Abstract
Intercalation of gallium and indium selenide crystals by nickel initiates their electret polarization. The effect manifests itself at small concentrations of the intercalant. Temperature dependences of dielectric permittivity for both crystals demonstrate peaks in the same region of concentration. The effect is presumably connected with the ordering of local quasi-dipoles caused by the redistribution of intercalant atoms between octahedral and two tetrahedral positions. It is shown that a microscopic four-state model is able to reproduce a peak-like behaviour of the polarization at change of the intercalant chemical potential (concentration) and peculiarities of temperature dependences of the transverse dielectric susceptibility.
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