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Ni–Ti复合取代锂铁氧体的显微结构及磁性能

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Abstract:

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。

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