Formation of zinc silicate in supercritical water followed with in situ synchrotron radiation X-ray diffraction

Masafumi Takesue, Kenji Shimoyama, Kazuaki Shibuki, Atsuko Suino, Yukiya Hakuta, Hiromichi Hayashi, Yasuo Ohishi, Richard Lee Smith

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Phase formation mechanism of a highly practical inorganic phosphor, α-Zn2SiO4:Mn2+ crystal in supercritical water firstly has been investigated in situ with synchrotron radiation X-ray diffraction. Green-emitting α-Zn2SiO4:Mn2+ crystal formed at a reaction time as low as 400 s at temperatures close to the critical point of water (374 °C) and at high-pressures of around 0.7 GPa compared with typical conditions (ca. 1200 °C, 4 h) for conventional solid-state processes. The operating temperatures and pressures are close to industrial conditions for hydrothermal growth of single crystals, suggesting that supercritical water conditions can be used as a low environmental burden method for producing inorganic phosphors. In this study, it was confirmed that the hydrate mineral, hemimorphite (Zn4(OH)2Si2O7·H2O) appears with the anhydrous mineral, willemite (α-Zn2SiO4) in supercritical water.

Original languageEnglish
Pages (from-to)351-355
Number of pages5
JournalJournal of Supercritical Fluids
Volume49
Issue number3
DOIs
Publication statusPublished - 2009 Jul

Keywords

  • Crystal growth
  • Hydrothermal reaction
  • Low temperature synthesis
  • Material processing
  • Supercritical water
  • Willemite
  • Zinc silicate

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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