Crystal structures of ZrO₂

Figure 35: The crystal structures of the cubic, tetragonal, and monoclinic modifications of ZrO₂. The different zirconium-oxygen polyhedra are outlined. The cubic fluorite type (space group, Fm-3m) high-temperature g-modification transforms on cooling by a displasive phase transition to tetragonal b-ZrO₂ (P4₂/nmc), which on further cooling transforms, again by a displacive phase transition, to monoclinic a-ZrO₂ (P2₁/c).

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