Interrupted thermal desorption of TiH2 |
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Authors: | Ch. Borchers T.I. Khomenko A.V. Leonov O.S. Morozova |
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Affiliation: | aInstitute of Material Physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany;bSemenov Institute of Chemical Physics RAS, 4 Kosygin St, 119991 Moscow, Russia;cMoscow State University, Department of Chemistry, Leninskie Gory, 119899 Moscow, Russia |
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Abstract: | Structural changes of commercial TiH2 were studied using interrupted temperature desorption spectroscopy and X-ray diffraction techniques to understand the mechanism of its degradation under non-equilibrium conditions. Rapid cooling on different stages of temperature-programmed heating allowed to study the intermediate phase compositions that evolve upon cooling from the high-temperature phase βTi(H). The phase transformation sequence is described as a number of consecutive reactions corresponding to the observed desorption peaks. Phases δTiH2−x, γTiH, and the solid solution αTi(H) were found to be intermediates in the TiH2 → αTi transformation when the latter is interrupted. Additional evidence for the thermodynamic stability of γTiH is given. |
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Keywords: | Thermal desorption spectroscopy X-ray diffraction Phase stability Titanium monohydride |
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