of TC the data can reasonably be described with a Debye model. For E ⟂ c the results indicate a temperature dependent transverse protonic mode between 5 and 10 cm−1. ϵ″ shows a sharp anomalous peak at TC.
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Gauss et al. (1976) studied this question.