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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(46.8Am2/g);Hc在热处理温度为400℃时,达到最大值(2.7×105A/m)。纳米Mn-Zn铁氧体微粒的单畴临界尺寸大约为58nm。
The Mn-Zn ferrite particles were prepared by self-combustion of citrate, and the effect of subsequent heat treatment on the saturation magnetization (Ms) and coercive force (Hc) of the product was investigated. The results show that the Ms and Hc of nano-Mn-Zn ferrite particles increase first and then decrease with the increase of heat treatment temperature. Ms reaches the maximum value (46.8Am2 / g) when the heat treatment temperature is 450 ℃; the maximum value of Ms (2.7 × 105A / m) when the heat treatment temperature is 400 ℃. The single domain critical dimension of the nano-Mn-Zn ferrite particles is approximately 58 nm.