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(a) DTA of calcined samples in air: (1) undoped , (2) . (b) Thermal expansion characteristics of the sintered sample: (1) undoped , (2) .
Room temperature XRD patterns of (a) undoped and (b) Rietveld refinement plot for .
A typical complex impedance plot of the sintered sample at in air; solid line is the fitting result obtained with equivalent circuits (bottom) and the frequency dependence of the imaginary part of complex impedance in air (top).
Arrhenius plots of the electrical conductivity of sintered sample in different atmospheres along with that of the undoped material in air.
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