Synthesis and Characterization of Gadolinium Doping M-type Hexagonal Barium Ferrite Ultrafine Powders
来源期刊：JOURNAL OF RARE EARTHS2003年第5期
论文作者：郭睿倩 顾明元 陈亚杰 梁乐 孙培梅 金燕萍 李洪桂
Key words：materials science; sol-gel method; permanent ferrite; citrate; ultrafine powders; rare earths;
Abstract: The hexagonal BaGdxFe12-xO19 (x=0.1～1.0) nano-sized powders with M-type structure were synthesized by the sol-gel auto-combustion high-temperature synthesis method. The effects of pH of the solution, the molar ratio of nitrate/citric acid and the calcination temperature on the synthesis of the ferrites were investigated. The crystal structure, grain size, shape and magnetic properties were studied by means of XRD, TEM and vibrating sample magnetometer.The results show that under the conditions of pH 7.0 or so, mole ratio of citrate/nitrate (1～3) and calcination temperature of 850 ℃ for 1 h, M-type BaGdxFe12-xO19 ultrafine powders with a particle size of less than 100 nm can be obtained, and the coercive force reaches 430 kA*m-1 at x=1.0, which is far greater than that of barium ferrite (BaFe12O19).
郭睿倩1，顾明元1，陈亚杰3，梁乐1，孙培梅4，金燕萍1，李洪桂4
(1.State Key Laboratory of MMCs, Shanghai Jiaotong University, Shanghai 200030, China;
2.Institute of Advanced Materials Fudan University Shanghai 200433, China;
3.Department of Physics, Suzhou University, Suzhou 215006, China;
4.Department of Metallurgy Science and Engineering, Central South University, Changsha 410083, China)
Abstract:The hexagonal BaGdxFe12-xO19 (x=0.1～1.0) nano-sized powders with M-type structure were synthesized by the sol-gel auto-combustion high-temperature synthesis method. The effects of pH of the solution, the molar ratio of nitrate/citric acid and the calcination temperature on the synthesis of the ferrites were investigated. The crystal structure, grain size, shape and magnetic properties were studied by means of XRD, TEM and vibrating sample magnetometer.The results show that under the conditions of pH 7.0 or so, mole ratio of citrate/nitrate (1～3) and calcination temperature of 850 ℃ for 1 h, M-type BaGdxFe12-xO19 ultrafine powders with a particle size of less than 100 nm can be obtained, and the coercive force reaches 430 kA*m-1 at x=1.0, which is far greater than that of barium ferrite (BaFe12O19).
Key words:materials science; sol-gel method; permanent ferrite; citrate; ultrafine powders; rare earths;
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