NDLI: Removal of Boron from Silicon-Tin Solvent by Slag Treatment

Content Provider	Springer Nature Link
Author	Ma, Xiaodong Yoshikawa, Takeshi Morita, Kazuki
Copyright Year	2013
Abstract	To eliminate B effectively from Si for its use in a solar cell, a novel process involving the slag refining of molten Si with Sn addition was investigated. The partition ratio of B between CaO-SiO$_{2}$-24 mol pct CaF$_{2}$ slag and Si-Sn alloy at 1673 K (1400 °C) was determined by the chemical equilibrium technique. It was found that the partition ratio of B was remarkably increased with the increase in Sn content of alloy, which attributes to the increase in activity coefficient of B as well as the oxygen partial pressure. The partition function was accounted as much as 200 when the alloy composition was Si-82.4 mol pct Sn, which was much higher than the reported values in the range of 1 to 3. The required amounts of slag used for B removal from Si-30, 50, and 70 mol pct Sn melts were only 15.6 pct, 6.5 pct, and 1.2 pct of that used for the removal of B directly from MG-Si without Sn addition in a single slag treatment.
Starting Page	528
Ending Page	533
Page Count	6
File Format	PDF
ISSN	10735615
Journal	Metallurgical and Materials Transactions B
Volume Number	44
Issue Number	3
e-ISSN	15431916
Language	English
Publisher	Springer US
Publisher Date	2013-02-26
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Mechanics of Materials Condensed Matter Physics

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