低热固相反应法合成反尖晶石型NiFe₂O₄纳米晶

来源期刊：有色金属2010年第3期

论文作者：吴文伟 侯生益 廖森 王铭钧 吴学航 李姝姝

文章页码：39 - 42

关键词：磁性材料； 铁酸镍； 低热固相反应； 磁性质； 纳米粒子

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

摘    要：以NiSO₄·7H₂O,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NiFe₂O₄前驱体。通过煅烧前驱体即得反尖晶石型NiFe₂O₄纳米晶产品。采用TG/DTA,IR,XRD和VSM对前驱体及其热解产品进行表征。结果表明,400℃下煅烧前驱体2h得到粒径约为17.2nm的反尖晶石型NiFe₂O₄纳米晶,其比饱和磁化强度为32.3emu/g。

Abstract: The nanocrystalline NiFe₂O₄ precursor is prepared with NiSO₄·7H₂O,Fe₂(SO₄)₃ and NH₄HCO₃ as raw materials by grinding mixture 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 NiFe₂O₄ with inverse spinel structure is obtained by calcining the precursor.The precursor and its calcined products are characterized by using TG/DTA,IR,XRD,and VSM.The results show that the inverse spinel nanocrystalline NiFe₂O₄ with 17.2nm in the size is obtained by calcining the precursor at 400℃ for 2h,and saturation magnetization is 32.3emu/g.