%0 Journal Article
%T First principles studies of low-compressibility of transition-metal compounds OsB2 and OsO2<br>过渡金属化合物OsB2与OsO2低压缩性的第一性原理计算研究
%A Liang Yong-Cheng
%A Guo Wan-Lin
%A Fang Zhong
%A <br>梁拥成
%A 郭万林
%A 方 忠
%J 物理学报
%D 2007
%I 
%X By the first principles plane-wave pseudopotential calculations based on the density functional theory, we studied the equations of states and structural properties of transition metal compounds OsB2 and OsO2 and the possible high pressure phase transitions of OsO2. Three (rutile, pyrite and fluorite) phases of OsO2 are studied under high pressure. The calculated results support the opinion that OsB2 and the fluorite phase of OsO2 should be potential ultralow-compressible hard materials. The microscopic mechanism of large bulk modulus and high hardness can be understood from the calculated electronic structures. It is therefore suggested that incorporating light elements (boron, oxygen, carbon or nitrogen) into transition metals with high valence electron densities is possibly a new way to prepare superhard materials.
%K transition metal compounds
%K density functional theory
%K low-compressibility
%K high-pressure<br>过渡金属化合物
%K 密度泛函理论，
%K 低压缩性，
%K 高压
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=99F645DE6B9870AB&yid=A732AF04DDA03BB3&vid=014B591DF029732F&iid=5D311CA918CA9A03&sid=EAB7EBBF96D8EEB7&eid=8586AA25CFB85267&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=37