Hydrogen absorption characteristics and structural transformation during the hydrogenation process of Er3Ni

► The hydrogenation process of Er3Ni and its thermochemical properties are discussed. ► The p-c-T relations for hydrogen absorption of Er3Ni are measured. ► The hydrogen absorption-desorption characteristics of Er3Ni are analyzed. ► The X-ray diffraction method is used to measure the structure of Er3Ni hydride. ► The thermophysical properties of the hydrides are calculated by p-c-T and DSC methods.