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

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

Vol. 11 No. 3 June 2001

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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

Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU) 湘ICP备09001153号-9