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This work reports on the pressure dependence of the octahedra tilts and meanFe-O bond lengths in RFeO3 (R=Nd, Sm, Eu, Gd, Tb and Dy), determined throughsynchrotron X-ray diffraction and Raman scattering, and their role on thepressure induced phase transition displayed by all of these compounds. Forlarger rare-earth cations (Nd-Sm), both anti- and in-phase octahedra tiltingdecrease as pressure increases, whereas the reverse behavior is observed forsmaller ones (Gd-Dy). EuFeO3 stands at the borderline, as the tilts arepressure independent. For the compounds where the tilts increase with pressure,the FeO6 octahedra are compressed at lower rates than for those ones exhibitingopposite pressure tilt dependence. The crossover between the two oppositepressure behaviors is discussed and faced with the rules grounded on thecurrent theoretical approaches. The similarity of the pressure-inducedisostructural insulator-to-metal phase transition, observed in the wholeseries, point out that the tilts play a minor role in its driving mechanisms. Aclear relationship between octahedra compressibility and critical pressure isascertained.

Crossover in the pressure evolution of elementary distortions in RFeO3 perovskites and its impact on their phase transition