不同方法制备的前驱物对水热合成Zn_(0.95)Ni_(0.05)O稀磁半导体粉体的影响  

EFFECTS OF PRECURSORS PREPARED USING DIFFERENT METHODS ON HYDROTHERMALSYNTHESIS OF Zn_(0.95)Ni_(0.05)O DILUTED MAGNETIC SEMICONDUCTOR POWDER

作　　者：李慧勤[1] 苗鸿雁[2] 谈国强[2] 

机构地区：[1]宝鸡文理学院化学化工系,陕西宝鸡721013 [2]陕西科技大学材料科学与工程学院,西安710021

出　　处：《硅酸盐学报》2010年第5期863-867,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50672055V);国家科技支撑计划(2006-BAF02A28)资助项目

摘　　要：分别用沉淀法和溶胶–凝胶法制备Zn0.95Ni0.05O前驱物,然后以3mol/LNaOH作为矿化剂,采用水热法在240℃保温24h合成制备了Zn0.95Ni0.05O稀磁半导体粉体。采用X射线衍射、场发射扫描电镜、能谱仪和振动样品磁强计分析了合成粉体的物相组成、形貌、元素含量和铁磁性能。结果表明:用溶胶–凝胶法制备前驱物所合成的Zn0.95Ni0.05O粉体中有杂相Ni和Ni(OH)2出现。用沉淀法制备前驱物可以合成纯净的Zn0.95Ni0.05O粉体,样品中Ni离子的实际掺杂量为4.55%(摩尔分数)。Zn0.95Ni0.05O样品在室温下有良好的磁滞回线,表现出铁磁性。Zn0.95Ni0.05O precursors were prepared by precipitation and sol–gel methods, respectively, and then Zn0.95Ni0.05O diluted magnetic semiconductor powder was synthesized by hydrothermal method at 240 ℃ for 24 h using 3 mol/L NaOH as mineralizer and the precursors as raw material. The phase composition, morphology, element contents and ferromagnetic properties of the Zn0.95Ni0.05O powder samples were investigated by X-ray diffractometer, field emitted scanning electron microscopy, energy disperse spectroscopy and vibrating sample magnetometer. The results show that there are some impurities such as Ni and Ni（OH）2 in the Zn0.95Ni0.05O powder sample synthesized with the precursor prepared via sol–gel method, while the Zn0.95Ni0.05O powder sample synthesized with the precursor prepared via precipitation method has the pure ZnO wurtzite structure. The mole fraction of true doping Ni2＋ in the semiconductor sample is 4.55%. The Zn0.95Ni0.05O powder sample synthesized with the precursor prepared via precipitation method has a good magnetization hysteresis loop at room temperature and reveals ferromagnetic properties.

关 键 词：掺镍氧化锌粉体 稀磁半导体 水热法 沉淀法 溶胶–凝胶法 前驱物制备 铁磁性 

分 类 号：O781[理学—晶体学]