【摘要】 用化学共沉淀法制备了NiFe2O4、ZnFe2O4和Ni0.64Zn0.36Fe2O4纳米粉体,在室温下测定了它们的磁性能。结果表明:尖晶石型单一反型铁氧体的磁性起源于未抵消的亚铁磁性,正尖晶石型结构的单一ZnFe2O4离子分布通常呈现反铁磁性,而Zn2+替代反型分布铁氧体XFe2O4中的一部分磁性离子X2+形成复合铁氧体ZnαX1-αFe2O4,复合体系中的ZnFe2O4呈现铁磁性。铁氧体的磁性与二价阳离子磁性和分布有关。更多还原

【Abstract】 Polycrystalline NiFe₂O₄,ZnFe₂O₄ and Ni_0.64Zn_0.36Fe₂O₄ were prepared by chemical coprecipitation method.The magnetic properties of the powders were measured at room temperature.The magnetization of single and antiferromagnetic spinel ferrites originated from subferromagnetism which was not counteracted.Usually,the ZnFe₂O₄ of single and positive spinel ferrite exhibited antiferromagnetism.However,if the inverse ferrite XFe₂O₄ was substituted by Zn²⁺,partial cations X²⁺ formed complex ferrite Zn_αX_1-αFe₂O₄.In this complex ferrite,ZnFe₂O₄ showed magnetism.Apparently,the magnetic properties of the spinel ferrites were strongly dependent on the cations distribution and their magnetization.更多还原