%0 Journal Article
%T Shock-induced phase transition of z-cut lithium tantalate single crystal<br>z切LiTaO3单晶的冲击相变研究
%A Li Jun
%A Zhou Xian-Ming
%A Li Jia-Bo
%A Li Sai-Nan
%A Zhu Wen-Jun
%A Wang Xiang
%A Jing Fu-Qian
%A <br>李 俊
%A 周显明
%A 李加波
%A 李赛男
%A 祝文军
%A 王 翔
%A 经福谦
%J 物理学报
%D 2007
%I 
%X High-pressure phase-transition behaviors of z-cut lithium tantalate single-crystal have been studied by Hugoniot measurements at our two-stage light-gas gun and DFT-PWP calculations. A distinct discontinuity was discovered on the D-u (shock-wave velocity versus particle velocity) relation. An elastic-plastic two-wave structure was observed from the VISAR measured particle velocity profiles at low pressures (25.9 GPa and 32.6 GPa), while three-wave structure appeared in the measured particle velocity profiles at the final pressure of 42.9 GPa and 53.0 GPa. Both facts indicate a shock-induced phase transition of LiTaO3 samples occurred with an onset pressure of 37.9GPa. The theoretically calculated 0K pressure versus compression ratio (P-V/V0) curve for the rhombohedral phase (R3c space group) is in good agreement with the low-pressure experimental data, while that for orthorhombic phase (Pbnm space group) is in accord with the results by deducing thermal pressure contribution from the measured shock-compression data at high pressures. This suggests that the high-pressure phase has orthorhombic symmetry. High-pressure phase transformation behaviors including the transition pressure and structures, which are unclear in current literature, have been clarified in this paper by our new shock-wave data and ab-initio calculations. These behaviors were demonstrated to be in close similarity with that of its isomorphous crystal LiNbO3. The present work is significant for the investigations of shock-induced phase-transition of similar single-crystal materials.
%K z_cut LiTaO3 single-crystal
%K shock-induced phase-transition
%K shock_wave experiment
%K ab-initio calculation<br>z-切LiTaO3
%K 冲击诱导相变
%K 冲击波实验
%K 第一性原理计算
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=1A7F80CA21754FB474F6FAE21B438787&yid=A732AF04DDA03BB3&vid=014B591DF029732F&iid=708DD6B15D2464E8&sid=82276EB09EB91C90&eid=FFA1549B3FC1F64D&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=37