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Abstract
Y2/3Cu3Ti4O12 (YCTO) ceramics were sintered in air (YCTO-air) and pure O2 atmosphere (YCTO-O2), respectively. It was found that the permittivity and dielectric loss of YCTO-O2 were decreased drastically in low frequency. The frequency dependent impedance (Z″) and modulus (M″) spectra of YCTO-air and YCTO-O2 show a thermal activated process. The scaling behavior of both Z″ and M″ spectra further suggest that the distribution of relaxation times is temperature independent. The Cole–Cole plot in impedance formalism shows that electrical response of the samples originates from both grains and grain-boundaries. Conductivity (σ′) spectra follow Universal Dielectric Repose law. The short-range translation hopping assisted by small polaron hopping mechanisms for YCTO-O2. Moreover, the scaling behavior of σ′ spectra further confirms that the distribution of local electrical response time is temperature independent.
Published Version
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