Synthesis and reactivity of single-phase Be 17 Ti 2 intermetallic compounds
| Autor: | Hirotomo Iwakiri, Masaru Nakamichi, Jae-Hwan Kim, Tatsuaki Furugen |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Exothermic reaction
Materials science Hydrogen Scanning electron microscope Annealing (metallurgy) Mechanical Engineering Intermetallic Sintering chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Endothermic process 010305 fluids & plasmas Nuclear Energy and Engineering chemistry 0103 physical sciences Physical chemistry General Materials Science 0210 nano-technology Stoichiometry Civil and Structural Engineering |
| Zdroj: | Fusion Engineering and Design. 102:44-49 |
| ISSN: | 0920-3796 |
| Popis: | To investigate feasibility for application of Be17Ti2 as a neutron multiplier as well as a refractory material, single-phase Be17Ti2 intermetallic compounds were synthesized using an annealing heat treatment of the starting powder and a plasma sintering method. Scanning electron microscopic observations and X-ray diffraction measurements reveal that the single-phase Be17Ti2 compounds were successfully synthesized. We examined the reactivity of Be17Ti2 with 1% H2O and discovered that a larger stoichiometric amount of Ti resulted in the formation of TiO2 on the surface at high temperatures. This oxidation may also contribute to an increase in both weight gain and generation of H2. This suggests that the formation of the Ti-depleted Be17Ti2−x layer as a result of oxidation facilitates an increased reactivity with H2O. To evaluate the safety aspects of Be17Ti2, we also investigated the hydrogen positions and solution energies based on the first principle. The calculations reveal that there are 10 theoretical sites, where 9 of these sites have hydrogen solution energies with a positive value (endothermic) and 1 site located at the center of a tetrahedron comprising two Be and two Ti atoms gives a negative value (exothermic). |
| Databáze: | OpenAIRE |
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