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Impedance spectra were measured for two types of lanthanum-substituted PbWO 4 systems (Pb 1−x La 2x/3 WO 4 and Pb 1−x La x WO 4+x/2 ), from which the relaxation phenomena associated with oxide ion conduction were investigated. Profiles of the imaginary part of the electric modulus normalized at the peak position were not essentially varied with...
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