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EFFECT OF Na₂O ADDITION ON MAGNETIC PROPERTIES OF SrZn₂-W TYPE HEXAGONAL FERRITE
Hiroshi Yamamoto,Hiroshi Fujii,Takayuki Mitsuoka 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
An experiment was carried out to investigate the effect of Na₂O additive on the magnetic and physical properties of SrZn₂-W type hexagonal ferrite. The specimens were prepared by the conventional manufacturing methods without atmosphere control. It was found that the magnetic properties of SrOㆍ2ZnOㆍ8Fe₂O₃ are considerably improved on adding 1.5wt% Na₂O. The optimum condition of making magnet with suitable properties are as follows : chemical analysis composition: Sr²+_(0.852)Zn²+_(l.721)Na+_(0.301)Fe²+_(0.723)Fe³+_(15.703)O_(27) ; semisintering condition: 1300℃ × 1h in air; sintering condition: 1250℃ × 0.5h in air. The magnetic properties are: Jm= 0.390 T, Jr= 0.348 T, H_(cJ)= 133.7 ㎄/m, H_(cB)= 129.7 ㎄/m, (BH)max = 21.50 kJ/㎥, Tc=371℃, H_A= 1091.5㎄/m, K_A = 2.13 × 10^5J/㎥ and n_B= 31.8 μB.