Abstract
Dielectric spectroscopy data in the frequency range 100 Hz-10 MHz are presented for two kinds of Rb 2 ZnCl 4 crystals, purified and standard quality, with special attention to the lock-in ferroelectric phase (C phase). It is shown that unlike standard-quality samples, the persittivity e tail extends deep into the C phase of purified crystals and is an almost unambiguous function of temperature. The e(T) dependence and its dispersion properties show that the temperature region below the incommensurate (IC) phase can be divided into four sections. On cooling, the first-order transformation takes place within the interval 4 T, in which de/dT<0 and the relaxation frequency drops by almost two orders of magnitude
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