Abstract
Spherical shaped nanoparticles of seriesY2 − xEuxO3 (x = 0.06, 0.10, 0.20, and 2)and Gd2 − xEuxO3 (x = 0.06, 0.10)were prepared by thermolysis of 2,4-pentanedione complexes of Y, Gd, and Eu. The bixbyite phase ofGd2 − xEuxO3 samples wasformed at 500 °C, whereas the thermal decomposition of Y and Eu complexes’ mixtures occurredat higher temperatures. Linearity in the concentration dependence on latticeparameter confirmed the formation of solid solutions. The distribution ofEu3 + inGd2 − xEuxO3 was changed with thermal annealing: in the as-prepared sample (x = 0.10) the distribution waspreferential at C3i sites whilein the annealed samples, Eu3 + were distributed at both C2 and C3i sites. Rietveld refinement of site occupancies as well as emission spectra showed a random distribution ofcations in Y2 − xEuxO3. The photoluminescence (PL) measurements of the sample showed red emission with the main peak at614 nm (5D0–7F2). The PL intensity increased with increasing concentration ofEu3 + in both series. Infrared excitation was required to obtain good Raman spectra. The lineardependence of the main Raman peak wavenumber offers a non-destructive methodfor monitoring the substitution level and its homogeneity at the micron scale.
Published Version
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