The crystallization of anatase and the conversion to bronze-type TiO2 under hydrothermal conditions

H. Nishizawa, Y. Aoki

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

When the anatase form of TiO2 was heated at a constant rate of 6°C/min to 450°C it crystallized from hydrated amorphous TiO2 gel at 170°C in pure water or at <150°C in NaOH solutions. The uptake of Na+ ions into crystallized anatase affected the reactions subsequent to this initial crystallization while only anatase crystals continued to grow with increasing temperature in pure water. Immediately after the nearly amorphous second stage at 325°C, conversion from colloidal anatase particles to square sheet-shaped bronze-type TiO2 crystals began at 350°C and was complete at 425°C in 0.5 M NaOH. This conversion was considered to proceed via crystallographic shear rather than via dissolution and precipitation since this also happened with thermal treatment to 700°C in air.

Original languageEnglish
Pages (from-to)158-165
Number of pages8
JournalJournal of Solid State Chemistry
Volume56
Issue number2
DOIs
Publication statusPublished - Feb 1985
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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