Synthesis and characterization of nanometric strontium-doped ceria solid solutions via glycine-nitrate procedure

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Abstract

Nanometric-sized strontium doped ceria powders were prepared by combustion glycine-nitrate procedure. Cerium nitrate and strontium nitrate were used as starting material whereas glycine is used as a fuel. The tailored composition was: Ce1−xSrxO2−δ with concentration “x” ranging from 0 to 0.15. The effect of dopant concentration and subsequent calcination on crystal stability and lattice parameter was studied. Results showed that the obtained powders were solid solutions with a fluorite-type crystal structure. The particle size was in the nanometric range (<15 nm). Calcination of as-prepared powders at 850°C caused the formation of secondary phase (SrCeO3) in samples containing with fraction of Sr2+ ions ≥9 mol %. The solubility limit of Sr2+ ions in ceria lattice was between 6 and 9 mol % at 850°C. The solid solution of 6 mol % Sr2+ was stable even at temperature as high as 1550°C.

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