Anomalous properties of crystals with ferroelectric phase transition induced by off-center ions |
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Authors: | BE Vugmeister MD Glinchuk |
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Institution: | 1. Institute for Materials Sciences, Academy of Sciences of the Ukrainian SSR, 252180 Kiev, U.S.S.R. |
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Abstract: | It is given the theoretical study of some properties of strongly polarizable dielectric crystals in which off-center impurity ions induce ferroelectric phase transition. The spontaneous polarization, transition temperature, soft mode frequency, dielectric susceptibility, ultrasonic attenuation, nuclear spin-lattice relaxation are analyzed. The theory explains observed in K1?xLixTaO3 saturation of remanent polarization with off-center Li+ concentration increasing, close to dependence of phase transition temperature, the anisotropy of ultrasonic attenuation, the absence of anomalies of Li nuclear spin-lattice relaxation rate near Tc. |
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