Micro study of the structural modifications induced by absorption of hydrogen in LaNi4.25Co0.75

Many intermetallic elements (rare earth gold transition metals) have significant properties that will affect the adsorption of hydrogen. Within the properties, particularly of those composed of ABn, hydrogenation is affected by temperature and environmental pressure. Moreover, the reaction can also be done in electrochemical medium. These remarkable properties made it possible to develop batteries of standard nickel hydride which today largely replace the Nickel Cadmium batteries. However, mechanisms brought into play at an atomic scale during the cycles of absorption-desorption are still badly known. We present here a study by X-ray diffraction of substitute compositions for LaNi4.25Co0.75 cobalt subjected to the absorption effects of hydrogen. The evolutions of profile E lines of elements before and after cycling are studied and compared