Phase-structural transformation of erbium trihydride studied by thermal desorption spectroscopy

Thermal desorption behaviours of erbium trihydride (ErH3) powders were studied using simultaneous thermogravimetry and thermal desorption spectroscopy (TG-TDS) method. The crystal structures and chemical compositions of the samples were investigated by X-ray diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. Two-peak structures were observed in the hydrogen desorption spectra and the corre-sponding activation energies were determined to be 160.7 and 212.3 kJ/mol, respectively. The phase transformation sequences during thermal desorption process were established by combining the changing trends in the temperature/hydrogen content with the Er-H phase diagram. It was established that the low-temperature and high-temperature peaks were related to the J3 + g-> J3 and a + J3-> a phase transformation steps, respectively. The origins of the observed TDS peaks and shoulders were attributed to the equilibrium hydrogen pressures of the phase regions that the decomposition reaction passed through. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

The thermal desorption behaviors of erbium trihydride (ErH3) powders were studied using simultaneous thermogravimetry and thermal desorption spectroscopy (TG-TDS) method. The crystal structures and chemical compositions of the samples were investigated by X-ray diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The phase transformation sequences and the origins of the observed peaks and shoulders were determined.