A phase of antiferroelectric type of hysteresis preceding the transition to the ferroelectric state has been observed in Thallium Indium sulfide crystals. A possible coexistence of polar regions and domains of the ferroelectric and the T C1 - T C2 phases over a wide range of temperature is suggested from analysis of dielectric studies. A metastable behaviour of permittivity observed at thermocycling is explained by existence of a chaotic state below the ferroelectric phase transition temperature T C2 = 201 K. A model of two polar sublattices in the region of phase coexistence in TlInS2 is offered.
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Salaev et al. (1992) studied this question.
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