Distribution of the Tetragonal-Monoclinic Phase Transition Temperature in ZrO 2 -YO 1.5 Solid Solutions

Abstract

The distribution in the tetragonal-monoclinic (t-m) phase transition temperature was investigated by the thermal expansion measurements for the are-melted ZrO2-YO1.5 specimens. The peak temperature on heating A(p) where the apparent thermal expansion coefficient has a minimum value, is higher than that on cooling M(p). The distribution of the transition temperatures increases with an increase of YO1.5 content. Therefore, the difference between the starting points of m-->t transition on heating and of t-->m transformation on cooling, A(s)-M(s) decreases with increasing YO1.5 content, and the M(s) is higher than A(s) in the 4 mol% YO1.5 sample.