Fe_2O_3/SrO摩尔比和焙烧温度对锶铁氧体粉体形貌和磁性能的影响  

Influence of Fe_2O_3/SrO ratio and calcining temperature on morphology and magnetic properties of strontium ferrite powder

作　　者：李享成[1] 赵章[1] 朱伯铨[1] 

机构地区：[1]武汉科技大学耐火材料与高温陶瓷重点实验室培育基地,湖北武汉430081

出　　处：《磁性材料及器件》2013年第6期55-58,共4页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(50904048)

摘　　要：以钢铁厂副产品铁鳞为主要原料,采用传统陶瓷合成方法,制备了永磁锶铁氧体粉体。研究了锶铁摩尔比(SrO∶nFe2O3)和焙烧温度对铁氧体粉体显微结构和磁性能的影响。结果发现,锶铁氧体(SrO·nFe2O3)中n值变小,晶胞a轴变短,c轴变长,晶胞体积变小;粉体的矫顽力从204kA/m增加到264kA/m,剩余磁化强度略有降低。焙烧温度增高使锶铁氧体晶粒变大,当温度达到1250℃时,晶粒尺寸增大到1.5μm,矫顽力Hcj则由271kA/m急剧降低到125kA/m,剩余磁化强度则由37.5 A·m2/kg增加到39.0 A·m2/kg。Using by-product of Fe2O3in iron and steel industry as main raw materials, SrFe12O19ferrite powder has been prepared using traditional ceramic method. The influence of mol ratio n（Fe2O3：SrO） and calcining temperature on its microstructure and magnetic properties have been investigated. The result shows that with decrease of n value in Sr-ferrite, crystal parameter of a decreases and c axis increases. The crystal volume decreases correspondingly. At the same time, the crystal grain size of 1.0μm（n=5.6） could enhance the intrinsic coercivity（Hcj） from 204kA/m to 264kA/m while the remnant magnetization keeps slight decrease. When the calcining temperature increases to 1250℃, the grain size of crystal increases to 1.5μm and the corresponding Hcj decreases from 271kA/m to 125kA/m drastically. The remnant magnetization increases from 37.5emu/g to 39.0emu/g.

关 键 词：锶铁氧体 锶铁摩尔比 焙烧温度 磁性能 

分 类 号：TM277.1[一般工业技术—材料科学与工程]