Thermoluminescence response induced by UV radiation in Eu-doped zirconia nanopowders
Por:
Villa-Sanchez, G, Mendoza-Anaya, D, Mondragon-Galicia, G, Perez-Hernandez, R, Olea-Mejia, O, Gonzalez-Martinez, PR
Publicada:
1 abr 2014
Categoría:
Radiation
Resumen:
Eu-doped zirconia nanopowders were prepared by the sol-gel method. A
detailed examination of the morphology and crystalline characterisation
was performed through scanning and transmission electron microscopy and
X-ray diffraction. Analysis of the thermoluminescent (TL) properties of
the ZrO2 doped with Eu and exposed to UV radiation was also conducted.
The characterisation results show an appreciable influence of the
Eu-dopant on particle sizes and the zirconia crystalline phases; at
lower concentration of Eu, tetragonal ZrO2 is the most abundant phase
whereas a concentration up to 2.0 wt% of Eu leads to the formation of
the monoclinic phase. However, if the proportion of Eu increases to 4.0
wt %, the presence of monoclinic ZrO2 diminishes. Monoclinic ZrO2 is
responsible for trapping and recombination mechanisms. Nevertheless,
depending on the concentration of Eu(III), different glow curves are
induced by UV radiation on ZrO2:Eu. A better thermoluminescence response
was observed for ZrO2:Eu (1.0 wt%) sample, in which only one narrow
glow peak centred at 130 degrees C with almost two times intensity of
pure ZrO2 was observed. (C) 2013 Elsevier Ltd. All rights reserved.
Filiaciones:
Olea-Mejia, O:
UAEM, Fac Quim, Ctr Conjunto Invest Quim Sustentable UAEM UNAM, San Cayetano 50200, Mexico
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