富Li对LiZn铁氧体微观结构和磁电性能的影响  

Effects of Li-excess on Microstructure and Magnetoelectric Properties of Lithium-zinc Ferrites

作　　者：罗明[1] 蒋晓娜[1] 余忠[1] 孙科[1] 兰中文[1] 王智锟[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《压电与声光》2011年第4期608-611,622,共5页Piezoelectrics & Acoustooptics

基　　金：国防预研基金资助项目(51307060305;9140A07051409DZ0235)

摘　　要：采用氧化物陶瓷工艺，按组分L0.35＋xZn0.3Mn0.06Fe229O4＋8＋2％Bi2O3（x=0～0．180）在1000℃下制备LiZn铁氧体，研究了不同富Li量对LiZn铁氧体微观结构、磁性能和介电性能的影响。结果表明，当富Li量x≤0．015时样品断面的微观形貌变化不大，晶粒均匀致密，而x≥0．045时，气孔和缺陷增多，晶粒尺寸减小；随着富Li量的增加，饱和磁化强度和剩磁比先略微增大后明显减小，矫顽力呈先缓慢后迅速增大趋势，而电阻率单调上升，介电损耗先下降后上升。当x=0．045时，LiZn铁氧体微观结构和磁性能较好，介电损耗角正切下降至5．25×10^-4。The Lithium zinc （LiZn） ferrites with composition of Li0.35＋xZn0.3 Mn0.0s Fea29 O4＋e ＋ 2%Bi2O3 （x= 0-0. 180） were prepared at 1 000 ℃ by the conventional oxide ceramic process. The Effects of different Li-excess contents on the microstructure, magnetic and dielectric properties of LiZn ferrites were investigated in this work. The SEM analysis revealed that the mierostructure of the sample had little change and the grain was uniform and compact when the I.i-excess contents x was equal to and less than 0. 015. When x was equal to and bigger than 0. 045 ,the grain growth suffers from the restraint due to the increased pores and impurities. With Li-excess increasing,the saturation magnetization intensity and the residual magnetization ratio of LiZn ferrites increased slightly firstly and then decreased obviously,while the coercivity increased gradually at first and showed an evident increase. Meanwhile,the resistivity increased monotonously and the dielectric loss tangent decreased firstly and then increased obviously. The sample had fine microstructure and magnetic properties and its dielectric loss tangent reduced to 5.25× 10^-4 when x=0. 045.

关 键 词：LIZN铁氧体 富Li 微观结构 磁性能 介电性能 

分 类 号：TM277[一般工业技术—材料科学与工程]