CaCO_3、SnO_2掺杂对MnZn铁氧体微结构和性能的影响

Effects of CaCO_3,SnO_2 Doping on the Microstructure and Properties of MnZn Ferrites

本文采用传统陶瓷工艺制备了高磁导率MnZn铁氧体材料。为获得高磁导率MnZn铁氧体材料,从分析材料微观结构入手,研究了适当的工艺条件以及CaCO3和SnO2不同的掺入比对高磁导率MnZn铁氧体材料性能的影响。研究结果表明,由于Ca2+离子存在于晶界,少量的CaCO3掺入会使铁氧体晶粒尺寸增加,均匀性改善,起始磁导率增加,而CaCO3掺杂过量,将会增加晶粒中的气孔率,从而降低起始磁导率。SnO2掺入后,由于Sn4+离子存在于晶界中,为满足电荷平衡的要求,引起晶界附近金属离子空位增多,从而加速畴壁的运动,提高材料的起始磁导率。

The sample of MnZn ferrite with high permeability was prepared by conventional ceramic techniques in the paper.To get high initial permeability MnZn ferrite material,under proper technological conditions and in different additional proportion,the effects of doping CaCO_3 and SnO_2 on the high permeability MnZn ferrites were studied on the basis of microstructure analysis.The results show that doping some amount of CaCO_3 could facilitate to increase the crystal grain size,to make the uniformity of the particle size and to enhance the initial permeability due to Ca^(2+) ion exiting on the crystal boundary.Meanwhile doping excessive CaCO_3 could increase crystal grain porosity,reduce the initial permeability.Doping some amount of SnO_2 could make metal ion manifolded in crystal boundary for contenting charge balanceable condition,hence it could speed up domain wall structure and enhance the initial permeability.