Non-Isothermal Decomposition of As-Received and Oxidised TiH₂ Powders

Abstract

As-received and oxidised TiH₂ powders have been characterised using differential scanning calorimetry, thermogravimetry and mass spectrometry. The activation energy for hydride decomposition was determined and was found to increase slightly (from 119 kJ/mol to 134 kJ/mol) after oxidation. These values are much higher than those for hydrogen diffusion (typically 50 kJ/mol) indicating that the rate of hydrogen release, before and after oxidation, is controlled by detrapping.