Influences of Annealing Temperature and Doping Concentration on Microstructural and Optical Properties of CeO2:Sm3+ Nanocrystals

Abstract

Nanocrystals of CeO 2 with different doping concentrations of Sm 3? were synthesized by a novel and costeffective method. The crystal structure, morphology and particle size were systematically investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Effects of the annealing temperature and doping concentrations on the microstructural properties of the crystals were studied. X-ray diffraction analysis indicates that the cubic structure of the CeO 2 is not affected by the doping of Sm 3? up to a doping concentration of 20%. Different structural parameters such as lattice constant, surface area, bulk density and porosity of the crystal were determined and discussed. Microscopic images of the CeO 2 :Sm 3? suggest that the thermal decomposition of oxalate precursor is a suitable synthesis pathway to produce uniform-sized microparticles and nanoparticles. The influences of annealing temperature and doping concentration of Sm 3? on the optical properties of the nanocrystals were also discussed. The photoluminescence excitation spectra reveal that the charge transfer band is redshifted with increasing annealing temperatures. Emission attains its maximum intensity for Sm 3? concentration of 1%, and higher concentrations lead to emission quenching.

SINTESIS DAN KARAKTERISASI ELEKTROLIT Ce0,9Gd0,1-XNdXO1,90 UNTUK APLIKASI SEL BAHAN BAKAR PADATAN SUHU SEDANG

“…Distorsi simetri ini akan menyebabkan perubahan panjang ikatan Ce-O dan keseluruhan kisi, sehingga parameter kisi serium meningkat. Keadaan inilah yang dapat menyebabkan meningkatnya volume unit sel GDC-Nd [12].…”