Tb3-xBixFe5O12石榴石之介電與磁性研究

蔡秉均

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Tb3-xBixFe5O12石榴石之介電與磁性研究

Study on dielectric and magnetic properties of Tb3-xBixFe5O12

蔡秉均 , Masters　　Advisor：齊孝定　　

英文

铽鐵石榴石；介電行為；鐵氧體磁性； Cole-Cole ； Terbium iron garnet ； Dielectric behavior ； Ferrimagnetism ； Cole-Cole

Abstract │ Reference (49) │ Altmetrics

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Tb3Fe5O12 showed a large magnetodielectric response at a low field (1-2 kOe). Therefore, it is more promising for practical applications than the multiferroics in which the magnetoelectric coupling only occurred under high field (>1 Tesla). As one of the members of the rare-earth iron garnets, the magnetic properties of Tb3Fe5O12 have been studied extensively, but there is little known about its dielectric properties. In this work, Tb3-xBixFe5O12 (x=0.0-1.0) samples were prepared by the solid-state reaction method at 10001390 °C and their dielectric and magnetic properties were studied in detail. The results revealed that sintering temperature and Bi substitution affected dramatically the density and dielectric behaviors of Tb3Fe5O12, while sintering temperature did not change notably the magnetic properties. Higher sintering temperature resulted in an increase in density, dielectric constant and loss-peak frequency, but a decrease in the α parameter of the Cole-Cole equation. The Fe2+/Fe3+ hopping process was proposed for the observed dielectric behaviors. On the other hand, Bi substitution led to an increase in density and hopping activation energy, but a decrease in sintering temperature, dielectric responses, and the contribution of the Tb3+ magnetic sub-lattice. The intermediate temperature dielectric relaxation may result from the Bi2+/Bi3+ hopping process. The dielectric behaviors were analyzed by using the Cole-Cole method and Arrhenius laws. In addition, magnetic properties were consistent with the reports in the literature.

Reference ( 49 ) 〈TOP〉

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連結：
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連結：
[5] M. Fiebig, Revival of the magnetoelectric effect, Journal of Physics D: Applied Physics, 38 (2005) R123-R152.
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