利用X射线衍射和高分辨透射电镜(HRTEM) 分析和观测了ZnFe2O4/Fe2O3纳米复相铁氧体的结构，研究了Fe2O对ZnFe2O4/Fe2O3纳米复相铁氧体的结构和磁性能的影响。结果表明: 过量的Fe2O3是在复相锌铁氧体内形成隧道结构和隧道磁电阻(TMR)的必要条件；在复相锌铁氧体中?-Fe2O3位于晶界处，形成隧道结构的绝缘层；复相锌铁氧体具有非线性的伏安曲线和TMR效应；单相锌铁氧体具有线性伏安曲线和一般铁氧体磁电阻效应；复相锌铁氧体的相变动力学表明?-Fe2O3是由晶界或表面控制的析晶。
Two-phase nanostructure ZnFe2O4/Fe2O3 had been prepared by the sol-gel method and heat treatment. The structure had been analyzed by X-ray diffraction (XRD) and high-resolution electron microscope (HREM). The results indicate that superfluous Fe2O3 composition is the necessary condition to form tunneling structure in two-phase ferrite. The tunneling structure was directly observed by HREM in two-phase ferrite and the insulating layer of ?-Fe2O3 located in interface between ferrets. The two-phase ferrite has non-Ohmic character of I-V curve and tunneling magnetoresistance. The one-phase ferrite has linear-Ohmic character of I-V curve and small magnetoresistance of ferrite. Phase-transformation dynamics in two-phase ferrite show that crystallization of ?-Fe2O3 is controlled by interface or surface.
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