Structural instabilities in ABO3 perovskite under pressure

Orateur : Pierre BOUVIER (LMGP/CNRS/Grenoble INP)

I will present an overview of high pressure studies of ABO3 perovskites carried out over the past few years using Raman spectoscopy and single crystal diffraction. Examples will be taken from model perovskites in the 0-60 GPa range including pure ferroelastic perovskites distorted only by tilts of oxygen octahedra (CaTiO3, SrTiO3, KMnF3, LaAlO3), classical ferroelectrics (PbTiO3), bismuth-based multiferroic perovskites (BiFeO3, BiMnO3) and rare-earth manganites (RMnO3) which exhibit a very rich phase diagram as a result of competing interactions.

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