Ba取代对Sr-Ca-La-Co系六角铁氧体的微结构及磁特性的影响  

Effect of substitution of Ba for Sr on the microstructure and magnetic properties of Sr-Ca-La-Co type hexaferrites

作　　者：陈中艳[1] 王凡[1] 李金道 詹振华 吕兆民 冯则坤[1] 

机构地区：[1]华中科技大学光学与电子信息学院,湖北武汉430074 [2]广东江粉磁材股份有限公司,广东江门529000

出　　处：《磁性材料及器件》2014年第5期53-57,共5页Journal of Magnetic Materials and Devices

基　　金：广东省教育部产学研合作项目(20110905)

摘　　要：采用Ba部分取代Sr制备（Ca0.37La0.38Sr0.25-yBay）Fe10.4Co0.24O19（y=0~0.04）铁氧体,研究了样品的磁特性和微结构。当y=0时,预烧样品在1250℃保温1.5h可形成单一的M相,比饱和磁化强度（σs）和矫顽力（Hcj）达到最大,分别为67.82 A·m2/kg和383.8kA/m。少量Ba（y≤0.04）取代Sr元素时,预烧样品依然为单一的M相。随着Ba2＋取代Sr2＋的增加,预烧样品的比饱和磁化强度（σs）上升,在y=0.04时达到最大,从67.82A·m2/kg增加到69.53 A·m2/kg,矫顽力略有下降。当烧结温度为1170℃（保温1.5h）时,样品的剩余磁化强度（Br）随着y的增加而上升。在y=0.03时获得最佳磁性能,Br=450mT,Hcj=412kA/m,（BH）max=38.2 kJ/m3,通过Ba元素取代,能同时提高Br和Hcj。但取代量过多时Br和Hcj会下降。M-type（Ca0.37La0.38Sr0.25-yBay） Fet0.4Co0.24O19, hexaferrites were prepared, and effect of Ba element on their magnetic properties and microstructure were investigated. The optimum calcining parameters of specimen （Ca0.37La0.38 Sr0.25） Fe10.4Co0.24O19 were determined at 1250℃ for 1.5h, and presintered sample was obtained with σs and HcJ of 67.82 A.m2/kg and 383.SkA/m, respectively. When y increases from 0 to 0.04, the presintered materials keep single phase, and their σs increases from 67.82 to 69.53 A.m2/kg without significant decrease in Hcj. For the samples sintered at 1170 ℃ for 1.5h, Br increases withy. The largest Br and HcJ were 450mT, 412kA/m, and （BH）max=38.2kJ.m-3 for y=0.03. The opposite tendencies of Br and Hcj can compensate with Ba substitution. However, the excessive Ba substitution deteriorates the Br and Hcj.

关 键 词：M型六角晶系铁氧体永磁材料 Ba取代 微观形貌 磁性能 

分 类 号：TM277.2[一般工业技术—材料科学与工程]