低热固相反应法合成反尖晶石型Zn_0.5Ni_0.5Fe₂O₄纳米晶

来源期刊：有色金属2010年第4期

论文作者：吴文伟 侯生益 吴学航 李姝姝 廖森 南温暖

文章页码：18 - 21

关键词：磁性材料； 铁酸镍锌； 低热固相反应； 纳米粒子； 磁性质

Key words：magnetic material； zinc and nickel ferrite； solid-state reaction at low heat； nanoparticles； magnetic properties

摘    要：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Zn_0.5Ni_0.5Fe₂O₄前驱体。通过煅烧前驱体即得反尖晶石型Zn_0.5Ni_0.5Fe₂O₄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Zn_0.5Ni_0.5Fe₂O₄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。

Abstract: The nanocrystalline Zn_0.5Ni_0.5Fe₂O₄ precursor is prepared by grinding mixture of NiSO₄·7H₂O,ZnSO₄·7H₂O,Fe₂(SO₄)₃ and NH₄HCO₃ 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 Zn_0.5Ni_0.5Fe₂O₄ 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 Zn_0.5Ni_0.5Fe₂O₄ 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,40Oe and 3emu/g,respectively.