Effects of Heat-treatment on Microstructure and Magnetic Properties of Ba Ferrite Ultrafine Powders Prepared by Sol-gel
来源期刊：材料热处理学报2004年第5期
论文作者：ZHENG Jia-sheng Zhu Mei-wu KONG Xiao-dong
关键词：Barium ferrite; ultrafine powder; microstructure; AFM; magnetic property;
摘 要：Barium (Bag) ferrite ultra fine powders were synthesized by using sol-gel in which polyethylene glycol200(PEG200) was used as gelling agent. The transition of Ba ferrite was studied by thermal gravimetric and differential thermal analysis (TG-DTA) technology. The micro structural changes were analyzed using X-ray diffraction (XRD) and atomic force microscopy (AFM) for the specimens annealed at different temperatures. The transition temperatures were 414.55 ℃ and 755.78 ℃ separately corresponding to BaFe2O4 and BaFe12O19. There were three types of microstructures for Ba ferrite ultrafine powder specimen annealed at 800℃. For the specimens annealed at different temperatures, there were different kinds of Ba ferrites. The ferrite powder consists of BaFe12O19 and BaFe2O4 for the specimen annealed at 800℃,and only BaFe12O19 can be found in the specimen annealed at 1000℃. The magnetic properties, σ s and H c of BaFe12O19ultrafine powders are different from that of BaFe12O19 bulk material.Key Words: Barium ferrite; ultrafine powder; microstructure; AFM; magnetic property
ZHENG Jia-sheng1，Zhu Mei-wu2，KONG Xiao-dong2
(1.Materials College, Huazhong University of Science and Technology, Wuhan, China;
2.Basic Department,Naval University Engineering Wuhan,China)
摘要:Barium (Bag) ferrite ultra fine powders were synthesized by using sol-gel in which polyethylene glycol200(PEG200) was used as gelling agent. The transition of Ba ferrite was studied by thermal gravimetric and differential thermal analysis (TG-DTA) technology. The micro structural changes were analyzed using X-ray diffraction (XRD) and atomic force microscopy (AFM) for the specimens annealed at different temperatures. The transition temperatures were 414.55 ℃ and 755.78 ℃ separately corresponding to BaFe2O4 and BaFe12O19. There were three types of microstructures for Ba ferrite ultrafine powder specimen annealed at 800℃. For the specimens annealed at different temperatures, there were different kinds of Ba ferrites. The ferrite powder consists of BaFe12O19 and BaFe2O4 for the specimen annealed at 800℃,and only BaFe12O19 can be found in the specimen annealed at 1000℃. The magnetic properties, σ s and H c of BaFe12O19ultrafine powders are different from that of BaFe12O19 bulk material.Key Words: Barium ferrite; ultrafine powder; microstructure; AFM; magnetic property
关键词:Barium ferrite; ultrafine powder; microstructure; AFM; magnetic property;
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