Research on the kinetics isotope effects of titanium hydride and titanium deuteride desorbed

P-t curves of titanium hydride and titanium deuteride desorbing hydrogen and deuterium are investigated at 350-550 degree C by using the method of reaction rate analysis in a constant volume system. The rate constants of titanium hydride desorbing hydrogen and titanium deuteride desorbing deuterium on different temperature are determined and the activation energy value obtained by this method are 27.1 ± 0.4 kJ/mol and 42.3 ± 1.9 kJ/mol respectively. The activation energy value of titanium deuteride desorbing deuterium is higher than that of titanium hydride desorbing hydrogen, which shows remarkable desorbing kinetics isotope effects and it also proves that titanium deuteride is steadier than titanium hydride. (authors)