The Kinetic Isotope Effect of Hydrogen Deuterium and Tritium Absorbed and Desorbed by Titanium

p—t curves of hydrogen,deuterium and tritium absorption at 550～750 ℃ and desorption at 350～550 ℃ by titanium were investigated.The rate constants of absorption and desorption for hydrogen,deuterim and tritium on each temperature are determined and the activation energy values obtained by this analysis are(55.6±2.4)kJ·mol-1,(110.2±3.0)kJ·mol-1 and(155.5±3.2)kJ·mol-1 for absorption and(27.1±0.4)kJ·mol-1,(42.3±1.9)kJ·mol-1 and(62.1±1.6)kJ·mol-1 for desorption respectively.The activation energy value of tritium absorption is highest which shows titanium tritiation is hardest.The activation energy value of tritium desorption is highest and it also can prove that titanium tritide is stablest.There are remarkable kinetic hydrogen isotope effects when titanium absorb and desorb hydrogen,deuterium and tritium.

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