Abstract
The results of low-temperature linear and nonlinear susceptibilities and polarization measurements of the KLT-4.3%Li crystalline sample are presented. The following model of the mechanism of the ferroelectricity in the K0.957Li0.043TaO3 (KLT-4.3%Li) solid solution is proposed. Static quasi-frozen clusters of Li+ dipoles affect the ordering process of the remainder of the system: a dynamical correlation of the off-center motions of Ta ions along one of the equivalent off-center sites in the 〈111〉 cubic direction in the octahedral environment of O ions occurs and leads to the formation of a reversible spontaneous polarization.
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