TY - JOUR T1 - X-Ray Absorption Spectroscopy of Transition Metal-Magnesium Hydride Thin Films JF - Journal of Alloys and Compounds Y1 - 2003/08// SP - 204 EP - 207 A1 - Thomas J. Richardson A1 - Baker Farangis A1 - Jonathan L. Slack A1 - Ponnusamy Nachimuthu A1 - Rupert C.C. Perera A1 - Nobumichi Tamura A1 - Michael D. Rubin KW - EXAFS KW - Hydrogen storage materials KW - NEXAFS KW - thin films KW - x-ray diffraction AB - Mixed metal thin films containing magnesium and a first-row transition element exhibit very large changes in both reflectance and transmittance on exposure to hydrogen gas. Changes in electronic structure and coordination of the magnesium and transition metal atoms during hydrogen absorption were studied using dynamic in situ transmission mode X-ray absorption spectroscopy. Mg K-edge and Ni, Co, and Ti L-edge spectra reflect both reversible and irreversible changes in the metal environments. A significant shift in the nickel L absorption edge shows it to be an active participant in hydride formation. The effect on cobalt and titanium is much less dramatic, suggesting that these metals act primarily as catalysts for formation of magnesium hydride. VL - 356-357 U1 -

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U2 - LBNL-50574 DO - 10.1016/S0925-8388(02)01237-9 ER -