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- W2103308412 abstract "The X-ray diffraction Rietveld refinement of Ba[(Fe1−xCox)1/2Nb1/2]O3 with 0 ≤ X ≤ 1 shows cubic structure formation with space group Pm3m. No distinct tilting of oxygen octahedron is observed. The dielectric measurement of such a cubic system exhibited giant values (ɛ′ > 104) in the temperature range of 298–483 K and frequency range of 102–105 Hz. An analysis of the permittivity, electric modulus, and electrical conductivity properties in these systems confirmed the presence of oxygen vacancies induced dipolar relaxation. Our investigations show that the observed extremely high dielectric constant values are predominantly the result of oxygen vacancies induced dipoles produced at the grain boundaries. Additional significant intrinsic contributions to the permittivity comes from the directly doped electrons at the unit cell, as indicated by the enhancement in the observed values of the permittivity on replacement of Fe3+ (3d5) by Co3+ (3d6). The contributions of the doped free charges and the oxygen vacancy induced dipoles are separated using the Jump Relaxation Model." @default.
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- W2103308412 date "2011-02-01" @default.
- W2103308412 modified "2023-09-24" @default.
- W2103308412 title "Origin of giant dielectric constant in Ba[(Fe1−xCox)1/2Nb1/2]O3" @default.
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- W2103308412 doi "https://doi.org/10.1016/j.jallcom.2010.10.045" @default.
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