The dielectric and conduction behavior of La-doped SrTiO3 annealed in different atmospheres was studied. The results showed that the quantum-paraelectric behavior was purely suppressed by La doping. A variable-range-hopping conduction was observed for the samples annealed in a strongly reducing atmosphere, and subsequently an insulator-metal transition occurred. The possible correlation of the singular dielectric behavior and the electrical conduction behavior is pointed out. The validity of the Barrett relation derived from the mean-field theory for quantum paraelectrics is discussed.
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Zhi Yu (2002) studied this question.
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