Transformation of rutile to TiO2-II in a high pressure hydrothermal environment

Kristina Spektor, Dung Trung Tran, Kurt Leinenweber, Ulrich Häussermann

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The high pressure transformation of rutile to TiO2-II with the α-PbO2 structure is known to be kinetically hindered. In this study we show that a hydrothermal environment at 6 GPa and 650 C provides appreciable rates for producing single phase bulk samples of TiO2-II. So obtained TiO2-II was characterized by scanning electron microscopy, powder X-ray diffraction, Raman and Far-IR spectroscopy. The structural properties are identical to TiO2-II from dry transitions. Transmission electron microscopy studies strongly indicate that Ostwald ripening processes play an important role in the hydrothermally assisted transformation and subsequent growth of TiO2-II crystals. TiO2-II is thermally stable to about 550 C. At 600 C the onset of the transformation to rutile is observed. The thermal expansion in the temperature range from room temperature to 500 C is highly anisotropic, virtually affecting only the c unit cell parameter (αc=7.1(2)×10-6 C -1). The pressure-temperature conditions for the hydrothermally assisted transformation of rutile are viable for industrial production settings, and in light of the large technological significance of TiO2, TiO2-II may present an interesting target for large-scale synthesis.

Original languageEnglish (US)
Pages (from-to)209-216
Number of pages8
JournalJournal of Solid State Chemistry
Volume206
DOIs
StatePublished - Sep 13 2013

Fingerprint

rutile
Ostwald ripening
X ray powder diffraction
Temperature
Thermal expansion
Structural properties
Infrared spectroscopy
Transmission electron microscopy
thermal expansion
Crystals
Scanning electron microscopy
transmission electron microscopy
scanning electron microscopy
temperature
titanium dioxide
room temperature
synthesis
cells
diffraction
spectroscopy

Keywords

  • High pressure polymorphism
  • Hydrothermal synthesis
  • Multi anvil techniques
  • Titania

ASJC Scopus subject areas

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

Cite this

Transformation of rutile to TiO2-II in a high pressure hydrothermal environment. / Spektor, Kristina; Tran, Dung Trung; Leinenweber, Kurt; Häussermann, Ulrich.

In: Journal of Solid State Chemistry, Vol. 206, 13.09.2013, p. 209-216.

Research output: Contribution to journalArticle

Spektor, Kristina ; Tran, Dung Trung ; Leinenweber, Kurt ; Häussermann, Ulrich. / Transformation of rutile to TiO2-II in a high pressure hydrothermal environment. In: Journal of Solid State Chemistry. 2013 ; Vol. 206. pp. 209-216.
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