Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 25, Issue 36, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/25/36/365401
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Funding
- National Natural Science Foundation of China [11104081, 10874046]
- Cultivation Fund of the Key Scientific and Technical Innovation Project, Ministry of Education of China [708070]
- US DOE early career research award [DE-SC0006433]
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The structural and vibrational properties of 5% Y-substituted BiFeO3 under pressure have been investigated using synchrotron x-ray diffraction (SXRD) and Raman scattering measurements. At a pressure below 30.3 GPa, distinct changes in the Raman spectra and SRXD pattern show evidence for one pressure-induced structural transition from the polar rhombohedral R3c phase to the nonpolar orthorhombic Pnma phase commencing at 3.6 and completed at 7.2 GPa, where there is a region of phase coexistence between the R3c and Pnma phases. At a higher pressure of 40.8 GPa, another phase transition from orthorhombic to cubic is observed accompanied by the insulator-metal transition. Our data do not suggest the pressure-induced re-entrance of ferroelectricity in the model multiferroic Bi0.95Fe0.05O3 in the pressure range studied.
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