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The thermal diffusivity of yttria–zirconia (Y 2 O 3 –ZrO 2 ) single crystals, with YO 1.5 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 YO 1.5 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.
Bisson et al. (Tue,) studied this question.
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