中文摘要：

以FeCl2,Zn（NO3）2,Ni（NO3）2为原料,利用化学沉淀法制得了针状纳米α-FeOOH,并借助针状α-FeOOH做为中间体,采用柠檬酸法在针状纳米α-FeOOH表面包裹镍和锌的柠檬酸络合物后,于不同温度煅烧后制得了针状纳米NixZn1-xFe2O4.利用红外光谱仪（IR）、X射线衍射技术（XRD）、透射电子显微镜（TEM）对样品的物相﹑晶格常数、形貌和粒径进行表征,并利用振动样品磁强计（VSM）对样品进行磁性能研究.结果表明：利用化学沉淀-柠檬酸法制得的Ni-Zn铁氧体样品保持了中间体α-FeOOH的针状形貌,所得样品的直径在40nm左右,长度约600nm,长径比大于15.随着煅烧温度的升高样品直径有所增加,长径比下降,随着x值的增加,NixZn1-xFe2O4样品的晶格常数a从0.8442（x=0）逐步减少到0.8353（x=1.00）,矫顽力（Hc）从63.5Oe（x=0）逐步增加到358.7Oe（x=1）,饱和磁化强度（Ms）先增加后减小,当x=0.6时达到最大为58.9emu/g.与相似条件时制备的不定型NixZn1-xFe2O4相比,由于针状NixZn1-xFe2O4的各向异性增大,而表现出明显的硬磁性.

英文摘要：

FeCl2,Zn（NO3）2 and Ni（NO3）2 were used as raw material to prepare acicular α-FeOOH via chemical precipitation method.And then used as the intermediate,the acicular α-FeOOH was enwrapped by the citric acid complex of Ni and Zn via citric acid method.Thus the acicular nano-NixZn1-xFe2O4 samples were obtained after the calcinations of the enwrapped α-FeOOH at different temperatures.The phase,the lattice constant,the morphology and the particle size of the samples were characterized by using infrared spectroscopy（IR）,X-ray diffraction（XRD）,and transmission electron microscopy（TEM）.The magnetic properties of the samples were sdudied by vibrating sample magnetometer（VSM）.The results indicated that the Ni-Zn ferrite samples obtained via chemical precipitation-citric acid method maintained the morphology of the α-FeOOH intermediate.The diameter and length of the obtained acicular nano-NixZn1-xFe2O4 were found to be about 40 nm and 600 nm respectively,and aspect ratio was higher than 15.The diameter of the samples increased and the aspect ratio decreased with the increasing of the calcinations temperature.With the increasing of x value,the lattice constant of the NixZn1-xFe2O4 samples ranged from 0.8442（x=0） to 0.8353（x=1.00）,and the coercivity changed from 63.5 Oe（x=0） to 358.7 Oe（x=1）.The saturation magnetization of the sample increased first,and then decreased.The maximum value of the saturation magnetization of the nano-NixZn1-xFe2O4 was up to 58.9 emu/g（x=0.6）.Compared with the amorphous nano-NixZn1-xFe2O4,the anisotropism of the acicular nano-NixZn1-xFe2O4 by the same method was supe-rior.Thus the acicular nano-NixZn1-xFe2O4 exhibited the character of hard magnetic material.