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• W2039807265 abstract "Single phase perovskite CaTiO 3 has been synthesized by conventional solid state reaction technique. The ceramic was characterized by XRD at room temperature and its Rietveld refinement inferred orthorhombic crystal structure with the space group Pbnm. The field dependence of dielectric relaxation and conductivity was measured over a wide frequency range from room temperature to 673 K. Analysis of Nyquist plots of CaTiO 3 revealed the contribution of many electrically active regions corresponding to bulk mechanism, distribution of grain boundaries and electrode processes. The dc conductivity depicted a semiconductor to metal type transition. Frequency dependence of dielectric constant (ε′) and tangent loss (tan δ ) show a dispersive behavior at low frequencies and is explained on basis of Maxwell-Wagner model and Koop's theory. Both conductivity and electric modulus formalisms have been employed to study the relaxation dynamics of charge carriers. The variation of ac conductivity with frequency at different temperatures obeys the universal Jonscher's power law ( σ ac α ω s ). The values of exponent ‘s’ lie in the range 0.13 ≤ s ≤ 0.33, which in light of CBH model suggest a large polaron hopping type of conduction mechanism. ► Rietveld refinement of CaTiO 3 showed orthorhombic symmetry with Pbnm space group. ► Three different electrically active regions were depicted from Nyquist plots. ► Thermosensitive electrical behavior was observed in Nyquist plots. ► A semiconductor to metal type transition was inferred in present system. ► CBH model suggests that conduction takes place through large polaron hopping." @default.
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• W2039807265 date "2012-11-01" @default.
• W2039807265 modified "2023-10-03" @default.
• W2039807265 title "Rietveld refinement and impedance spectroscopy of calcium titanate" @default.
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• W2039807265 doi "https://doi.org/10.1016/j.cap.2012.03.034" @default.
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