缺铁配方及烧结助剂对锂铁氧体显微结构及电磁性能的影响  

Influence of Iron Deficiency and Sintering Aids on Microstructure and Electromagnetic Properties of Li-ferrite

作　　者：唐可[1] 杨洪杰[2] 

机构地区：[1]重庆文理学院电子电气工程学院,重庆402160 [2]西南科技大学材料科学与工程学院,绵阳621010

出　　处：《人工晶体学报》2013年第5期959-962,967,共5页Journal of Synthetic Crystals

基　　金：重庆市教委自然基金项目(KJ121209);重庆市科委自然科学基金计划资助项目(CSTC2012JJA50036);重庆文理学院人才引进项目(Z2011RCYJ03)

摘　　要：采用氧化物法陶瓷工艺,对Li0.45Ni0.2Ti0.1Fe2.25O4铁氧体材料进行了缺铁配方、缺铁并添加烧结助剂等两方面的研究。结果表明:缺铁及添加Bi2O3都没有在锂铁氧体中形成杂相,烧结后陶瓷样品物相组成单一,结晶状况良好;这两种配方变化对材料微观形貌均有改善作用,其中同时缺铁并添加烧结助剂作用更为明显,该样品具有良好的综合性能,表观密度ρ为4.72 g.cm-3,介电损耗为5.4×10-4,饱和磁化强度4πMs为2275 Gs,剩磁比R为0.853,矫顽力Hc为2.9 Oe,能够满足移相器对锂铁氧体材料的性能要求。Ferrites of Li0.45Ni0.2Ti0.1Fe2.25O4,with iron deficiency and doped with Bi2O3 on the basis of iron deficiency,were fabricated by oxide ceramic processing.The results showed that Li-ferrite with Bi2O3 doped and iron deficiency both exhibits a single phase with pure spinal structure and crystallized well.Both formulations of Li-ferrite shows better microstructure,especially the ferrites doped with Bi2O3 on the basis of iron deficiency which shows well comprehensive performance with apparent densities ρ of 4.72 g/cm3,dielectric loss tanδ at 5.4×10-4,saturation magnetizations 4πMs at 2275 Gs,remanence ratios R at 0.853 and coercivety Hc at 2.9 Oe,and could meet the requirements of Li-ferrite used for phase shifter.

关 键 词：锂铁氧体 缺铁 BI2O3 微观形貌 介电性能 磁性能 

分 类 号：TM277[一般工业技术—材料科学与工程]