On nitrogen sorption during high energy milling of silicon powders in ammonia and nitrogen
| Autor: | Leon L. Shaw, Zhenguo Yang, Ruiming Ren, Xiangqun Xie |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Materials science
Silicon Metallurgy technology industry and agriculture Metals and Alloys chemistry.chemical_element Sorption Condensed Matter Physics Microstructure complex mixtures Nitrogen Ammonia chemistry.chemical_compound Crystallography chemistry Chemical engineering Mechanics of Materials Transmission electron microscopy Powder metallurgy Metal powder |
| Zdroj: | Metallurgical and Materials Transactions A. 30:1109-1117 |
| ISSN: | 1543-1940 1073-5623 |
| DOI: | 10.1007/s11661-999-0163-0 |
| Popis: | A systematic study on nitrogen sorption during high energy milling of Si powder in NH3 and N2 has been conducted. X-ray diffraction (XRD), transmission electron microscopy (TEM), and nuclear magnetic resonance (NMR) have been used to analyze the milled powder and correlate the enhanced nitrogen sorption to the structural change of Si powder during milling. It is found that the amount of the sorbed nitrogen in Si is substantially higher than that predicted by the equilibrium phase diagram. Further, the sorbed nitrogen is primarily present in the amorphous phase. NH3 is found to be much more effective than N2 in enhancing the sorption of nitrogen. Mechanisms responsible for these phenomena are discussed based on the structural change of Si powder and mechanical activation induced by high energy milling. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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