纳米Fe3O4的居里温度和粒径的依赖性

功能材料, 2008, 39(8): 1377-1379.

1.新疆大学,物理科学与技术学院,新疆,乌鲁木齐,830046

2.新疆大学,物理科学与技术学院,新疆,乌鲁木齐,830046

基金项目: 国家自然科学基金(50661005) 新疆大学校科研和教改项目(BS050101) 教育部留学回国人员科研启动基金(030205)

Dependence of the Curie temperature on the diameter of Fe3O4 nanoparticles

超细Fe3O4粒子(5～50nm)用化学共沉淀法制备,粒子的半径由FeSO4·7H2O和NaNO2的摩尔比来控制.通过磁性测试发现,居里温度Tc随粒径变小而降低,并且还发现,在高温下由于超细Fe3O4粒子团簇长大,对应Tc明显升高.粒子的居里温度Tc值由公式M～(1-T/Tc)β确定.

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