Journal
PHYSICAL REVIEW B
Volume 79, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.184110
Keywords
bismuth compounds; crystallisation; high-pressure solid-state phase transformations; infrared spectra; multiferroics; space groups
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We report experimental evidence for pressure instabilities in the model multiferroic BiFeO3 and, namely, reveal two structural phase transitions around 3.5 and 10 GPa by using diffraction and far-infrared spectroscopy at a synchrotron source. The intermediate phase crystallizes in a monoclinic space group, with octahedra tilts and small cation displacements. When the pressure is increased further the cation displacements (and thus the polar character) of BiFeO3 is suppressed above 10 GPa. The nonpolar orthorhombic Pnma structure observed above 10 GPa is in agreement with recent theoretical ab initio prediction, while the intermediate monoclinic phase has not been predicted theoretically.
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