Ti-Mo合金氘化物热解吸过程研究  

Thermal Desorption of Ti-Mo Alloy Deuterides

作　　者：王伟伟[1] 龙兴贵[1] 黄刚[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：《同位素》2008年第4期193-197,共5页Journal of Isotopes

摘　　要：采用非零初压热解吸法研究了不同钼含量的钛钼合金TiMo_x(x=0.03、0.13、0.25、0.50、1.00,Mo与Ti原子数之比)氘化物的热解吸动力学,测试了氘解吸量与解吸时间的关系,应用反应速率分析方法得到了其热解吸速率常数k_d和热解吸表观活化能E_d;并与氕化物的热解吸动力学行为进行了比较。结果显示,x=0.03时,合金氕化物E_d小于氘合金化物E_d,与钛放氢动力学同位素效应一致;x=0.13、0.25时,氕化物E_d大于氘化物E_d;x=0.50、1.00时,氕化物与氘化物的E_d差别不大。通过初始解吸时合金中氕、氘含量的比较,结合室温下合金吸氕、氘量及物相结构,对合金放氢动力学同位素效应的本质进行了探讨。The desorption kinetics of TiMox alloy deuterides with different Mo contents （x= 0.03, 0.13, 0.25, 0.50, 1.00, atomic ratio） were studied in an ultra-high vacuum system by applying the constant volume method. The rate constant of desorption kd, is calculated by first-order rate analysis, and the desorption activation energy Ed is obtained from the relationship lnka vs 1 000/T. To investigate the kinetic isotope effect of Ti-Mo alloy hydrides, Ed of the deuterides is compared with that of the protides. When x=0.03, Ed of deuterium desorption is larger than that of protium desorption. When x-=0.13 and 0.25, Ea of protium desorption is larger than that of deuterium desorption. When x=0.50, 1.00, the kinetic isotope effect is not obvious. The nature of the kinetic isotope effect is discussed by the stability of deuterides and hydrides at various temperatures.

关 键 词：Ti—Mo合金 氘化物 放氢动力学 同位素效应 

分 类 号：O614.41[理学—无机化学]