摘要
采用高温燃烧合成法制备MnZn铁氧体粉体,并对多种添加物,如CaO,Nb2O5,SnO2和Ta2O5对MnZn铁氧体性能的影响进行了深入地研究。结果表明:4种掺杂离子对MnZn铁氧体性能的影响各不相同。掺入的部分Nb5+和Sn4+可溶于MnZn铁氧体的晶格内,改变其晶格大小,并使初始磁导率μi与温度θ曲线上第2峰的位置向低温方向移动,但Nb5+和Sn4+对晶粒的生长影响较小。由于Ta5+离子只存在于晶界处,所以对晶格常数和第2峰位置的影响均很小,但Ta5+的存在有利于晶粒的生长,随Ta5+的掺入量增加,铁氧体的晶粒尺寸增大,气孔率降低。此外,4种掺杂离子对MnZn铁氧体性能的影响是相互关联的,当添加物的质量分数为CaCO30.05%,Nb2O50.024%,SnO20.15%,Ta2O50.024%时,初始磁导率μi达到最大,功耗Pv达到最小。
(Mn-Zn)Fe2O4 powders were prepared by the combustion synthesis method. The effect of the multiple dopants, such as CaO, Nb2O5, SnO2 and Ta2O5, on the properties of Mn-Zn ferrite was discussed. The results show that Ca2+, Nb5+, Sn4+ and Ta5+ ions have different effects on the properties of Mn-Zn ferrite. The partial doping of Nb5+ and Sn4+ can be dissolved in the crystal lattice of Mn-Zn ferrite to change the lattice constant and thus the second peak on the initial magnetic permeability μi-temperature curve shifts to the low temperature area. However Nb5+ and Sn4+ ions only have little effects on the growth of the crystal grains. The doping of Ta5+ ion promotes the growth of the grains. With the increase of Ta5+ doping content, the grain size increases and the porosity decreases. When the mass fraction of CaCO3, Nb2O5, SnO2 and Ta2O5 are 0. 05%, 0.024%, 0.15% and 0.024% respectively, the magnetic permeability of Mn-Zn ferrite reaches to the maximum value and the power loss is in the minimum value.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第6期747-750,共4页
Journal of The Chinese Ceramic Society
基金
哈尔滨工业大学交叉基金(MD.2003.03)资助项目。
关键词
燃烧合成
铁氧体
功率损耗
Additives
Grain growth
Lattice constants
Magnetic permeability
Metallographic microstructure
Porosity
