期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 102, 期 -, 页码 74-78出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2016.11.010
关键词
Low temperature; Nanoparticles; XANES; Exciton emissions; Eu reduction
资金
- FINEP
- CAPES
- CNPq [470.972/2013-0]
Europium-doped barium aluminate (BaAl2O4:Eu) was successfully produced using an alternative PVA (Polyvinyl Alcohol) assisted sal-gel route at low temperature. To find the best conditions of calcination, DTA/TG (Differential Thermal Analysis/Thermogravimetric Analysis) techniques were used. X-ray powder diffraction and Rietveld refinement were used to identify the crystalline phases, as well as to confirm the SaAl(2)O(4) phase formation at 600 degrees C, a much lower temperature than previously reported in the literature. The crystallite size was estimated using the Schemer's formalism showing that the prepared samples are in the nanometric scale. XANES (X-ray absorption near edge structure) measurements showed that only Eu3+ species are present in the matrix after calcinations. Optical characterization was performed by photoluminescence (PL) and radioluminescence (EL) spectra. PL studies showed exciton emissions and the characteristic Eu3+ spectrum. Samples irradiated by X-ray showed emissions associated to the exciton and Eu3+ and Eu2+ transitions. This study showed that calcination temperature greatly influenced the luminescent properties. The reproducibility of the samples was successfully tested.
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