Investigation on the Characteristics of Titanium-tritium Reaction Ⅰ.Characteristics of Thermodynamics

The P-C-T curves and the relation between equilibrium pressure and temperature of tritium absorption and desorption for Ti are measured at 523,773,798 and 823 K.Equilibrium pressure of the absorption and desorption at different temperature of Ti are given and then the thermodynamic parameters and the tritium absorption capacity are calculated according to Van't Hoff equation.There are different changes enthalpy and entropy for titanium in different phases.The enthalpy and entropy changes are(-101.5±1.9) kJ/mol and((165.3±1.9)) J/(K·mol) in the first plateau and((-179.6±5.6)) kJ/mol and(290.3±7.1)(J/(K·mol)) in the second plateau,respectively.