期刊
JOURNAL OF COMPOSITE MATERIALS
卷 50, 期 2, 页码 173-178出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/0021998315571775
关键词
Magnetic materials; M-type barium ferrite; Ni-Ti co-substitution; composite; LTCC application; saturation magnetization; coercivity; ion occupancy
资金
- National Basic Research Program of China [2012CB933100]
- Chinese Scholarship Council
Divalent Ni2+ ion and tetravalent Ti4+ ion equiatomic co-substituted two trivalent Fe3+ ions of M-type barium ferrite in the form of Ba(NiTi)(x)Fe12-2xO19 with x=1.0, 1.1, 1.2, 1.3. The samples were prepared using solid state reaction route and added 2.5 wt% Bi2O3 to lower sintering temperature. The samples were sintered at 925? and 950? for 6h. As the Ni-Ti molar content changed from 1.0 to 1.3, all XRD patterns showed the single phase of the M-type barium ferrite without other intermediate phase. The microstructures were analyzed with scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The saturation magnetization M-s (49.74-29.58 emu/g) and the coercivity H-c (426.44-329.63 Oe) decreased with increasing Ni-Ti composition x and indicated that a decrease of magnetic moment and anisotropy was achieved by substitution of Ni-Ti. These properties attribute to Ni and Ti occupancies at different sites in the barium ferrite crystalline structure.
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