Influence of TiO ₂ Solid Solution on the Thermal Property and Ionic Conductivity Of Partially Stabilized Zirconia

TiO ₂ (0–20 mol%)‐3 mol% yttria‐stabilized zirconia (3YSZ) ceramics were prepared by a solid‐state reaction. With increasing TiO ₂ content in 3YSZ, the structure of the main phase changed from a monoclinic, tetragonal, and cubic mixture to a tetragonal single phase. Increasing TiO ₂ 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 TiO ₂ content. The specific heat of non‐TiO ₂ ‐doped 3YSZ was slightly larger than all the doped TiO ₂ –3YSZ at room temperature. When the TiO ₂ 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 TiO ₂ solid solution. The ionic conductivity of the samples decreased with increasing TiO ₂ solid solution.