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- W2890462162 abstract "Pure and modified CaCu3Ti4O12 with nominal compositions Ca0.95La0.05Cu3-xZnxTi4O12 (x = 0.01, 0.025, 0.05, 0.10) were synthesized using conventional solid state reaction route. The preliminary pure phase formation of all prepared CaCu3Ti4O12 compositions was confirmed by X-ray diffraction data and further analyzed by Rietveld refinement method. The grain size was found to be remarkably decreased from 15 µm to 3–4 µm on Zn2+ substitution in CCTO lattice. Dielectric spectra shows the presence of two relaxation processes corresponds to grain boundaries and grains in low and high frequency regions. The grain relaxation is more predominating over GBs relaxation process and found to be merged together for Zn rich compositions. The frequency response of ε' for doped compositions were found to be different from pure CaCu3Ti4O12. The dielectric permittivity (ε') values are significantly decreased for doped compositions, but Zn rich (5–10%) compositions still exhibit high ε' (~ 8102) and low dielectric loss (tan δ ≤ 0.10) over a wide range of frequency (102–106 Hz). Impedance measurement revealed that grain resistance enhanced with enhancement in Zn content to CaCu3Ti4O12 lattice and approached to grain boundary resistances. The overlapping of grain and grain boundary relaxation processes for Zn rich compositions attributed to the similar relaxation times of both contributions and indentified by Modulus analysis. Both formalism suggested that the electrical microstructure destroyed the Internal barrier layer capacitor (IBLC) formation that produces high dielectric permittivity in CaCu3Ti4O12 ceramic." @default.
- W2890462162 created "2018-09-27" @default.
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- W2890462162 date "2018-12-01" @default.
- W2890462162 modified "2023-10-16" @default.
- W2890462162 title "Dielectric and impedance studies of La and Zn co-doped complex perovskite CaCu3Ti4O12 ceramic" @default.
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- W2890462162 doi "https://doi.org/10.1016/j.ceramint.2018.09.121" @default.
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