Abstract
This paper presents a study of the synthesis and structural properties of the pyrochlore-type titanates (Gd1−xEux)2Ti2O7. Six compositions with 0≤x≤1 were prepared by solid-state reaction with thermal treatments at 1000 and 1200°C under atmospheric pressure conditions. All the products were systematically characterized by X-ray powder diffraction (XRD), Raman spectroscopy, photoluminescence (PL) and photoluminescent excitation spectra (PLE). Structural refinements of X-ray powder diffraction data using Rietveld method show that all compounds of the (Gd1−xEux)2Ti2O7 solid solution crystallize in a pyrochlore structure. The lattice parameters increase linearly with increasing Eu content in agreement with Vegard's rule. PL spectra show that the characteristic peaks correspond to the f–f transition 5D0–7FJ (J=1, 2, 3 and 4) of Eu3+. The effect of Eu3+ ions concentration on the optical properties, namely, photoluminescence emission, is measured and discussed. The oxides exhibit higher PL intensity with the Eu3+ ion concentration and strong orange emission at 589nm (5D0–7F1) corresponding to the magnetic dipole transition.
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