熔盐合成BaFe_(12)O_(19)六角铁氧体及磁性能研究  

Molten Salt Synthesis and Magnetic Properties of BaFe_(12)O_(19) Hexaferrite

作　　者：栗海峰[1] 龚荣洲[2] 卢秀芳[1] 余伟[1] 王鲜[2] 范力仁[1] 何岗[1] 

机构地区：[1]中国地质大学(武汉)材料科学与化学工程学院,武汉430074 [2]华中科技大学电子科学与技术系,武汉430074

出　　处：《无机材料学报》2011年第8期792-796,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(50972135);湖北省耐火材料与高温陶瓷重点实验室-省部共建国家重点实验室培育基地开放基金(G201003)~~

摘　　要：以Fe2O3、BaCO3为原料,采用熔盐法合成了BaFe12O19(BaM)六角铁氧体,研究了煅烧温度、反应时间、熔盐添加量R及Fe3+/Ba2+摩尔比对产物物相、显微结构及磁性能的影响.结果表明,熔盐合成BaM的反应温度低于750℃,中间产物为BaFe2O4及BaFe4O7.Fe3+/Ba2+摩尔比在10～11.5可得BaM单相.熔盐添加量R为1～3时,所制BaM颗粒为规则六角片状.Fe3+/Ba2+摩尔比为11.5,煅烧温度为1000℃时制得的BaM的比饱和磁化强度为71.9A.m2/kg,接近其理论值72A.m2/kg.Barium ferrite BaFe12O19（BaM） powders were prepared by using molten salt method.The preparation conditions of samples were investigated in detail,such as annealing temperature,soaking time,molten salt additive amount and Fe^3＋/Ba^2＋ molar ratios.The phase composition,microstructure and magnetic properties of the resultant powders were measured respectively by X-Ray Diffractometer（XRD）,Scanning Electron Microscope（SEM） and Vi-brating Sample Magnetometer（VSM）.Formation of BaM started below 750℃ in 0.5NaCl＋0.5KCl.Single phase BaM powders were obtained while the Fe^3＋/Ba^2＋ molar ratios was controlled in the range from 10 to 11.5.The SEM results showed that the grains were regular hexagonal platelets when molten salt additive amount R was controlled in the range from 1 to 3.The resultant powders achieved under condition of Fe^3＋/Ba^2＋ molar ratios of 11.5 and cal-cination temperature of 1000℃ showed the saturation magnetization up to 71.9A.m^2/kg,which was quite close to the theoretical value of 72A.m^2/kg.

关 键 词：熔盐合成 BAFE12O19 六角铁氧体 磁性能 

分 类 号：O482[理学—固体物理]