Transformation of Yttria‐Doped Tetragonal ZrO 2 Poly crystals by Annealing under Controlled Humidity Conditions

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Phase changes on the surface resulting from low‐temperature annealing of yttria‐doped tetragonal ZrO 2 polycrystals under controlled humidity conditions were investigated at 0.1 to 7350 Pa of water vapor pressure and 100° to 600°C for 1 to 50 h. The tetragonal‐to‐monoclinic phase transformation was greatly accelerated by increasing water vapor pressure; the transformation rate was first order with respect to the concentration of tetragonal ZrO 2 on the surface of the sample.