Microwave-assisted selective preparation and characterization of Li21Si5 and Li17Sn4 |
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| Authors: | Gen-Tao Zhou Oleg Palchik R. Herber Aharon Gedanken |
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| Affiliation: | a Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israelb School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, People's Republic of Chinac Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel |
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| Abstract: | Two types of intermetallic lithium alloys, Li21Si5 and Li17Sn4 (previously Li22Si5 and Li22Sn5), were prepared for the first time using microwave-assisted solid-state reaction. The optimum oven power for their preparation is 80-60%, and the irradiation times are 5 min for Li21Si5 or 10 min for Li17Sn4. A cheap alumina crucible was found to be the most suitable container in quick (less than 10 min) microwave reactions for Li-containing alloys. The synthesized compounds were characterized by PXRD. Mössbauer spectroscopy was used to characterize Li17Sn4 under different conditions. The hyperfine interaction parameters of 119Sn in Li17Sn4 show a typical Li-Sn alloy Sn isomer shift (1.88 mm/s). The oxidization processes of the two intermetallic lithium alloys in air were investigated. The microwave method was found to be simple, fast and efficient, with high selectivity for the preparation of these compounds. |
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| Keywords: | Intermetallic alloy Microwave radiation Solid-state reaction |
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