ABSTRACT
Transmission electron microscopy has been used to characterize titanium-hydrogen compounds. Imaging and electron diffraction allow us to identify morphology and lattice parameters of reference samples (α and β-phases in titanium, TiH, TiH2), while electron energy loss spectroscopy (EELS) has revealed an increase in the bulk plasmon frequency with hydrogen content. By considering hydrogen insertion in the lattice as an increase in the free-electron density, a relationship between hydrogen content and plasmon frequency can be established, from which the hydrogen concentration in Ti-Hx solid solutions can be evaluated up to the solubility limit.
