Observation of metastable erbium trihydride |
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Authors: | Craig R. Tewell Saskia H. King |
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Affiliation: | Sandia National Laboratories, P.O. Box 5800, MS 0867, Albuquerque, NM 87185-0867, USA |
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Abstract: | The γ phase of the erbium-hydrogen system is a hexagonal trihydride that is not predicted to be stable at room temperature without an overpressure of hydrogen gas. Herein, we report the creation of both, a thin film and powder of erbium trihydride that is metastable at ambient conditions. The presence of the hexagonal γ phase was determined by X-ray diffraction (XRD). The ratio of the total moles of hydrogen isotopes (hydrogen and deuterium) to moles of erbium, (H + D):Er, have been confirmed by elastic recoil detection (ERD)/Rutherford backscattering spectroscopy (RBS). Auger electron spectroscopy (AES) depth profiles and X-ray photoelectron spectroscopy (XPS) revealed the presence of an oxide layer that may account for the metastable behavior of the thin film. |
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Keywords: | Hydrogen storage materials Surfaces and interfaces Thin films Gas-solid reactions Photoelectron spectroscopy |
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