The adsorption, bonding, defect formation, and reactivity of hydrogen on different In 2 O 3 powder samples were studied by a combination of volumetric adsorption, thermal desorption, diffraction, and spectroscopic techniques. Surface reduction was observed in dry hydrogen up to 400 K, followed by reduction of surface-near regions. Above 500 K bulk reduction, along with the formation of metallic In, sets in. Raman spectra indicate a considerable reordering of the In 2 O 3 structure in this temperature regime. Despite their TPD proven presence, the related adsorbed H-containing species were not detectable by Fourier transform infrared spectroscopy and/or Raman spectroscopy, in strong contrast to related experiments on β-Ga 2 O 3 . Hydrogen-induced oxygen vacancies were found to be easily replenished by traces of water in the gas feed.
No takes yet. Share an insight, caveat, or question.
Bielz et al. (2010) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: