Synthesis and characterization of La doped M-type hexagonal barium ferrite fine powders

来源期刊：中国有色金属学报(英文版)2001年第3期

论文作者：李洪桂 郭睿倩 孙培梅 李运姣 赵中伟 刘茂盛 苏鹏抟

文章页码：447 - 450

Key words：so-gel method； rare earth； permanent magnetic ferrite； citrate

Abstract: The hexagonal BaLa_xFe_12-xO₁₉ fine powders with M-type structure were synthesized by sol-gel method. The pH of the solution, the molar ratio of nitrate to citric acid and the calcination temperature were investigated to clarify the forming conditions of the ferrites. The crystal structure, grain size, form and magnetic properties were studied by means of XRD, SEM and vibrating sample magnetometer. It is concluded that at pH of 7.0 or so, molar ratio of nitrate to citric acid of 1/3 and calcination temperature of 850 ℃(1 h)，1 000 ℃, M-type BaLa_x Fe_12-xO₁₉ fine powders with a particle size of less than 300 nm was obtained.