共沉淀法制备的锶铁氧体磁粉的结构、形貌及磁性能(英文)

Structure,Morphology and Magnetic Property of Sr-ferrite Powder Synthesized by the Co-precipitation Route

采用共沉淀法按照n(Fe)∶n(Sr)=10∶1合成M型锶铁氧体。通过把样品在不同的温度下退火,研究了退火温度对晶体结构、形貌和磁性能的影响。所制备的样品用FTIR、XRD、SEM和VSM进行表征。结果表明,当退火温度为1000℃时样品颗粒分布规则且比饱和磁化强度达最大值,为77.87emu/g。当退火温度为1100℃时样品颗粒变成球形且矫顽力最小,为1601Oe。此外,通过控制退火温度可使矫顽力在1601～4591Oe范围内变化。

M-type Sr-ferrite powder with Fe^3＋ to Sr^2＋ of 10 ： 1 mole ratio was synthesized by the chemical co-precipitation-calcination route. The samples were sintered at different temperatures from 800℃ to 1100℃ in order to investigate the effects of sintering temperature on the crystal structure, grain size, morphology and magnetic properties. The powders were characterized by infrared spectra, powder X-rays diffraction, scanning electron microscopy and vibrating sample magnetometer. Powders sintered at 1000℃ show the best homogeneity in terms of size and mo rphology, and possess the highest saturation magnetization of 77.87emu/g. Powders sintered at 1100℃ have a spheri cal shape and show the lowest coercivity of 1601Oe. The results also show that a wide range of coercivity varying from 1601Oe to 4591Oe could be obtained by selecting the appropriate calcination temperature.