title: Effects of Eu3+ concentration on structural, optical and vibrational properties of multifunctional Ce(1-x)Eu(x)O2-delta) nanoparticles synthesized by thermolysis of 2,4-pentanedione complexes.
abstract: The 5-10 nm Ce(1-x)Eu(x)O(2-delta) (0 < or = x < or = 0.30) nanoparticles with fluorite structure were synthesized by thermal decomposition of Eu- and Ce-2,4-pentanedione complexes mixtures. X-ray line broadening analysis of mixed samples Ce(1-x)Eu(x)O(2-delta) (0.05 < or = x < or = 0.30) showed that the crystallite size was lower and root mean square strain higher than in pure ceria. However, within mixed samples Ce(1-x)Eu(x)O(2-delta) (0.05 < or = x < or = 0.30) crystallite size and root mean square strain were independent of Eu3+ concentration. Raman spectroscopy results indicated that europium ions yield disorder by breaking the phonon propagation and therefore making the non-centre Brillouin zone modes Raman active. The absorption bands in the spectra of mixed oxides were blue-shifted in comparison to pure CeO(2-delta) nanopowder. The samples show red emission typical for Eu ions. The biggest photoluminescent intensity was observed for the highest Eu3+ concentration (x = 0.30) and further enhanced with the increase in crystallinity.
authors: "Vinca" Institute of Nuclear Sciences, University of Belgrade, PO Box 522, 11001 Belgrade, Serbia.
authors: A
authors: A
authors: Kremenovic
authors: D K
authors: DK
authors: Bozanic
authors: A M
authors: AM
authors: Welsch
authors: B
authors: B
authors: Jancar
authors: A S
authors: AS
authors: Nikolic
authors: M
authors: M
authors: Boskovic
authors: Ph
authors: P
authors: Colomban
authors: Martin
authors: M
authors: Fabian
authors: B
authors: B
authors: Antic