Abstract
Dielectric losses in triglycine selenate crystals were studied in the frequency range from 20 Hz to 1 MHz for several a.c. field amplitudes. The peculiar shape of the temperature dependence of the loss factor D = tan δ reflects the character of the phase transition, which is very close to tricritical. In the range from 20 Hz to 10 kHz the temperature behaviour of tanδ is described according to the model presented previously for TGS crystals, adapted to the TGSe, taking into account the specific features of the phase transition. A low and a higher frequency relaxation band in D vs. frequency were found and a dip in D was noticed in the range of a few kHz for several temperatures near and below T C. The relaxation frequency attributed to domain wall motion increased rapidly, reached a maximum around 3 K below T C' and then dropped in relative value toward lower temperatures, as it has been observed in other ferroelectric transitions.
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