【作者】 李良超； 蒋静； 徐烽；

【Author】 LI Liang-chao, JIANG Jing, XU Feng (Department of Chemistry, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China)

【机构】 浙江师范大学化学系物理化学研究所；

【摘要】 用流变相反应法合成了La3+掺杂CuZnCr铁氧体的草酸盐前驱物,热分解前驱物制备了 Zn0.6Cu0．4Cr0.5LaxFe1．5-xO4{x=0．00,0．02,0．04,0．06)铁氧体粉末。用X射线衍射(XRD)、原子力显微镜(AFM)、振动样品磁强计(VSM)以及阻抗-材料分析仪等表征了样品的结构、形貌和磁性能。实验结果表明,La3+掺杂铁氧体具有立方尖晶石结构,当La3+掺杂浓度x>0．04 时,样品中有少量LaFeO3杂相生成。La3+掺杂浓度对样品的磁性能参数影响较大,随着La3+掺杂浓度的增大,饱和磁化强度、剩余磁化强度和矫顽力逐渐减小。样品的磁谱属于共振型频谱,复数磁导率的实部和虚部值随着La3+掺杂浓度的增大而减小。更多还原

【Abstract】 La3+-doped CuZnCr ferrites with the formula Zn0.6Cu0.4Cr0.5LaxFe1.5-xO4 (x=0.00, 0.02, 0.04, 0.06) were prepared by thermolysising of oxalate precursors which were obtained by Theological phase reaction. The structure, morphology and magnetic properties of samples were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), vibrating sample magnetometer (VSM) and impedance-material analyser. The results indicated that La-doped ferrites have the cubic spinel structure. When x is beyond 0.04, there is formation of the small amount of the secondary phase (LaFeO3). The La3+-doped concentration has an effect on the magnetic properties of samples, and the saturation magnetization, remanence and coercivity decrease with increasing the La3+ content. The magnetic spectra of samples is the resonance one, the values of real and imaginary part of complex permeability decrease with increasing the La3+ content.更多还原