Effect of hydrogenation on the crystal structure of La 2Pd 2In

Abstract

The paper is focusing on the modification of the crystal lattice upon the hydrogenation of La 2Pd 2In and hydrogen desorption from La 2Pd 2In hydrides. The synthesis at 1 bar of hydrogen produces a crystalline hydride with 1.5 H atoms per formula unit and the volume expansion of Δ V/ V = 6.0%. The synthesis at 10 and 100 bar H 2 pressures leads to an amorphous state and with 4 + δ H atoms/f.u. The uptake of hydrogen leads to the decrease of the Debye temperature of La 2Pd 2In and modification of the optical phonon spectrum.