Synthesis of lutetium hydrides at high pressures  

作　　者：Yuan-Ao Peng Han-Yu Wang Fu-Hai Su Pu Wang Hai-An Xu Lin Liu Lun-Xuan Yu Ross T.Howie Wan Xu Eugene Gregoryanz Xiao-Di Liu 

机构地区：[1]University of Science and Technology of China,Hefei 230026,China [2]Key Laboratory of Materials Physics,Institute of Solid State Physics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China [3]Centre for Science at Extreme Conditions and School of Physics and Astronomy,University of Edinburgh,Edinburgh EH93FD,United Kingdom [4]Center for High Pressure Science and Technology Advanced Research,Shanghai 201203,China

出　　处：《Matter and Radiation at Extremes》2025年第1期98-104,共7页极端条件下的物质与辐射(英文)

基　　金：supported by research grants of the Youth Innovation Promotion Association of CAS(Grant No.2021446);the National Science Foundation of China(Grant Nos.12204484,51672279,12174398 and 11874361);the Anhui Key Research and Development Program(Grant No.2022h11020007);the HFIPS Director’s Fund of the Chinese Academy of Sciences(Grant Nos.BJPY2022B02,YZJJ202102,YZJJ-GGZX-2022-01,and 2021YZGH03).

摘　　要：High-pressure synthesis of lutetium hydrides from molecular hydrogen(H_(2))and lutetium(Lu)is systematically investigated using synchrotron X-ray diffraction,Raman spectroscopy,and visual observations.We demonstrate that the reaction pathway between H_(2)and Lu invariably follows the sequence Lu→LuH_(2)→LuH_(3)and exhibits a notable time dependence.A comprehensive diagram representing the formation and synthesis of lutetium hydrides as a function of pressure and time is constructed.Our findings indicate that the synthesis can be accelerated by elevated temperature and decelerated by increased pressure.Notably,two critical pressure thresholds at ambient temperature are identified:the synthesis of LuH_(2)from Lu commences at a minimum pressure of~3 GPa,while~28 GPa is the minimum pressure at which LuH_(2)fails to transform into LuH_(3)within a time scale of months.This underscores the significant impact of temporal factors on synthesis,with the reaction completion time increasing sub-linearly with rising pressure.Furthermore,the cubic phase of LuH_(3)can be obtained exclusively through compressing the trigonal LuH_(3)phase at~11.5 GPa.We also demonstrate that the bandgap of LuH_(3)slowly closes under pressure and is noticeably lower than that of LuH_(2).

关 键 词：SYNTHESIS AMBIENT representing 

分 类 号：TQ133.3[化学工程—无机化工] O469[理学—凝聚态物理]