Comparative study of magnesium ferrite nanocrystallites prepared by sol–gel and coprecipitation methods
Comparative study of magnesium ferrite nanocrystallites prepared by sol–gel and coprecipitation methods
复制标题
DOI：
10.1007/s10853-006-1070-z
复制
发表时间：
2007-04
影响因子：
4.5
通讯作者：
C. Liu;Ming-wei Li;Zhonghui Cui;Juanru Huang;Yiyuan Tian;Tong Lin;W. Mi
中科院分区：
文献类型：
--
作者：
C. Liu;Ming-wei Li;Zhonghui Cui;Juanru Huang;Yiyuan Tian;Tong Lin;W. Mi
采用溶胶-凝胶法和共沉淀法合成了由纳米晶组成的铁酸镁颗粒。它们的平均晶粒尺寸随着煅烧温度的升高而增大。在相同的煅烧温度下，溶胶-凝胶衍生样品的平均晶粒尺寸始终大于共沉淀衍生样品，说明溶胶-凝胶法有利于铁酸镁晶体的形成。溶胶-凝胶衍生的铁酸镁颗粒大多具有纳米晶组成的片层结构，可能来源于多孔的干燥凝胶前驱体。铁素体镁颗粒在27℃时具有超顺磁性，其饱和磁化强度随粒径的增大而增大。
Magnesium ferrite particles consisting of nanocrystallites were synthesized by sol–gel and coprecipitation methods. Their mean crystalline size increased with increasing calcination temperature. At the same calcination temperature, the sol–gel-derived sample always had bigger mean crystalline size than the coprecipitation-derived sample, implying that the sol–gel method facilitated the formation of magnesium ferrite crystallites. Most of the sol–gel-derived magnesium ferrite particles had a lamellar structure consisting of nanocrystallites, which were probably derived from the porous dried gel precursor. The magnesium ferrite particles had superparamagnetic properties at 27 °C, and their saturation magnetization increased with increasing size.