Experimental Study on Thermophysical and Kinetic Properties of the LaNi₅-H₂ System

Abstract

Thermophysical and kinetic properties of the LaNi₅-H₂ system are investigated for the practical utilization of hydriding alloys. The measurements of the thermophysical properties are carried out by a transient hot-wire method along the P-C isotherms. The effective thermal conductivities of the system increase not only with the increase of the hydrogen gas pressure but also in the plateau region with the increase of the composition of the metal hydride. The specific heats of the metal hydride increase with the increase of the composition. The kinetic properties are measured under the isobaric and the isothermal conditions. The derived intrinsic chemical reaction rates indicate the difference in reaction mechanism between the absorption and the desorption processes.