Zr2O3

Zr2O3 is a metastable zirconium oxide ceramic belonging to the rare earth oxide family, distinct from the more common monoclinic (m-ZrO2) and tetragonal (t-ZrO2) polymorphs. This material exists primarily in research and specialized applications where its unique crystal structure and intermediate properties between zirconia phases offer advantages in high-temperature stability, thermal barrier systems, and materials requiring resistance to phase transformation. Zr2O3 is notable for its potential in extreme-environment applications where conventional zirconia undergoes unwanted phase transitions; it represents an active area of materials research rather than a commodity ceramic.