Changes in microstructure of metallurgicalgrade silicon during heating for fractional melting

C. B. Lee, J. H. Chung, J. W. Lee, H. E. Song, B. Y. Jang, J. S. Kim, Wooyoung Yoon

Research output: Contribution to journalArticle

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Abstract

Fractional melting is a good method of refining metallurgical-grade silicon. It can be used to replace the traditional Siemens process for that purpose. It is important to observe the changes in the microstructure of silicon during heating to increase the efficiency of fractional melting. The microstructures and the chemical compositions of impurity phases in heated samples were observed by using scanning electron microscopy and wavelength dispersive spectroscopy. The affinities among the various impurities were investigated using the Miedema model. Ti and Al had strong affinities with V and Ca, respectively. It is possible to use elements that have strong affinities with B and P to effectively remove B and P from the silicon matrix, which are otherwise difficult to remove because of their high segregation coefficients.

Original languageEnglish
Pages (from-to)S1290-S1296
JournalMaterials Research Innovations
Volume19
DOIs
Publication statusPublished - 2015 Apr 1

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Keywords

  • Fractionalmelting
  • Microstructure
  • Phaseidentification
  • Purification
  • Silicide

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

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