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

Silva, A. C. S.; Souza, G. G.; Nobre, M. A. L.; Pires, A. M.
August 2010
Journal of Materials Science;Aug2010, Vol. 45 Issue 15, p4216
Academic Journal
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.


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