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Bulk FePt/Fe3Pt nanocomposite magnets prepared by spark plasma sintering

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Bulk FePt/Fe3Pt nanocomposite magnets prepared by spark plasma sintering

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Title: Bulk FePt/Fe3Pt nanocomposite magnets prepared by spark plasma sintering
Author: Nandwana, Vikas; Rong, Chuan-Bing; Poudyal, Narayan; Liu, J. Ping; Saito, Tetsuji; Wu, Yaqiao; Kramer, Matthew J.
Abstract: FePt/Fe3Pt bulk nanocomposite magnets have been prepared by the spark plasma sintering of chemically synthesized FePt and Fe3O4 nanoparticles under 100 MPa at 400–600 °C. It was found that the phase transition of the FePt compound from the face centered cubic to the L10 started at 500 °C and was almost completed at 600 °C during the sintering. The activated atomic diffusion during the phase transition led to a significant increase in density. The density about 70% of the theoretical value has been obtained. Grain size of the sintered samples remains nanoscale even after a postannealing at 700 °C. Pressure rather than temperature was more effective in enhancing intergrain exchange coupling compared to temperature.
URI: http://hdl.handle.net/10106/5081
Date: 2007
External Link: http://www.uta.edu/ra/real/editprofile.php?onlyview=1&pid=1866

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