Answer to Question #120792 in Inorganic Chemistry for Yuki

Question #120792
GeO2 exists in a number of structures, most commonly a hexagonal form that is built on corner sharing GeO4 tetrahedra and a tetragonal structure in the mineral argutite built from edge sharing GeO6 octahedra.
Giving your reasoning predict if a direct transformation between the hexagonal and tetragonal structures is likely to be first order or continuous.
Expert's answer

The two polymorphs of are hexagonal and tetragonal.

Hexagonal has the same structure quartz , with germanium having coordination number . Tetragonal (The mineral argutite) has the notile-like structure seen in stishovite. Germanium in this motif has coordination number 6.

is a chemical analogue of . It is, to some extent a structural analogue, as the low and high-pressure short-range order (tetrahedral and octahedral) is the same. However, a number of differences exist. The phase diagram, and all three phases (crystalline, glass, liquid) have an increased sensitivity to pressure, undergoing pressure induced changes at much lower pressures than their equivalent analogues.

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