Dielectric relaxations in Tb0.91Yb1.38Bi0.71Fe5O12 ceramics |
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| Authors: | Y.J. Wu Y. Gao X.M. Chen S.Y. Wu Z.C. Xu |
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| Affiliation: | Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | Dielectric relaxations of Tb0.91Yb1.38Bi0.71Fe5O12 ceramics were investigated. A Debye-type relaxation was observed in the temperature range of 125-620 K with an activation energy of 0.29 eV. This activation energy agreed well with that of carriers hopping between Fe2+ and Fe3+, indicating that this relaxation might be a dipolar-type relaxation associated with the hopping carries. A high relaxorlike dielectric peak with a very strong frequency dispersion in the high temperature range of 400-620 K might be originate from the oxygen vacancies related dielectric relaxation. |
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| Keywords: | 77.22.Gm 81.05.Fw 77.84.-s |
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