Abstract
TiO2(0–20 mol%)‐3 mol% yttria‐stabilized zirconia (3YSZ) ceramics were prepared by a solid‐state reaction. With increasing TiO2 content in 3YSZ, the structure of the main phase changed from a monoclinic, tetragonal, and cubic mixture to a tetragonal single phase. Increasing TiO2 content in 3YSZ caused an increase in the average grain size of these ceramics. The thermal conductivity decreased from 4.1 to 2.1 at room temperature with an increase in the TiO2 content. The specific heat of non‐TiO2‐doped 3YSZ was slightly larger than all the doped TiO2–3YSZ at room temperature. When the TiO2 content was >8 mol% in 3YSZ, no abrupt expansion, shrinkage, or cracks were observed on heating and cooling these samples; thus, the thermal stability of 3YSZ was improved by TiO2 solid solution. The ionic conductivity of the samples decreased with increasing TiO2 solid solution.
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