Photoluminescence and Raman spectroscopy studies of Eu^sup 3+^-doped rutile TiO^sub 2^ nanocrystals at high pressures

Nanocrystal samples (particle size about 90 nm) of Eu...-doped rutile titanium dioxide (TiO2) nanocrystals (rutile Eu.../TiO... nanocrystals) were synthesized by the sol-gel method with hydrothermal treatment. The pressure effect on photoluminescence (PL) and Raman spectra of the rutile Eu.../TiO......

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Bibliographic Details
Published inHigh pressure research Vol. 32; no. 3; p. 412
Main Authors Zeng, Q G, Ding, Z J, Lei, B F, Sheng, Y Q, Zhang, Z M
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis Ltd 01.09.2012
Subjects
Fluid dynamics
Luminescence
Nanocrystals
Phase transitions
Pressure
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Summary:Nanocrystal samples (particle size about 90 nm) of Eu...-doped rutile titanium dioxide (TiO2) nanocrystals (rutile Eu.../TiO... nanocrystals) were synthesized by the sol-gel method with hydrothermal treatment. The pressure effect on photoluminescence (PL) and Raman spectra of the rutile Eu.../TiO... nanocrystals was investigated with a diamond anvil cell under hydrostatic pressure condition. Raman spectra of the samples at high pressures indicated that the critical pressure for the transition from the rutile phase to a new baddeleyite-type phase was between 10 and 14.2 GPa. The position of Raman bands shifted to high wavenumbers and the PL intensity of ... transition of Eu... decreased down to zero with the increase of pressure before the phase transition occurred. After releasing the pressure, the rutile phase was not recovered and a ...-PbO...-type phase was observed at ambient pressure. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0895-7959
1477-2299