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研究了还原-扩散法合成LaNi_5、LaNi_(4.5)Mn_(0.5)和LaNi_(4.5)Cu_(0.5)金属间化合物的适宜条件,同时合成出La_(0.5)Ca_(0.5)Ni_(4.5)Mn_(0.5)金属间化合物。产物用X-射线粉末衍射进行了物相分析和化学分析测定了组成。以不同溶液冼涤合成产物时,发现LaNi_5、LaNi_(4.5)Mn_(0.5)、LaNi_(4.5)Cu_(0.5)的化学性质较稳定,用0.1MHCl洗涤后未见结构发生变化;而La_(0.5)Ca_(0.5)Ni_(4.5)Mn_(0.5)的化学性质较活泼,用0.1MHCl洗涤后结构发生变化。此外,从样品活化处理前、后X-射线衍射峰的宽度变化中发现,活化处理后晶粒在(110)晶面垂直方向的破碎度大于(101)晶面。
The suitable conditions for the synthesis of LaNi_5, LaNi_ (4.5) Mn_ (0.5) and LaNi_ (4.5) Cu_ (0.5) intermetallic compounds were investigated by reduction-diffusion method and the effects of La 0.5 Mg 0.5 Ni 4.5 Mn 0.5 0.5) Intermetallic compounds. The product was subjected to phase analysis and chemical analysis by X-ray powder diffraction to determine the composition. The chemical properties of LaNi_5, LaNi_ (4.5) Mn_ (0.5) and LaNi_ (4.5) Cu_ (0.5) were found to be stable when washed with different solutions. No structural change was observed after washing with 0.1M HCl. ) The chemical properties of Ca 0.5 Ni 4.5 Mn 0.5 were more active, and their structures changed after washing with 0.1M HCl. In addition, it is found from the change of the width of the X-ray diffraction peaks before and after the sample activation treatment that the degree of fragmentation of the (110) crystal plane in the vertical direction of the (110) crystal plane after the activation process is larger than that of the (101) crystal plane.