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Enhanced Tantalum Hydride Formation by the Catalytic Effect of Tungsten for Hydrogen Dissociation

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We investigated enhanced tantalum (Ta) hydride formation by using the catalytic effect of tungsten (W) to reduce the hydrogen dissociation energy. Ta turning scrap was hydrated at various temperatures by using a W crucible and conventional Al2O3 crucible, and the structural and chemical properties of the hydrated powders were compared. Structural investigation by X-ray diffraction and chemical analysis using an oxygen–nitrogen–hydrogen determinator showed that the Ta hydride was formed at temperatures lower than 500 °C, while the dehydride formation process occurs at temperatures higher than 600 °C in conventional Al2O3 crucibles. However, when the W crucible is used, the hydrogen incorporation into the Ta lattice was enhanced at both low and high temperatures. This enhancement was attributed to the reduced energy of dissociation of H2 into mono-atomic H because of the catalytic effect of W, finally resulting in enhanced Ta hydride formation.
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Keywords: CATALYTIC EFFECT; HYDRIDE–DEHYDRIDE; TANTALUM; THERMODYNAMICS; TUNGSTEN

Document Type: Research Article

Publication date: December 1, 2017

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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