• 作者： 洪銘盤；松村源太?；陳琨琪
• 作者服務機構： 國立成功大學礦冶及材料科學研究所
• 中文摘要： SrCO3,PbO,Al203及B2O3粉末各與Ba0+5. 5Fe203混合後依照陶瓷製造方法製成（BaO)1,-x (MaOb)x/a* 5 .5Fe2O3體。取代型瓷體經測定體密度、晶粒直徑、顯微組織及晶體結構後尋求與製造條件及磁性有關的關係。 取代型鋇系磁體的磁性、體密度、晶粒直徑等均與取代離子有密切關係。其中以B2O3最有效改善磁性。Br的增加可 歸於B3+ 優先取代四面體間隙中的Fe3+及在液相燒結中發生的易磁化軸偏向效果。Br的減少可歸於B3+的無定向取代作用。 添加3mole﹪B2O3並在1200℃燒結10分的異方性磁體的磁性最佳，則（BH) max= 2. 57MG. Oe, Br=3. 65KG及bHc=1.50KOe
• 英文摘要： SrCO3, PbO, Al2 03 and B2O3 powders were added respectively to a mixture of BaO+5.5 Fe203 and processed to form (BaO)1-x *(MaOb)x/a *5*5Fe2O3 ferrites by the ordinary ceramic technique. Bulk density, grain size, microstructure and crystal structure of substituted ferrites were determined and interrelated with their processing variables and magnetic properties. The variation in magnetic properties, bulk density and grain size of substituted Ba ferrites was studied as a function of the substitution of cations such as Sr2+, Pb2+, Al3+ and B3+ for Ba2+ and Fe3+. Among them, the effect of B203 addition was most effective in improving the magnetic properties of ferrites. An increase in Br could be explained by preferential tetrahedral substitution of B3+ for Fe3+ in a spinel block and a moderate texture effect in liquid phase sintering. A decrease in Br was due to random substitution of B3+ in a spinel block. The best results for an anisotropic Ba ferrite added with 3 mole % B203 and sintered 10 minutes at 1200蚓 were found to be (BH)max = 2.57 MG*Oe, Br = 3.65 KG and bHc = 1.50 KOe.
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