Preparation of gamma -iron ultrafine particles using a transversely excited atmospheric CO sub 2 laser
Ultrafine particles of gamma -Fe which are stable at room temperature have been prepared with a high yield of maximum 90% by the SF sub 6 -sensitized infrared photodecomposition of Fe(CO) sub 5 using a transversely excited atmospheric (TEA) CO sub 2 laser. The obtained gamma -Fe particles are isotro...
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| Veröffentlicht in: | Japanese Journal of Applied Physics, Letters (Japan) Letters (Japan), 1994-02, Vol.33 (2B), p.L223-L226 |
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| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | Ultrafine particles of gamma -Fe which are stable at room temperature have been prepared with a high yield of maximum 90% by the SF sub 6 -sensitized infrared photodecomposition of Fe(CO) sub 5 using a transversely excited atmospheric (TEA) CO sub 2 laser. The obtained gamma -Fe particles are isotropic in shape, having a uniform size of 6.5-8.5 nm with a mean size of 7.6 nm and fcc structure, and are paramagnetic at 1.8-295K. The paramagnetic fcc gamma -Fe particles begin to transform into ferromagnetic bcc alpha -Fe above 473K with almost complete conversion to alpha -Fe at 653-693K. |
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| ISSN: | 0021-4922 |