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Journal of Alloys and Compounds, Volume 546, 5 January 2013, Pages 234-238.
Wenjie Zhang, Yang Bai, Xi Han, Liang Wang, Xuefei Lu, Lijie Qiao
Key Laboratory of Environmental Fracture (Ministry of Education), Advanced Material and Technology Institute, University of Science and Technology Beijing, Beijing 100083, China
Abstract
This paper demonstrated the magnetic properties of Co–Ti substituted M-type hexaferrite of Ba(CoTi)xFe12–2xO19 (x = 0.9–1.4), which was prepared by the solid-state reaction method. The single-phased M-type hexaferrite was obtained at 1050 °C, and the samples could be sintered well at 1200 °C. Co–Ti substitution reduces both saturation magnetization and coercivity of M-type hexaferrite, and gradually turns the magnetocrystalline anisotropy from uniaxial to planar within the composition range of x = 0.9–1.2. Whenx ⩾ 1.1, the samples have a good soft magnetic property with low coercivity and they exhibit high permeability in very high frequency range. Among them, the x = 1.2 sample has the best magnetic property with both high permeability of u′ = 40 and high cut-off frequency of 300 MHz.
