希土類固溶セリアの熱膨張

概要

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The thermal expansion of CeO_2 and rare-earth-doped ceria (Ce_<0.8>R_<0.2>O_<1.9>, R: Yb, Y, Gd, Sm, Nd and La) was measured in the temperature range from 298 to 1473 K. The coefficients of thermal expansion (CTE) were determined by differentiating the thermal expansion expressed by a polynominal equation of temperature with respect to temperature. The CTE (α_1) for Ce_<0.8>R_<0.2>O_<1.9> was in the range from 10 × 10^<-6> to 14 × 10^<-6> K^<-1> and increased nonlinearly with increasing temperature. This result was explained by the asymmetric curve of potential energy based on the lattice energy theory. The kinds of dopant gave small effect on the α_1 of rare-earth-doped ceria. On the other hand, the average CTE for CeO_2 and rare-earth-doped ceria (12.0-12.5 × 10^<-6> K^<-1>), determined from a linear approximation of thermal expansion with respect to temperature at 298-1273 K, was lower than the α_1 and close to the previously reported values.
社団法人日本セラミックス協会の論文
2002-07-01