低热固相反应法合成反尖晶石型Zn_(0.5)Ni_(0.5)Fe_2O_4纳米晶

Synthesis of Nanocrystalline Spinel Zn_(0.5)Ni_(0.5)Fe_2O_4 via Solid-state Reaction at Low Heat

以NiSO4.7H2O,ZnSO4.7H2O,Fe2(SO4)3和NH4HCO3为原料,在表面活性剂PEG-400存在下,先在室温下研磨反应混合物使其进行固相反应,然后用水洗去混合物中的可溶性无机盐后于80℃下烘干,即得纳米晶Zn0.5Ni0.5Fe2O4前驱体。通过煅烧前驱体即得反尖晶石型Zn0.5Ni0.5Fe2O4纳米晶产品。采用TG/DTA,XRD,IR,SEM和VSM对前驱体及其热解产品进行表征。结果表明,800℃下煅烧前驱体3h得到粒径约为35nm的反尖晶石型Zn0.5Ni0.5Fe2O4纳米晶,其比饱和磁化强度为75.4emu/g,矫顽力Hc为40Oe,剩磁Mr为3emu/g。

The nanocrystalline Zn0.5 Ni0.5 Fe2O4 precursor is prepared by grinding mixture of NiSO4·7H2O, ZnSO4 7H2O, Fe2 （SO4）3 and NH4 HCO3 in the presence of surfactant PEG-400 at room temperature, and washing mixture with water to remove soluble inorganic salts and drying at 80℃. The nanocrystalline Zn0.5Ni0.5Fe2O4 with inverse spinel structure is obtained via calcining precursor. The precursor and its calcined products are characterized by using TG/DTA, XRD, IR, SEM, and VSM. The results show that the inverse spinel nanocrystalline Zn0.5Ni0.5 Fe2O4 with 35nm in the size is produced by calcining precursor at 800℃ for 3h, and its saturation magnetization, coercive force （Hc） and remanence （Mr） are 75.4emu/g, 400e and 3emu/g, respectively.