Effect of Applied External Stress on Hydrogen Desorption from Metal Hydrides
The effect of hydrostatic pressure mechanically applied to hydride on the equilibrium hydrogen gas pressure and temperature have been examined theoretically. From free energy calculations where elastic energy is taken into account, equilibrium gas pressure and temperature increases and decreases with increasing applied compressive stress, respectively. In the case of magnesium hydride, equilibrium temperature decreases to 63 °C at the hydrogen gas pressure being 1 atom when volume expansion at hydriding is perfectly suppressed by an external compressive stress. The temperature is remarkably lower than that obtained by alloying various elements.
Young Won Chang, Nack J. Kim and Chong Soo Lee
R. Matsumoto et al., "Effect of Applied External Stress on Hydrogen Desorption from Metal Hydrides", Advanced Materials Research, Vols. 26-28, pp. 217-220, 2007