Abstract
The Sr1−x La x Fe12−x Ni x O19 (x = 0−0.35) hexaferrites with 3 wt% Bi2O3 additive were prepared by microwave sintering method at 870 °C. Crystal structure, microstructure, magnetic, electrical, and dielectric properties of these low temperature sintered ferrites were investigated. The results show that the pure M-type phase is obtained for the ferrites with 0≤ x ≤0.25. With further increasing substitution amount, the multiphase structure is inevitably formed, and the LaFeO3 phase coexists with the M-type phase. In single M-type phase region, the variation of magnetic properties with La3+–Ni2+ substitution amount can be well explained based on the occupancy effects of La3+ and Ni2+ in magnetoplumbite structure. Besides, the electrical transport and polarization behaviors of the ferrites are clearly discussed. It suggests that the appropriate La3+–Ni2+ substitution (x = 0.2) improves their intrinsic magnetic and electrical properties for applying in nonreciprocal low temperature co-fired ferrite (LTCF) devices.
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Acknowledgements
This work is supported by the National Natural Science Foundation of China under Grant No. 51502025, the Project of Science and Technology Supporting Plan in Sichuan Province of China under Grant No. 2016GZ0108, and the Open Fund of Sichuan Province Key Laboratory of Information Materials and Devices Application under Grant No. 2015Z001.
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Peng, L., Li, L. Magnetic, electrical and dielectric properties of microwave sintered Sr1−x La x Fe12−x Ni x O19 (x = 0−0.35) hexaferrites used for nonreciprocal LTCF devices. J Mater Sci: Mater Electron 28, 17816–17826 (2017). https://doi.org/10.1007/s10854-017-7722-8
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DOI: https://doi.org/10.1007/s10854-017-7722-8