ZrO2 Three Solid Phases and Pressure-Temperature Phase Diagram for ZrO2

Question

ZrO₂ has three solid phases, monoclinic ( ), tetragonal (  and cubic ( ), a liquid phase and a vapor phase. All three solid phases can be sublimed but only the cubic phase can be melted. The normal melting and boiling temperatures are approximately 2500 and 3500⁰C. The transformations monoclinic  tetragonal  cubic  liquid are all endothermic.

The densities of the phases are related by _tetragonal > _monoclinic > _cubic > _liquid

Construct a possible pressure-temperature phase diagram for ZrO₂, justifying the slopes and positions of any phase boundaries and positions of any triple points.

Summary

This question belongs to chemistry and discusses about ZrO₂ three solid phases and to construct a possible pressure-temperature phase diagram for ZrO₂.

Total word count: Image