INFLUENCE OF TEMPERATURE AND PRESSURE ON THE KINETICS OF Mg-6mol%LaNi PREPARED BY HYDRIDING COMBUSTION SYNTHESIS

作     者：Q. Li K.C. Chou K.D. Xu L.J. Jiang J.Y. Zhang X.G. Lu 

作者机构：School of Materials Science and Engineering Shanghai University Shanghai 200072 China Department of Physical Chemistry University of Science and Technology Beijing Beijing 100083 China General Research Institute for Nonferrous Metals Beijing 100088 China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2006年第19卷第2期

页      面：124-132页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：the Science and Technology Committee of Shanghai (No. 0452NM002) Postdoctoral Science Foundation of China (No. 2004036009) the National Natural Science Foundation of China (No. 50274008) Shanghai Postdoctoral Science Foundation (No. 04R214120) 

主　　题：powder metallurgy hydrogen storage materials kinetics 

摘      要：A new model to study the hydriding/dehydriding （H/D） kinetic mechanism has been applied in the two-phase （α-β） region of the Mg-6mol%LaNi composite at temperature and pressure ranging from 523 to 623K and 0.256 to 0.992MPa H2. respectively. The coincidence of the theoretical calculation with the experimental data indicates that the rate-limiting step is hydrogen diffusion in the β phase for hydriding process and the diffusion of hydrogen in the α solid solution for hydrogen desorption with activation energies 89500 and 87900J/mol H2 for HID processes, respectively, which were much smaller than those of MgH2 and can be attributed to the La and Ni additions.