The absorption capacities and rates of hydrogen and deuterium in Zr(Mn0.5Fe0.5)2 are determined in the range of 5 kPa<pH(2)·pD(2)<100 kPa and 273 K<T<473 K by means of a constant volume method. The Sieverts' law holds good in almost the whole range of the Zr(Mn0.5Fe0.5)2-H2 and -D2 system. The isotopic difference in solubility between H and D becomes smaller with an increase in temperature. The relative partial molar enthalpy per gram atom of H is slightly smaller than that per gram atom of D. The absorption rates of H2 and D2 are not explained by previous hydrogenating rate equations but are correlated to a unique dissociation-relating-reaction rate equation regardless of temperature, initial hydrogen pressure and isotopic species. The reaction rates of H2 and D2 are characterized in terms of the time to fill half of the equilibrium absorption amount of the Zr(Mn0.5Fe0.5)2 particles. The half time is a linear function of the reciprocal of temperature independent of the initial pressure.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry