Abstract
Samples of a (Pd0.8Rh0.2)0.97Ce0.03 alloy which had been cold worked and internally oxidized for 72 h at 1073 K were submitted to high hydrogen pressure, at 3.5 GPa for 5 h at 1073 K. The phase transformations were analysed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The X-ray results for the internally oxidized sample revealed the formation of PdO and PdRhO2. In the samples submitted to high hydrogen pressure, it was observed that in both cases, a phase separation had been induced by hydrogen at high temperature, which suggests the formation of Pd-rich hydride phase and a Rh-rich phase. The TEM analysis of these samples revealed the formation of a Rh-Pd phase, which presented some faceted semi-coherent interfaces with Pd matrix. The formation of this ordered compound, which possesses Rh3Pd stoichiometry, is attributed to hydrogen induced vacancies in the alloy.
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