Photoluminescence and Raman spectroscopy studies of Eu3+-doped rutile TiO2nanocrystals at high pressures

Autor:	Y. Q. Sheng, Z. M. Zhang, Bingfu Lei, Zhiguo Ding, Q. G. Zeng
Rok vydání:	2012
Předmět:	Photoluminescence Materials science Hydrostatic pressure Analytical chemistry Mineralogy Condensed Matter Physics symbols.namesake chemistry.chemical_compound chemistry Nanocrystal Rutile Phase (matter) Titanium dioxide symbols Raman spectroscopy Ambient pressure
Zdroj:	High Pressure Research. 32:412-418
ISSN:	1477-2299 0895-7959
DOI:	10.1080/08957959.2012.710235
Popis:	Nanocrystal samples (particle size about 90 nm) of Eu3+-doped rutile titanium dioxide (TiO2) nanocrystals (rutile Eu3+/TiO2 nanocrystals) were synthesized by the sol–gel method with hydrothermal treatment. The pressure effect on photoluminescence (PL) and Raman spectra of the rutile Eu3+/TiO2 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 5D 0→7F 2 transition of Eu3+ 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 α-PbO2-type phase was observed at ambient pressure.
Databáze:	OpenAIRE
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