Yttria stabilized zirconia, YSZ is a kind of ceramic material. By adding Yttrium(III) oxide, the phase transformation temperature range of Zirconium dioxide can be changed to produce stable cubic crystals and tetragonal crystals at room temperature.
Pure zirconia is a monoclinic phase at room temperature. When the temperature rises to about 1173 ℃, it will transform into a tetragonal phase, and when it rises to 2370 ℃, it will transform into a cubic phase. At 2690 ℃, it will become a liquid phase.