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Tellurium trioxide, TeO3, is the only example of a trioxide adopting atambient conditions the VF3-type structure (a distorted variant of the cubicReO3 structure). Here we present a combined experimental (Raman scattering) andtheoretical (DFT modelling) study on the influence of high pressure (exceeding100 GPa) on the phase stability of this compound. In experiment theambient-pressure VF3-type structure (R-3c symmetry) is preserved up to 110 GPa.In contrast, calculations indicate that above 66 GPa the R-3c structure shouldtransform to a YF3-type polymorph (Pnma symmetry) with the coordination numberof Te6+ increasing from 6 to 8 upon the transition. The lack of this transitionin the room-temperature experiment is most probably connected with energeticbarriers, in analogy to what is found for compressed WO3. The YF3-type phase ispredicted to be stable up to 220 GPa when it should transform to a novelstructure of R-3 symmetry and Z = 18. We analyse the influence of pressure onthe band gap of TeO3, and discuss the present findings in the context ofstructural transformations of trioxides and trifluorides adopting an extendedstructure in the solid state

High-pressure phase transition of AB3-type compounds: case of tellurium trioxide