Investigation on the synthesis mechanism of β-FeSi2 prepared by pulsed laser deposition |
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| Authors: | Youhua Zhou Chu Nie Huyong Tian Haoshuang Gu |
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| Institution: | School of Physics and Electronic Technology, Hubei University, Wuhan 430062, Hubei, China; 2. School of Physics and Information Engineering, Jianghan University, Wuhan 430056, Hubei, China; 3. Department of Imaging and Applied Physics, Curtin University, GPO Box U 1987, Perth 6845, WA, Australia |
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| Abstract: | The FeSi2 target alloy was fabricated by conventional powder metallurgy technology, and then, β-FeSi2 thin films was successfully prepared by pulsed laser deposition (PLD). X-ray diffraction (XRD) and field emission scanning
electron microscopy (FESEM) were used to characterize the structure, composition, and their changes in the process of β-FeSi2 preparation. In addition, a laser sintering process was also employed to prepare FeSi2 alloy. The analysis of radiation heat transfers in different-sized FeSi2 melt indicates that the cooling rate of the melt depends on the size, i.e., the cooling rate of the micron sized melt is
103 times greater than that of the millimeter-sized melt. The product α-FeSi2 by laser sintering and β-FeSi2 by PLD reveals the different phase transition process in crystallization of millimeter-sized and micron-sized (or submicron-sized)
FeSi2 melt. The results of PLD preparation process shows that β-FeSi2 could be prepared through a liquid-phase sintering, followed by a rapid cooling. |
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| Keywords: | β-FeSi2 powder metallurgy technology pulsed laser deposition radiation heat transfers |
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