锆-氘反应热力学特性研究

The p-c-T curves and the relation between equilibrium pressure and temperature of deuterium absorption and desorption from zirconium were measured in the temperature range of 400～675 ℃. Equilibrium pressure of the absorption and desorption at different temperatures were given and then the thermodynamic parameters and the deuterium absorption capacity were determined according to Vant Hoff equation. There are different changes of enthalpy and entropy when zirconium changes to different phases. The change of enthalpy in the phase of α plus δ is -98.9 kJ·mol^-1 in the temperature range of 400～475 ℃. The changes of enthalpy in the first and second plateau are -75.1 kJ·mol^-1 and -161.7 kJ·mol^-1, respectively in the temperature range of 525～675 ℃. The corresponding changes of entropy are -66.5 J·K^-1·mol^-1, -32.4 J·K^-1·mol^-1 and -146.5 J·K^-1·mol^-1, respectively. There are obvious lagging effects when zirconium desorbs deuterium.

Thermodynamic Characteristics of Zirconium-deuterium Reaction