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- Title
Structural and magnetic properties of M-Ti (M = Ni or Zn) co-substituted M-type barium ferrite by a novel sintering process.
- Authors
Li, Jie; Zhang, Huaiwu; Liu, Yinong; Li, Qiang; Ma, Guokun; Yang, Hong
- Abstract
M (Ni or Zn) ion together with Ti ion were substituted for two trivalent Fe ions of M-type barium ferrite in the form of Ba(MTi)FeO (x = 0.30, 0.60, 0.90 and 1.20). Samples were prepared by solid state reaction and sintered by a novel process. The samples were sintered by the sintering process at a high temperature of 1175 °C for 6 h and slowly downed to 800 °C at a rate of 1 °C per 1 min, and then cooled in air. This process could control contract deformation of grains and effectively reduce the pore formation. Under the novel sintering process, with x = 0.30-1.20, co-substitution of M-Ti caused no change to the single phase M-type barium ferrite structure, and the samples exhibited more homogeneous microstructure. The bulk density ( ρ) increased with Zn-Ti contents, and the maximum density was 4.75 g/cm (x = 1.20), which was 89.7 % of theory density (5.29 g/cm). Magnetic properties such as saturation magnetization ( M) and coercivity ( H) decreased with increasing of M-Ti substituted contents. Magnetic permittivity increased first, and then decreased at different x content under Ni-Ti and Zn-Ti substitution.
- Subjects
SINTERING; MAGNETIC properties; BARIUM ferrite; SOLID state chemistry; MICROSTRUCTURE; COERCIVE fields (Electronics); MAGNETIZATION measurement
- Publication
Journal of Materials Science: Materials in Electronics, 2015, Vol 26, Issue 2, p1060
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-014-2505-y