Crystallization behavior of iron-based amorphous nanoparticles prepared sonochemically
| Autor: | Katsuro Hayashi, Shingo Hirata, Miki Inada, Naoya Enomoto |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Acoustics and Ultrasonics Nanoparticle chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Oxygen law.invention Inorganic Chemistry law Chemical Engineering (miscellaneous) Environmental Chemistry Radiology Nuclear Medicine and imaging Crystallization Inert gas Quenching Amorphous metal Organic Chemistry Metallurgy 021001 nanoscience & nanotechnology 0104 chemical sciences Amorphous solid Chemical engineering chemistry 0210 nano-technology Reactive material |
| Zdroj: | Ultrasonics Sonochemistry. 35:563-568 |
| ISSN: | 1350-4177 |
| Popis: | In general, a rapid quenching is required to obtain an amorphous metal. It is known that an intensive ultrasonication generates a very high temperature within cavitation bubbles in a very short moment, which enables a rapid quenching process in a liquid phase synthesis. In this study, the sonochemically-derived "amorphous iron" from Fe(CO)5 was carefully examined by XRD, TEM, TG-DTA. The product was found to be an amorphous containing a certain amount (∼15%) of volatile component that can be removed by heating in a nitrogen flow. After annealed in the inert atmosphere at 600°C, cooled down to room temperature, and then exposed in air (oxygen), the sample showed a strong exotherm accompanied by a weight gain. This is due to oxidation of fine metallic iron. Experimental operations of such a reactive material were examined. |
| Databáze: | OpenAIRE |
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