Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 9, Issue 6, Pages 12595-12603Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2020.08.078
Keywords
Bulk Si; Si-Fe alloy; Temperature gradient; Characterization
Funding
- National Science Foundation China [51604023]
- Fundamental Research Funds for the Central Universities [FRF-TP-18-029A1]
- USTB-NTUT Joint Research Program
- High Steel Center (HSC) at Yanshan University
- Beijing International Center of Advanced and Intelligent Manufacturing of High Quality Steel Materials (ICSM)
- High Quality Steel Consortium (HQSC) at University of Science and Technology Beijing (USTB), China
- Beijing Key Laboratory of Green Recycling and Extraction of Metals (GREM)
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Silicon growth from Si-Fe melts was investigated in view of producing high-quality Si using induced temperature gradients. Scanning electron microscopy coupled with energy-dispersive spectroscopy and micro-computed tomography analyses were used to characterize the quality of bulk Si, in particular its microstructure and purity. The migration of Si and Fe atoms along a temperature gradient in the mushy zone of the Si-Fe alloy was evidenced, which became the source of Si precipitation on the C substrate, and ultimately forming bulk Si. Furthermore, the content of residual Fe-Si can be decreased in the bulk Si by controlling the temperature gradient, the holding time, and the alloy composition. (C) 2020 The Author(s). Published by Elsevier B.V.
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