Li_3N的合成及吸放氢性能研究  

Study of synthesis of Li_3N and its hydrogen absorption/desorption properties

作　　者：罗永春[1] 唐朝辉[1] 李宗厚[1] 阎汝煦[1] 康龙[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2007年第1期9-13,共5页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(3ZS041-B25-017)

摘　　要：采用金属锂和氮气实验合成了Li3N,对Li3N在不同温度下的吸氢性能进行了研究.通过X射线衍射数据的Rietveld全谱拟合精修及储氢实验,从相转变和吸氢量方面进行分析.实验表明,随温度的升高,Li3N转化为Li2NH和LiNH2的程度增加,到400℃时反应基本完成,吸氢质量分数达到了9.50%.对400℃充分氢化后的产物进行放氢TG/DTA热分析,研究表明,以3K/min和8K/min升温至400℃并保温1h后,试样放氢量的吸热峰值分别出现在354.1℃和360.1℃处,放氢时失重质量分数分别达到6.54%和6.58%.Li3N was synthesized experimentally, and the hydrogen absorption properties for Li3N at various temperatures were studied. Its phase transition and hydrogen absorption amount were analyzed with Rietveld refinement method and hydriding experiment. As temperature increasing, the transition degree of Li3N into Li2NH and LiNH2 also increased, and terminated at 400 ℃, where the mass percentage of hydrogen adsorption amounted to 9. 50%. TG/DTA thermal analysis of hydrogen desorption at 400 ℃ after full hydrogenation of Li3N was carried out and it was shown that, with 3 K/min and 8 K/min heating rate, the samples heated to 400 ℃ and kept thus for an hour would have two endothermic peaks at 354. 1 ℃ and 360 ℃. And the mass fraction of weight loss was 6.54% and 6.58%.

关 键 词：贮氢材料 Li3N Rietveld分析 吸氢量 TG/DTA热分析 

分 类 号：TG146.4[一般工业技术—材料科学与工程]