摘要
研究丁CuO、MoO3和WO3掺杂对NiZn铁氧体电磁性能的影响.研究表明,适量的CuO掺杂能提高材料烧结密度并降低磁晶各向异性常数,从而提高材料的起始磁导率,但居里温度也有一定程度的下降.当主配方中CuO含量(摩尔分数)为4%时能最好的兼顾材料高磁导率和高居里温度的要求.而MoO3和WO3掺杂则均能引起晶界附近阳离子空位增多,从而加速晶界移动,促进晶粒尺寸增大,进而提高材料的起始磁导率.同时,由于W离子具有较强的占据铁氧体A位替代Fe3+的趋势,需要更大的掺杂量才能达到磁导率的峰值,其居里温度和饱和磁感应强度也低于相应MoO3掺杂的材料.
The effects of CuO , MoO3 and WO3 on the magnetic properties of NiZn ferrites were investigated. The results showed that proper CuO doping could increase bulk density and decrease anisotropy constant of the NiCuZn ferrite samples, so the initial permeability increased. But the Curie temperature decreased in a certain extent. 4%（molar fraction） CuO content could farthest give attention to high initial permeability and high Curie temperature demand of the NiCuZn ferrites. The Effects of MoO3 and WOa doping on magnetic properties of the NiZn ferrites were also investigated. It was found that both of them could increase metallic ion vacancies in the grain boundary region; as a result, the speed of the grain boundary movement increased, thereby promoting grain growth. Consequently, the initial permeability of samples increased. Tungsten ions also had a stronger preference of tetrahedral site of ferrites and could partially substitute ferric ions, so more WO3 content was necessary to obtain highest initial permeability, Curie temperature and saturation magnetism of WO3 added samples were also lower than that of MoO3 added samples.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2005年第5期549-554,共6页
Chinese Journal of Materials Research
基金
国家杰出青年基金60425102资助项目~~
关键词
无机非金属材料
起始磁导率
居里温度
NICUZN铁氧体
掺杂
inorganic non-metallic materials, initial permeability, curie temperature, NiCuZnferrites, additive
