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Abstract
0.5xLn2O3-(1−x) CeO2 (Ln = Sm, Eu, Gd, x = 0–1.0) powders were prepared by reverse-coprecipitation-calcination method and characterized by XRD. The limited substitution solid solution was formed while the Ln2O3 (Ln = Sm, Eu, Gd) introduce in the fluorite type structure CeO2, the maximum solid solubility is 40%. The lattice parameters of the fluorite structure solid solutions increased with extensive adoption of Ln3+ and temperature going up. The lattice thermal expansion coefficients (25–1200 °C) of fluorite structure Eu0.1Ce0.9O1.95 and Gd0.1Ce0.9O1.95 reached to 14.96 × 10−6 °C−1 and 14.75 × 10−6 °C−1, respectively.
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