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Investigation on the synthesis mechanism of β-FeSi2 prepared by pulsed laser deposition

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Wuhan University Journal of Natural Sciences

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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Correspondence to Youhua Zhou.

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Foundation item: Supported by the Special Funds for Major State Basic Research Project of China (G90923013) and the Natural Science Foundation of Department of Education of Hubei Province (20091002-176)

Biography: ZHOU Youhua, male, Ph. D., Associate professor, research direction: electronic materials, semiconductor physics and devices.

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Zhou, Y., Nie, C., Tian, H. et al. Investigation on the synthesis mechanism of β-FeSi2 prepared by pulsed laser deposition. Wuhan Univ. J. Nat. Sci. 17, 61–66 (2012). https://doi.org/10.1007/s11859-012-0805-8

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  • DOI: https://doi.org/10.1007/s11859-012-0805-8

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