(廣西大學(xué) 物理科學(xué)與工程技術(shù)學(xué)院,南寧 530004)
摘 要: 利用電荷離散變分Xα(SCC-DV- Xα)方法計算了ZrMn2和TiMn2及其氫化物的電子結(jié)構(gòu),分析了電子結(jié)構(gòu)對吸氫性能的影響。結(jié)果表明:在ZrMn2氫化物中,H原子與Mn原子的成鍵作用強于H原子與Zr原子之間的相互作用; 在TiMn2H中,H原子也是主要與Mn的3p軌道成鍵,但與Ti的3p軌道也有一定的相互作用;H與Ti的3p軌道的弱鍵作用減弱了H與Mn的3p軌道的相互作用;吸氫使ZrMn2的c軸比a軸更容易產(chǎn)生變化。
關(guān)鍵字: 電子結(jié)構(gòu); 成鍵特征; ZrMn2; TiMn2
JIAN Xiao-ling, GUO Jin
( College of Physics Science and Technology, Guangxi University, Nanning 530004, China)
Abstract: The electronic structures of ZrMn2 and TiMn2,which were applied to analyze the bonding styles between hydrogen and alloying elements in both of ZrMn2 and TiMn2 alloys,were investigated by self-consistent-charge discrete variational Xα method. The results show that hydrogen atom make a strong chemical bond with Mn atom rather than Zr atom and Ti atom in ZrMn2 and TiMn2 hydrides. The c axis of ZrMn2 unit cell can be changed easier than the a axis when hydrogen atom is absorbed.
Key words: electronic structure;bond character; ZrMn2; TiMn2


