期刊
APPLIED PHYSICS LETTERS
卷 97, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3489926
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资金
- NSFC [60906046]
- 973 Program [2007CB924901, 2011CB922200]
- MOE [NCET-08-0192]
- SMCST [10DJ1400201, 08JC1409000, 08520706100, 09ZZ42]
The ultraviolet-infrared transmittance spectra of BiFeO3 nanocrystalline film have been studied in the temperature range 5.3-300 K. A redshift trend of the absorption edge and optical constants with increasing the temperature can be observed. Four interband electronic transitions can be uniquely assigned and strongly depend on the temperature. Moreover, two magnetic transitions located at about 150 and 200 K have been observed and can be interpreted as spin-reorientation transitions. It was found that the optical band gap decreases from 2.69 +/- 0.01 to 2.65 +/- 0.01 eV with increasing the temperature due to the modification of the electron-phonon interactions. (C) 2010 American Institute of Physics. [doi:10.1063/1.3489926]
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