热解吸法评价铒氢化物晶体结构的热稳定性  

Evaluating Thermal Stability of Erbium Deuteride Crystal Structure From Thermal Desorption Spectra

作　　者：王维笃[1] 彭述明[1] 梁建华[1] 周晓松[1] 程贵钧[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《原子能科学技术》2014年第5期797-800,共4页Atomic Energy Science and Technology

摘　　要：文章介绍了铒氢化物的热力学特性研究进展,实验测定了铒三氘化物的热解吸谱,建立了热解吸谱峰与晶体精细结构的对应关系,发现并确认了铒氘化物中氘原子占据CaF2型面心立方结构(fcc)八面体间隙(βOct)和四面体间隙位置(βTet)时的氘释放峰。采用Redhead模型计算得到了γ+β相、βOct相和βTet相铒氘化物解吸氘的表观活化能,其值分别为(178.3±3.0)、(204.5±1.2)和(309.2±0.6)kJ/mol。结果显示,相结构对铒氘化物的热稳定性具有显著影响。提出了基于实验热解吸谱和Redhead理论模型来评估升温速率影响金属氢化物热解吸特性的方法,采用该方法可大幅减少实验工作量。The investigation progress on the thermodynamic characteristics of erbium hydride was introduced .In order to verify the thermal stability of erbium deuteride ,the thermal desorption spectra （ TDS ） of erbium trideuterie were experimentally menstruated ,and the corresponding relations of fine structure and TDS peaks of erbium deuteride were established . The deuterium release peaks of deuterium located at the octahedral interstice （βOct ） and tetrahedral interstice （βTet ） of face-centered cubic （fcc） framework of the fluorite-type lattice have been especially found .The activation energy of γ＋ β,βOct and βTet phases erbium deuteride decomposition were calculated from the Redhead’ s thermal desorption model , and the calculated values are （178.3 ± 3.0 ） , （204.5 ±1.2） and （309.2±0.6） kJ/mol ,respectively .The results show that phase structure has a significant influence on the thermal stability of erbium deuteride . A novel method to evaluate the impact of heating rate parameter on the thermal desorption characteristics of metal hydride is proposed . It is a method based on the thermal desorption experimental test and theoretical simulation using Redhead’s model .Using this method can greatly reduce the workload of the experiment .

关 键 词：金属氢化物 热解吸谱 物相 晶体结构 热稳定性 

分 类 号：O795[理学—晶体学]