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異方性 Ba-ferrife의 磁性에 미치는 SrCO₃의 添加效果
全鶴坤,吉炳龍,李東熙 연세대학교 산업기술연구소 1982 논문집 Vol.14 No.1
The effect of SrCO₃addition on the improvement of magnetic properties of anisotropic Ba-ferrite was studied by employing the crystallographic investgation into the change of structural orientation due to the addition and subsequent treatment. From the results obtained in these experiments, the followings were concluded; Ba-farrite containing 1.3wt. % Sr, i.e. (Ba0)₁(Sro)??- 5.45 Fe₂O₃,has showed the highest improvement of magnetic properties when sintered at 1250℃ for one hour, where the measured Br,??H?? and (B·H)???were respectively 3,500G, 2,600 Oe and 3.4 MG Oe. The orientaion parameter of this composite was 0.71, and an linear relationship, q=6x10? Br+0.502, was also found between the orentation parameter q and remanence Br. The reasons for these could be attributed to the facts that; (1) this content of Sr falls into the reported optimum range (5.2-5.8) of the mloe ratio of FeOł涍/(BaO)-(SrO). The proper amount of Sr is believed to enhance the formation of a complex ferrite, (BaO)??(SrO)??-n Fe₂O₃, through the diffusional process replacing some of Ba????ions by Sr????ions in the ferrite structure. (2) The possible eutectic reaction between SrO and BaO could be occured at as low as 1250 ˚C and may result in the impoved sinterability of the compacts through the liquid-phase like sintering. ·
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