采用柠檬酸盐自燃烧法制备纳米锰锌(Mn—Zn)铁氧体微粒,研究后续热处理温度对产物的饱和磁化强度(Ms)、矫顽力(Hc)的影响。结果表明,纳米Mn—Zn铁氧体微粒的Ms、Hc随着热处理温度的升高,变化趋势都是先增大后减小。Ms在热处理温度为450℃时,达到最大值(46.8Am^2/g);Hc在热处理温度为400℃时,达到最大值(2.7×10^8A/m)。纳米Mn—Zn铁氧体微粒的单畴临界尺寸大约为58nm。
Mn-Zn ferrite nanopartieles are prepared by citrate auto-combustion method. Some researehes have been made on effeets of heat treatment temperature on eoereivity and saturation magnetization of Mn-Zn ferrite nanopartieles. The results show that:with the inereasing of heat treatment temperature, saturation magnetization and eoereivity of Mn-Zn ferrite nanoparticles increase primarily, then deerease. When heat treatment temperature is 450℃, saturation magnetization reaehes the maximum 46. 8Am^2/kg; when heat treatment temperature is 400℃ ,coercivity reaehes the maximum 2.7×10^5A/m. The critical size of single magnetie domain of Mn-Zn ferrite is 58nm approximately.