Experimental determination of activity interaction coefficients of components in Si-B-Fe and Si-B-Al ternary systems at 1723 K

  • Fan Yang Kunming University of Science and Technology
  • Yeqiang Zhou Kunming University of Science and Technology
  • Jijun Wu Kunming University of Science and Technology
  • Wenhui Ma Kunming University of Science and Technology
  • Yun Lei Kunming University of Science and Technology

Abstract


The interactions among impurity components in Si-based solution are the important thermodynamic parameters for the purification of silicon materials. A "same concentration" method was used to determine the activity interaction coefficients of Fe to B and Al to B in the silicon solution. Fe and Al were respectively dissolved into the binary Si-B solution at 1723 K with the holding time of 5 h, 7 h, 9 h and 11 h. The equilibrium concentrations of Fe, B in the Si-B-Fe system and Al, B in the Si-B-Al system were determined. The interaction coefficients of Fe to B and Al to B were obtained by fitting the solubility data of B, Fe and Al. The solubility relationships between B and [%Fe] and between B and [%Al] were obtained, respectively. It is found by the SEM and EPMA pictures of samples that the third component Fe or Al added to the binary Si-B solution have been fully alloyed, which verifies the accuracy of the experimental determination results. The significance of the activity interaction coefficient of B on boron removal from industrial silicon was analyzed.

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Published
2020/09/15
How to Cite
Yang, F., Zhou, Y., Wu, J., Ma, W., & Lei, Y. (2020). Experimental determination of activity interaction coefficients of components in Si-B-Fe and Si-B-Al ternary systems at 1723 K. Journal of Mining and Metallurgy, Section B: Metallurgy, 56(2), 153-160. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/22698
Issue
Vol. 56 No. 2 (2020)
Section
Original Scientific Paper

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