Effect of Manganese substitution on hydrogen storage properties of LaNi_(4.25-x)Al_(0.75)Mn_(x) alloy

作     者：JIANG Yuwei LIU Xiaopeng JIANG Lijun WANG Shumao YANG Hongguang JIANG Yuwei1), LIU Xiaopeng1), JIANG Lijun1), WANG Shumao1), and YANG Hongguang2)1) Institute for Energy Materials and Technology, General Research Institute for Non-ferrous Metals, Beijing 100088, China2) China Institute of Atomic Energy, Beijing 102413, China

作者机构：Institute for Energy Materials and TechnologyGeneral Research Institute for Non-ferrous MetalsBeijing 100088China China Institute of Atomic EnergyBeijing 102413China 

出 版 物：《Rare Metals》 (稀有金属(英文版))

年 卷 期：2006年第25卷第Z2期

页      面：204-208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）] 

主　　题：hydrogen storage alloy La-Ni-Al-Mn alloy P-C-T hysteresis and plateau slope 

摘      要：The effect of Mn substitution on phase structure,hydrogen hydriding/dehydriding properties(plateau pressure and slope)and reaction heat enthalpy of LaNi_(4.25-x)Al_(0.75)Mn_(x)alloys(x=0,0.25,0.35,0.45,0.55 and 0.65)were *** experimental results show that all LaNi_(4.25-x)Al_(0.75)Mn_(x)alloys have single phase and have the same hexagonal structure as that of LaNi5 alloy(CaCu_(5)type,P6/mmm).With increasing Mn substitution content,the cell parameters of LaNi_(4.25-x)Al_(0.75)Mn_(x)alloy greatly increase,but the maximum hydrogen storage capacity and the equilibrium absorption pressure of LaNi_(4.25-x)Al_(0.75)Mn_(x)alloy decrease from 1.38 wt.%to 1.18 wt.%and from 1.61 to 0.0712 MPa,***,the hydrogen pressure plateau slope factorσincreases from 0.014 to 0.18,but the hysteresis factor is nearly *** heat enthalpy absolute value|ΔH_(plat)|increases from 46.7 kJ·mol^(-1)H2 to 56.1 kJ·mol^(-1)H_(2)as the Mn content x increases from 0 to 0.65.