High temperature synthesis of Si-based nanomaterials from silica rich oxide

S. V. Komarov, D. V. Kuznetsov, V. V. Levina, M. Hirasawa

Research output: Contribution to journalArticlepeer-review

Abstract

Silicon based nanoparticulates were produced by smelting reduction method including a high temperature carbothermic reduction of silica-rich SiO 2-Al2O3-CaO melt to SiO and transfer of the SiO vapor with an Ar carrier-gas to cooler parts of experimental reactor where the vapor was condensed and deposited as nanostructures of different morphology. The obtained nanostructures were characterized with XRD, SEM, TEM and EDX/WDX. The amorphous SiOx nanoparticles of 30-50 ran in diameter were deposited at locations of lower temperatures, T < 920 K. The SiC nanowires were grown under high temperature conditions, T > 1320 K. The nanowires had diameter ranging from 20 to 60 nm and length up to several micrometers. The high temperature deposit included particles of crystalline Si with diameter ranged from 20 to few hundred nanometers. At the intermediate temperature range, nanoparticles formed chains and agglomerates containing all the above phases.

Original languageEnglish
Pages (from-to)73-76
Number of pages4
JournalJournal of Metastable and Nanocrystalline Materials
Volume24-25
DOIs
Publication statusPublished - 2005

Keywords

  • Morphology
  • Nanoparticulate
  • Phase composition
  • Process yield
  • Silica-rich melt
  • Silicon
  • Silicon carbide
  • Silicon monoxide
  • Smelting reduction process

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Materials Science(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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