Abstract

In situ X-ray diffraction at high pressure (5 GPa) and high temperatures (less than or approximately 1100 °C) of the TiH system revealed that two different kinds of phase transition take place at high hydrogen concentrations. [H]/[Ti] ≳ 2, a reversible transition due to absorption-desorption of hydrogen and an irreversible transition due to the formation of metal-atom vacancies. The general implication of the formation of defect-hydride phases in the phase diagrams of MH systems is discussed.

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