Abstract
The thermal conductivities of [(ZrO 2) 1- x(CeO 2) x] 0.92(Y 2O 3) 0.08 (0 ≤ x ≤ 1) solid solutions are studied in this paper. The incorporation of ZrO 2 and CeO 2 in the solid solution decreases the thermal conductivity compared with their end members (YSZ and YDC). The thermal conductivities of the solid solutions show clearly different temperature dependences in the ZrO 2-rich (0 ≤ x ≤ 0.5) region and in the CeO 2-rich region (0.5 ≤ x ≤ 1). The composition and the temperature dependence of the thermal conductivities are discussed based on established phonon scattering theories. We have concluded that the composition dependence of the thermal conductivity of this system is mainly controlled by the mass difference between Zr 4+ and Ce 4+, while the thermal conductivity-temperature relationship is dominated by the randomness of the defect distribution. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Original language | English |
---|---|
Pages (from-to) | 914-922 |
Number of pages | 8 |
Journal | Acta Materialia |
Volume | 60 |
Issue number | 3 |
DOIs | |
Publication status | Published - Feb 2012 |
Keywords
- Defect distribution
- Mass disorder
- Oxygen vacancy
- Thermal conductivity
- ZrO 2-CeO 2-Y 2O 3 solid solutions