Thermal Conductivity of Yttria-Zirconia Single Crystals, Determined with Spatially Resolved Infrared Thermography

• Published in: Journal of the American Ceramic Society Vol. 83; no. 8; pp. 1993 - 1998
• Main Authors: Bisson, Jean-François, Fournier, Danièle, Poulain, Martine, Lavigne, Odile, Mévrel, Rémy
• Format: Journal Article
• Language: English
• Published: Westerville, Ohio American Ceramics Society 01.08.2000; Wiley Subscription Services, Inc
• Subjects: single crystals; thermal conductivity; zirconia: yttria stabilized
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1151-2916.2000.tb01502.x

The thermal diffusivity of yttria–zirconia (Y2O3–ZrO2) single crystals, with YO1.5 concentrations in the range of 0–60 mol%, has been determined using a new method that is based on spatially resolved (20 μm) infrared mapping of a modulated thermal field. The decreasing trend of the thermal conductivity (K), as a function of the YO1.5 content (up to 20 mol%), can be described using a model based on a Debye approach that has been modified by introducing a cut‐off length for the phonon mean free path. At higher concentrations, K increases, as a result of a possible ordering of the point defects.