柠檬酸含量对溶胶凝胶自燃烧法制备的钡铁氧体磁性能的影响

• Published in: 上海大学学报（英文版） Vol. 11; no. 3; pp. 263 - 267
• Main Authors: 钟敏建, 徐国庆, 马洪良, 周炯, 岳中岳, 何正明
• Format: Journal Article
• Language: Chinese
• Published: Department of Physics,College of Sciences,Shanghai University,Shanghai 200444,P R.China 2007
• Subjects: magnetic properties; citric acid content; sol-gel auto-combustion
• ISSN: 1007-6417

O4; BaFe12O19 powders with nanocrystalline sizes were produced by sol-gel auto-combustion method.The precursors were prepared under the molar ratios of citric acid to the metal nitrate of 0.5.1.0 and 1.5.Appropriate ethylene diamine C2HsN2)was added in order to adjust pH of 7.The ions distribution of citric acid at different pH explains the effect of citric acid in the starting solution.The XRD patterns of the as-burnt powders and annealing powders show different phases for different citric acid content.In addition,the lattice constants(a,c)derived from X-ray diffraction pattern were changed from 0.58881 nm to 0.58997 nm and 2.32057 nin to 2.32296 nm respectively.The data from VSM indicated that the powder with high citric acid content took on good magnetic properties.Pure single BaFe12O19 of the specific maximum magnetization M(1 T)≈49.73 Am2/kg,the specific remanent magnetization Mr≈30.77 Am2/kg and the coercive force Hc≈467 kA/m Was produced when the molar ratios of citric acid to the metal nitrate was 1.5