| 纳米BaFe12O19永磁铁氧体的制备、结构和磁性的研究 |
| The Study of the Synthesis, Structure and Magnetic Properties of Nanometer BaFe12O19 Permanent Magnetic Ferrite Powder |
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| 摘要: |
| 关键词: 纳米磁性材料 永磁铁氧体 合成技术 热处理 |
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| Abstract: In this paper, the nanometer permanent magnetic BaFe12O19 powder was synthesized by a novel method of independent nucleation and crystallization steps and subsequent heat treatment,during the synthesis, Ba(NO3)2, Fe(NO3)2 and NH4HCO3·NH2COONH4 were used as starting materials. The effect of crystallization process and heat treatment conditions on the particle size, microstructure and magnetic properties of powder was studied by using XRD, TEM and vibration sample magnetometometer techniques.XRD results showed that the hematite, α-Fe2O3, was the main phase in the powder at heat treatment temperatures below 650℃ and its amount in the powder was decreased with increasing temperature and small amount of α-Fe2O3 was still remained after being heated at 900℃ for 8hrs. BaFe12O19 was formed about 650℃ and its amount increased in the powder as temperature raised and the higher temperature was needed to attain considerable amount of BaFe12O19 and ideal nanometer BaFe12O19 particle in the powder. The temperature between 40℃～60℃ in the crystallization process was favor to the formation of good BaFe12O19 crystal and to the good magnetic properties of the powder. TEM showed that the particle size in the powder increased with the enhancement of the temperature and the powder crystallized at 40℃ and heated at 800℃ for 8hrs afterwards had a very homogenous particle size distribution, and that the powder heated at 900℃ for 8hrs with the same crystalline condition as the former had a typical hexagonal shape and a chain aggregation. Specific saturation and residential magnetizations and coercive force of the powder increased mono-tonically with the increase of temperature, and reached 39.86A·m2·kg-1, 23.96A·m2·kg-1, 480kA·mg-1 at 900℃, respectively. |
| Keywords: nanometer magnetic material permanent magnetic ferrite synthesis technology heat treatment |
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| 战可涛,郑俊,张慧,段雪,张密林.纳米BaFe12O19永磁铁氧体的制备、结构和磁性的研究[J].无机化学学报,2002,18(3):294-298. |
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