Abstract
To identify the ionic conductivity mechanism of -substituted , an ion dynamic study on these substituted materials has been performed. Although the ionic conductivity and mechanism of conduction has already been reported, the ion dynamic study of these materials has scarcely been carried out to establish the conduction mechanism. The frequency dependence of ac conductivity of -doped has been explained by means of frequency dispersion of conductivity as well as in terms of modulus formalism. The values of the exponential parameter of the universal dielectric response and the stretching exponent β of the Kohlrausch–Williams–Watts relation are evaluated from curve fitting. Temperature dependence of such parameters is checked and is interpreted for the plausible mechanism of ionic motion in the material at low temperature. The scaling behavior of these materials are also studied to evaluate the composition and temperature dependence of the conduction mechanism.
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