High pressure Raman spectroscopy of TiO/sub 2/ thin films
The pressure dependences of the Raman active modes in submicrometer films of the anatase and rutile crystalline phases of TiO/sub 2/ have been determined at pressures approaching 90 Kbar. Films investigated have been prepared by reactive sputter deposition and sol-gel techniques. Band frequency shifts as a function of applied pressure for the rutile phase are in agreement with measurements from single crystal samples. However, sol-gel films (anatase) exhibit larger frequency shifts than powder or single crystal samples, and do not undergo the expected pressure-induced phase transformation to the TiO/sub 2/-II phase. This anomalous pressure response is discussed in terms of the complex film microstructure evaluated from TEM cross-sectional measurements. 11 refs., 5 figs.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76RL01830; AM06-70RL02225
- OSTI ID:
- 6443234
- Report Number(s):
- PNL-SA-16168; CONF-890145-9; ON: DE89006937
- Country of Publication:
- United States
- Language:
- English
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360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CHALCOGENIDES
CRYSTAL STRUCTURE
CRYSTALS
FILMS
LASER SPECTROSCOPY
MICROSTRUCTURE
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SOL-GEL PROCESS
SPECTRA
SPECTROSCOPY
THIN FILMS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS