摘要
采用XPS及氧化还原滴定等手段确定了一种锌锰铁氧体纳米晶的离子分布式。采用XRD测定的样品晶格常数(a测=0.8431nm)与通过理论计算的结果(a=0.8393nm)十分接近。样品在350,450和700℃经过4h热处理后,离子分布数相应发生了变化:阳离子空位数e在350℃时达到最大值0.05520;晶格常数a随晶体阳离子空位数e的增加而增大,当e大于0.05时,晶格常数a的增加变缓。热处理温度不同,样品比饱和磁化强度σm相应改变,在350℃有最小值58.5Am2/kg。理论计算与实验结果表明,样品的比饱和磁化强度σm与晶体中阳离子空位数e和次晶格上各价态的离子分布方式有关。
The ion distribution model of ZnMn ferrite was determined by XPS and oxidimetry methods. The crystal lattice constant measured by XRD (0.8431 nm )is close to that of calculated(0.839 3 nm) by the ion distribution model. The number of ion distribution in the model changes after heat treatment at 350, 450 and 700 ℃ respectively, due to the different ability of occupying A and B sublattice of different metal ions. The metal ion vacancy e has a maximum value of 0.055 20 at 350 ℃. The lattice constant a increases with the increase of metal ion vacancy e and at e=0.05 the increasing tendency becomes slow. The specific saturation magnetization σm alters with the heat treatment temperature and has a minimum value of 58.5 A·m2/kg at 350 ℃. Theoretical calculation and experimental results show that the specific saturation magnetization σm is related with metal ion vacancy e and the crystal ion distribution model.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2003年第4期1041-1045,共5页
The Chinese Journal of Nonferrous Metals
关键词
锌锰铁氧体
纳米晶
水热法
制备
离子分布
磁性能
ZnMn ferrite nanoscale particles
ion distribution
defect
magnetic property
