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Magnetite/maghemite mixture prepared in benzyl alcohol for the preparation of α"-Fe16N2 with α-Fe
Title: | Magnetite/maghemite mixture prepared in benzyl alcohol for the preparation of α"-Fe16N2 with α-Fe |
Authors: | Masubuchi, Y. Browse this author →KAKEN DB | Yamashita, S. Browse this author | Motohashi, T. Browse this author | Kikkawa, S. Browse this author | Niederberger, M. Browse this author |
Keywords: | Iron oxide | Iron nitride | Magnetic property | Nanoparticle | Non-aqueous synthesis |
Issue Date: | Nov-2011 |
Publisher: | Elsevier |
Journal Title: | Journal of the European Ceramic Society |
Volume: | 31 |
Issue: | 14 |
Start Page: | 2471 |
End Page: | 2474 |
Publisher DOI: | 10.1016/j.jeurceramsoc.2011.02.001 |
Abstract: | Fine powder of iron oxide has been required in the preparation of ferromagnetic α"-Fe16N2 powder in low temperature nitridation. Its particle size of about 30 nm and less humidity content was crucial in the reproducible α"-Fe16N2 preparation in high yield. Magnetite and maghemite mixture with about 40 nm particle size was obtained by the reaction of iron acetylacetonate Fe(acac)3 of more than 4 g dissolved in 40 mL benzyl alcohol. It was reduced to α-Fe in hydrogen at 400 ℃. Particle size of the α-Fe was 300 nm in the reduction of iron oxides obtained from 2 g of Fe(acac)3. It decreased to 100 nm in the preparation using 8 g of Fe(acac)3 because smaller iron oxide was easily reduced sintering to larger α-Fe particle. After the successive nitridation under ammonia flow at 160℃, the highest yield of α"-Fe16N2 in 66 wt% was observed on the nitrided product from the latter α-Fe because of the smallest α-Fe particle size after the reduction in the present study. The yield and reproducibility of α"-Fe16N2 formation in low temperature nitridation was improved by using the iron oxide prepared in non-aqueous benzyl alcohol compared to the use of magnetite obtained from aqueous solution. Benzyl alcohol was a useful solvent to obtain iron oxide fine powder having less humidity because of its very small water solubility. |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/47362 |
Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 鱒渕 友治
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