【摘要】 用化学共沉淀法和在NH3/H2气氛下氮化处理得到了一系列不同Ni含量的Fe-Ni-N多晶粉末。XRD测试的结果表明,随着Ni含量的增加,材料的晶格常数逐渐减小;制备出单相的γ′-(Fe1-xNix)4N条件主要与NH3/H2气流比、热处理温度及时间有关。从VSM测量的结果来看,随着Ni含量的增加,材料的饱和磁化强度(Ms)总体呈下降趋势。Ni含量在0.18-0.28之间较容易得到单相γ′-(Fe1-xNix)4N,并且磁性质比较稳定。通过研究不同Ni含量对磁性的影响,进一步分析了Ni的占位问题。更多还原

【Abstract】 The polycrystalline Fe-Ni-N powders with different nickel concentration were synthesized by chemical co-precipitation method and annealing in NH₃ and H₂ gas atmosphere.The results of X-ray diffraction show the lattice constants decrease with increasing nickel concentration.The condition of preparing single phase γ′-(Fe_1-xNi_x)₄N compounds was included the ratio of NH₃/H₂ gas flow,annealing temperature and duration.The results of VSM show that the saturation magnetization（Ms） trends to decrease with increasing nickel concentration.While nickel concentration range from 0.18 to 0.28,single phase γ′-(Fe_1-xNi_x)₄N was prone to be prepared.According to research about the magnetism of the material with different nickel concentration,nickel space occupying was analyzed furthermore.【更多还原