Abstract
Temperature (220 to 280 K) and frequency (0.02 to 1000 kHz) dependences of the real (e') and imaginary (e) parts of the complex electric permittivity for the ferroelectric b-cut of NH 4 HSeO 4 crystal have been investigated. The analysis of the experimental results has shown that the effective clastic stiffness coefficient C ell of the crystal decreases about three to four times in the temperature range of 256 to 262 K when compared to the paraelectric phase. Small oscillations of the temperature dependence of e(T) have been revealed in the temperature range of the incommensu rate phase (252 to 265 K), which have been interpreted as break off in the continuous change of the wave vector of the crystal structure caused by numerous transitions between commensurate and incommensurate subphases.
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