TITLE

Synthesis and structural characterization of Eu(III)-doped Zn7Sb2O12

AUTHOR(S)
Silva, A. C. S.; Souza, G. G.; Nobre, M. A. L.; Pires, A. M.
PUB. DATE
August 2010
SOURCE
Journal of Materials Science;Aug2010, Vol. 45 Issue 15, p4216
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In addition to the lanthanide series elements, Europium is one of the chemical elements of greatest interest for the development of species with oxidation state +3 (III), which leads to interesting electronic transitions. In a general sense, their emission spectrum lines are narrow and sensitive to effects of the ligand field around metallic ions. This property allows the use of Eu(III) as a structural probe. In this work, samples of semiconductor Zn7Sb2O12 and of solid solutions based on isoelectronically Eu(III)-doped Zn7Sb2O12 with stoichiometry Zn7−3 xEu2 xSb2O12 were prepared. Both Zn7Sb2O12 and Zn7−3 xEu2 xSb2O12 were synthesized via a chemical route using Pechini’s method and characterized by Fourier transform infrared absorption vibrational spectroscopy (FTIR) and photoluminescence spectroscopy. In order to perform further spectral analyses, each spectrum was adjusted using a set of Gaussian functions. The FTIR spectrum analysis showed a slight band shift of the vibration mode assigned to the Sb–O bonding ascribed to the [SbO6] octahedron vibration. The theoretical fitting of the luminescence curves showed a broadening of the most intense emission peaks related to the transition Eu(III) 5D0 → 7F2. As a whole, the results suggest that a less symmetric Eu(III) site occupation in inverse spinel structure may occur in sites close to the antimony octahedron, involving, however, non-substitutional site occupation.
ACCESSION #
51279824

 

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