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A new permanent magnet material: Modified Ca ferrite

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3 Author(s)
Yamamoto, H. ; Meiji University, Kawasaki, Japan. ; Kawaguchi, Toranosuke ; Nagakura, M.

An experiment was carried out to investigate the preparation condition of anisotropic Ca system ferrite magnets with optimum magnetic and physical properties. Compositions were chosen according to the formula (CaO.nFe2O3)100-x(La2O3)x, where x was varied between 0 and 4.0, and n between 5.5 and 6.25. The optimum condition of making magnets and some properties of a typical specimen are as follows. The preparation condition: composition (CaO.6Fe2O3)97(La2O3)3, semisintering condition 1250°C × 1 h in O2gas, sintering condition 1275°C × 0.5 h in O2gas. Magnetic properties: 4\pi I_{10 \hbox{ } k} = 4200 G, 4πIr = 4100 G,IHC= 2100 Oe,BHC= 2050 Oe, (BH)_{\max } = 3.5 MG . Oe, Ku = 3.34 × 106erg/cc, HA= 20.5 kOe, \sigma _{s} = 64.8 emu/g, Tc = 446°C.

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Magnetics, IEEE Transactions on  (Volume:15 ,  Issue: 4 )