Abstract
The application-relevant AB 5-type intermetallic compounds LmNi 4.85Sn 0.15, LmNi 4.49Co 0.1Mn 0.205Al 0.205 and LmNi 4.08Mn 0.62Al 0.1Co 0.2 underwent about 90 000 thermally induced hydrogen absorption–desorption cycles in closed systems at different cycling temperatures and pressures. Depending on the individual rates of decay, regeneration procedures were carried out several times. After the half time and after the end of cycling additional experimental techniques were employed in order to determine possible structural and stoichiometric changes. Among these X-ray powder diffractometry, magnetization, scanning electron microscopy including EDX and thermal desorption spectroscopy were utilized. Besides the degradation behaviour of each material, new results are presented about the degradation phenomena (structural changes, disproportionation) and a comparison is given of various regeneration procedures.
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