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 5min for Li 21Si5 or 10min for Li17Sn4. A cheap alumina crucible was found to be the most suitable container in quick (less than 10min) 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 (1.88mm/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.
Bibliographical noteFunding Information:
Dr. G.-T. Zhou thanks the Fred and Barbara Kort Postdoctoral Fellowship Foundation for financial support and the China Scholarship Council for its support. Prof. A. Gedanken thanks the EC for a research grant ENK6-CT-1999-00006, awarded through the 5th Program to a consortium entitled NanoBatt.
- Intermetallic alloy
- Microwave radiation
- Solid-state reaction