【摘要】 <正> 过渡金属氢化物因与氢能源的利用紧密有关,近年来在国际上引起极大注意。本文提出了吸氢化合物LaNi₅的一种新的合成方法——共沉淀还原法,并详细研究了反应过程。首先通过水溶液反应生成镧镍草酸盐共沉淀,脱水后,该沉淀与氢化钙在950℃反应生成LaNi₅,其晶格参数:a₀=5.003,c₀=3.987。合成LaNi₅具有良好的更多还原

【Abstract】 In this paper a new route to the preparation of LaNi5 by chemical synthetic method is presented.Lanthanum Nickel oxalate was first prepared by coprecipitation reactions from aqueous solutions,and the oxalate formed after dehydration was reduced by CaH2 at 950℃ to give LaNi5.The reaction was studied in detail and the lattice parameters ofLaNi5 were found a0=5.003 A and c0=3.987A.The LaNi5 thus prepared shows excellent absorption ability for hydrogen and the hydride formed has the composition corresponding to LaNi5H6.1The method seems to have general utility for chemical preparation of some transition metal alloys and intermetallic compounds.In this paper a new route to the preparation of LaNi5 by chemical synthetic method is presented.Lanthanum Nickel oxalate was first prepared by coprecipitation reactions from aqueous solutions,and the oxalate formed after dehydration was reduced by CaH2 at 950℃ to give LaNi5.The reaction was studied in detail and the lattice parameters ofLaNi5 were found a0=5.003 A and c0=3.987A.The LaNi5 thus prepared shows excellent absorption ability for hydrogen and the hydride formed has the composition corresponding to LaNi5H6.1The method seems to have general utility for chemical preparation of some transition metal alloys and intermetallic compounds.更多还原