Ni-Ti复合取代锂铁氧体的显微结构及磁性能  

Microstructure and Magnetic Properties of Lithium-ferrite Substituted by Ti and Ni

作　　者：杨洪杰[1] 唐可[1,2] 徐光亮[1] 余洪滔[1] 刘桂香[1] 

机构地区：[1]西南科技大学,新材料研究所,四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,四川绵阳621010 [2]重庆文理学院电子电气工程学院,重庆402160

出　　处：《硅酸盐学报》2011年第12期1963-1967,共5页Journal of The Chinese Ceramic Society

基　　金：四川省教育厅重点(08ZA009);西南科技大学博士研究基金(08ZX0102)和西南科技大学博士研究基金(09ZX7104)资助项目

摘　　要：采用氧化物法陶瓷工艺制备Li0.5-0.5x+0.5yNixTiyFe2.5-0.5x-1.5yO4(x=0.2;y=0.05,0.10,0.15,0.20,0.25)锂铁氧体,研究材料的显微结构和磁性能。X射线衍射和扫描电镜测试结果表明:经1050℃烧结得到物相单一、结晶良好锂铁氧体陶瓷;随着Ti离子掺量的增加,材料的晶格常数逐渐增大,平均晶粒尺寸明显增加,由8μm增大到30μm;锂铁氧体的饱和磁化强度调节到1752～2412Gs;矫顽力明显改善,从5.5Oe(1Oe=79.5A/m)降低到2.9Oe;多数样品矩形度良好、剩磁比大于0.85,最大剩磁比为0.87。Ferrites of Li0.5-0.5x＋0.5yNixTiyFe2.5-0.5x-1.5yO4 were fabricated by oxide ceramic processing, and microstructure and magnetic properties of Li-ferrite were investigated. Results from X-ray diffraction and scanning electron microscopy show that Li-ferrite exhibits a single phase with spinal structure, and are crystallized well, after sintering at 1050 ℃, respectively. Titanium substitution enlarges crystal volume of the ferrite with grain size increasing from 8 μm to 30 μm. Meanwhile, saturation magnetizations varie from 1752 Gs to 2412 Gs, while coercivety decrease remarkably from 5.5 Oe （1Oe=79.5 A/m） to 2.9 Oe. Most samples show well remanence ratios which are better than 0.85, and the maximum is 0.87.

关 键 词：锂铁氧体 离子取代 氧化物法 显微结构 磁性能 

分 类 号：TM277[一般工业技术—材料科学与工程]