LaMg_2Cu_(1-x)Ni_x(x=0～0.90)合金的相结构及储氢性能  

Phase Structure and Hydrogen Storage Property of LaMg_2Cu_(1-x)Ni_x(x=0～0.90) Alloys

作　　者：扈琳[1] 韩树民[1,2] 杨诚[1] 裴立超[1] 

机构地区：[1]燕山大学环境与化学工程学院,秦皇岛066004 [2]亚稳材料制备技术与科学国家重点实验室,秦皇岛066004

出　　处：《无机化学学报》2010年第6期1044-1048,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家高技术研究发展计划(863计划)(No.2007AA05Z117);国家自然科学基金(No.50971112)资助项目

摘　　要：利用真空感应熔炼技术制备了LaMg2Cu1-xNix(x=0,0.10,0.25,0.50,0.75,0.90)合金,并在0.06MPa氩气保护下于723K退火6h得到测试所用合金铸锭。XRD表明合金LaMg2Cu1-xNix含有ThCr2Si2型的LaMg2Cu2相和CeMg3型的LaMg3相以及少量未知相,随着x的增加,LaMg2Cu2相的晶胞体积先增加后减小,而LaMg3相的晶胞体积几乎不变。通过SEM观察,发现Ni可以有效的减小合金在吸放氢过程中的粉化。当x<0.50时,Ni对合金的吸氢速率降低;而当x≥0.50时,Ni的加入可以极大的提高合金的吸氢速率,合金在50s左右就能达到最大吸氢量的90%。当x=0.50时,合金具有较好的综合储氢性能,合金在473K下吸氢量为3.741wt%,49s就可达到最大吸氢量的90%以上。LaMg2Cu1-xNix （x=0, 0.10, 0.25, 0.50, 0.75, 0.90） alloys were prepared by inductive melting and then annealed at 723 K for 6 h in 0.06 MPa argon. XRD showed that alloys consisted mainly of two phases, LaMg3 phase with cubic CeMg3-type structure, LaMg2Cu2 phase with hexagonal ThCr2Si2-type structure and some unknown phases. With increase in Ni content, the cell volume increased first and then decreased. The SEM images showed that addition of Ni restrained pulverization of the alloys. When x0.50, Ni slowed down the rate of hydrogen absorption, and when x≥0.50 Ni accelerated the rate markedly, the uptake time for hydrogen content to reach 90% （t90%） of the maximum storage capacity for the alloys was less than 50 s. When x=0.50 the alloy had the biggest cell volume （0.462 13 nm3）, the hydrogen absorption content was 3.741wt% and t90% was 49 s.

关 键 词：稀土-镁-过渡金属基储氢合金 相结构 P-C-T 吸氢动力学 

分 类 号：O642.5[理学—物理化学] O614.331[理学—化学]