Rutile TiO2 has a clear ferroelastic path to the CaCl2-type (Pnnm) phase at ~13.5 GPa, but that phase is thermodynamically suppressed by more stable higher-coordination polymorphs.
Młynarczyk AND Tomasz Gośliński AND Beata Stanisz , title =
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Ferroelastic instability in rutile TiO2 and thermodynamic suppression of the CaCl2-type phase
Rutile TiO2 has a clear ferroelastic path to the CaCl2-type (Pnnm) phase at ~13.5 GPa, but that phase is thermodynamically suppressed by more stable higher-coordination polymorphs.