预烧温度及Ca含量对La-Ca-Co系铁氧体磁粉结构及磁性能的影响  

Effect of calcination temperature and Ca content on the structure and magnetic properties of La-Ca-Co system ferrite powders

作　　者：孙伟强 Muhammad Haseeb 耿赵文 刘荣明[2] 刘卫强[1] 岳明[1] SUN Weiqiang;Muhammad Haseeb;GENG Zhaowen;LIU Rongming;LIU Weiqiang;YUE Ming(Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;National Magnetic Materials Engineering Technology Research Center,Beijing 102600,China)

机构地区：[1]北京工业大学材料与制造学部,北京100124 [2]国家磁性材料工程技术研究中心,北京102600

出　　处：《金属功能材料》2022年第1期45-49,共5页Metallic Functional Materials

摘　　要：采用常规的陶瓷工艺制备了La_(0.572)Ca_(x)Sr_((0.658-x))Co_(0.356)Fe_(12.4)O_(19)(x=0.1,0.2,0.3,0.4,0.5,0.6,0.658)磁粉,研究了预烧温度和Ca元素含量对磁粉晶体结构、显微组织和磁性能的研究。研究表明,在1190~1230℃的温度下预烧,磁粉均可形成具有典型M型六角晶系SrM铁氧体晶体结构的单一相结构。其中,在1220℃预烧的磁粉具有最佳磁性能。Ca^(2+)取代Sr^(2+)导致M相的晶胞体积缩小,但是相结构稳定不变,随着Ca含量的升高,磁粉的饱和磁化强度出现了先升高后降低的变化规律,当x=0.5时M_(s)=59.30 emu/g,磁粉的矫顽力则变化不大。显微组织观察发现,磁粉颗粒主要呈现为等轴状,平均粒径为0.7μm。Effect of calcination temperature and Ca content on the crystal structure,microstructure,and magnetic properties has been studied for La_(0.572)Ca_(x)Sr_((0.658-x))Co_(0.356)Fe_(12.4)O_(19)(x=0.1,0.2,0.3,0.4,0.5,0.6,0.658)ferrite powders prepared with regular ceramic technique.It shows that the powders bear typical M-type hexagonal crystal structure under calcination temperature range of 1190-1230℃,and the powders achieve best magnetic properties with calcination temperature of 1220℃.Replacement of Sr^(2+)with Ca^(2+)results in shrinkage of cell volume,while the crystal structure maintains stably.As the Ca content increases,the saturation magnetization of the powders increases first,peaks at 59.30 emu/g with x=0.5,then drops,while the coercivity of the powders almost keep invariant.SEM observation indicates that the powders are equiaxed particles with mean diameter of 0.7μm.

关 键 词：SrM铁氧体 Ca含量 预烧温度 晶体结构 磁性能 

分 类 号：TM277[一般工业技术—材料科学与工程]