Thermal desorption spectra of hydrogen in HfV 2H x and ZrV 2H x

Abstract

The thermal desorption spectroscopy of hydrogen in hydrides is a new technique in which the rate of desorption is measured as a function of temperature and the temperature is increased with time. We present the thermal desorption spectra of HfV 2H x and ZrV 2H x for various initial hydrogen concentrations. The spectra for both hydride systems develop from one peak at low initial hydrogen concentrations to at least three peaks at the highest measured hydrogen concentration. The activation energies for desorption and the pre-exponential factors are derived from the Arrheniuslike initial region of the spectra. The results are compared with neutron diffraction and nuclear magnetic resonance data and are discussed in terms of a model suggested previously.