Formation of Si grains from a NaSi melt prepared by reaction of SiO 2 and Na

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5 Citations (Scopus)

Abstract

A mixture of Na2SiO3 and NaSi was found to be formed by reaction of SiO2 and Na at 650 C as follows: 5Na+3SiO 2→2Na2SiO3+NaSi. Single crystals of NaSi were grown by cooling the mixture of Na2SiO3 and NaSi with an excess amount of Na from 850 C, and polycrystalline Si was obtained by vaporization of Na from the crystals. Coarse grains of Si were also crystallized by Na evaporation after the formation of Na2SiO3 and Si-dissolved liquid Na at 830 C. The Si grains were collected by washing the product with water. The yield of the Si grains was 85% of the ideal amount expected from the reaction.

Original languageEnglish
Pages (from-to)66-71
Number of pages6
JournalJournal of Crystal Growth
Volume377
DOIs
Publication statusPublished - 2013

Keywords

  • A1. Purification
  • A1. Segregation
  • A2. Growth from melt
  • B1. Quartz
  • B1. Silicon
  • B1. Sodium silicide

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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