Synthesis and characterization of La doped M-type hexagonal barium ferrite fine powders|LI Hong-gui(李洪桂), GUO Rui-qian(郭睿倩),SUN Pei-mei(孙培梅), LI Yun-jiao(李运姣), ZHAO Zhong-wei(赵中伟), LIU Mao-sheng(刘茂盛), SU Peng-tuan(苏鹏抟)-《中国有色金属学报》官方网站|全网首发|论文开放获取

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 11 No. 3 June 2001

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

LI Hong-gui(李洪桂), GUO Rui-qian(郭睿倩),
SUN Pei-mei(孙培梅), LI Yun-jiao(李运姣),
ZHAO Zhong-wei(赵中伟), LIU Mao-sheng(刘茂盛), SU Peng-tuan(苏鹏抟)

（Department of Metallurgy Science and Engineering,
Central South University,Changsha 410083, P.R.China）

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.

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW