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Experiments were carried out to investigate the effect of Na2O addition after semisintering treatment on magnetic properties of anisotropic BaO2ZnO8Fe2O3 magnets. It was found that the magnetic properties of Ba-Zn system W-type ferrite were improved by the addition of Na2O after semesintering treatment. The optimum condition of making magnets and some properties of typical specimens are as follows : composition BaO⋅2ZnO⋅8Fc2O3 in addition with 1.5wt% Na2O ; semisintering condition 1275°C for 1.Oh in air ; sintering condition 1250°C for 0.5h in air ; magnetic and physical properties are Jm=0.398 T, Jr=0.360 T, HcJ=103.6 kA/m, HcB=101.8 kA/m, (BH)max=19.9 kJ/m3, Tc=357°C, HA=1012 kA/m, KA=2.01x105J/m3

Magnetic Properties of W-type Hexagonal Ferrite Magnets in Ba-Zn-Na System.