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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