Abstract
Polycrystalline Er3Fe5O12 ceramic sample was synthesized by a solid-state reaction technique. The dielectric properties of the sample were experimentally studied. A colossal dielectric constant more than 103 was observed over a wide temperature and frequency range. The dielectric relaxation in the sample was identified by the measurement of permittivity modulus, impedance spectroscopy, and conductivity in detail. At relatively low temperatures (T < 600 K), the dielectric relaxation under high frequencies (f ≥ 50 kHz) is triggered by the dipolar effect accompanied by the Fe2+ and Fe3+ charge transitions, while that under low frequencies (f ≤ 50 kHz) is mainly be associated with the Maxwell–Wagner effect. Moreover, a low-frequency dielectric relaxation at high temperatures (T ≥ 600 K) is probably evolving from the contribution of oxygen vacancies and grain boundaries, which is also suggested to be the origin of the colossal dielectric constant.
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Acknowledgements
We warmly thank the National Natural Science Foundation of China (Grant Nos. 11474111 and 11604281) and the Nanhu Scholars Program of XYNU, China, for their financial support and the members of the Analysis Center of HUST for their cooperation in sample characterizations.
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Zheng, J., Fu, Q., Chen, X. et al. Colossal dielectric response in erbium iron garnet ceramics. J Mater Sci: Mater Electron 32, 290–298 (2021). https://doi.org/10.1007/s10854-020-04775-9
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DOI: https://doi.org/10.1007/s10854-020-04775-9