著者

鮫島 宗一郎 河南 学 平田 好洋

出版者

The Ceramic Society of Japan

雑誌

Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌) (ISSN:09145400)

巻号頁・発行日

vol.110, no.1283, pp.597-600, 2002-07-01 (Released:2010-08-06)

参考文献数

20

被引用文献数

38 51

---

The thermal expansion of CeO2 and rare-earth-doped ceria (Ce0.8R0.2O1.9, 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 (α1) for Ce0.8R0.2O1.9 was in the range from 10×10-6 to 14×10-6K-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 α1 of rare-earth-doped ceria. On the other hand, the average CTE for CeO2 and rare-earth-doped ceria (12.0-12.5×10-6K-1), determined from a linear approximation of thermal expansion with respect to temperature at 298-1273 K, was lower than the α1 and close to the previously reported values.