期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 25, 期 10, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/25/10/102201
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We report an experimental study of the phonon dispersion in BiFeO3 single crystals at ambient conditions by inelastic x-ray scattering (IXS). The phonon dispersions were recorded along several symmetry directions up to 35 meV. Our results compare favorably with first-principles calculations performed using density functional theory (DFT) within the local-density approximation (LDA). We resolve a discrepancy concerning the symmetry of the optical phonon branches observed by Raman spectroscopy, determine the energy of the lowest Raman and infrared silent mode, and derive a subset of the elastic moduli of BiFeO3.
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