Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 504, Issue 1, Pages 27-31Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.05.107
Keywords
BiFeO3; Spectroscopy; Sol-gel
Categories
Funding
- National Science Council [NSC-96-2628-E-006-010-MY3]
- National Cheng Kung University (NCKU), Taiwan
- Top University Project Office of the NCKU
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Ni-doped BiFeO3 (BFO) films have been prepared using sol-gel method. Photoluminescence and optical absorption measurements were carried out for the grown films and observed four emissions at 451 nm, 468 nm, 513 nm and 689 nm. The band gap of the Ni-doped BFO was calculated from the absorption data to be 2.75 eV. The spectroscopic data were analyzed in conjunction with the results of conductivity vs. temperature measurements, which showed three different kinds of activation energies related to the defect and dopant levels inside the band gap. The observed emissions were attributed to the transitions from the oxygen vacancy, Bi2+ and Ni3+ levels, as well as the intrinsic band-to-band transition. (C) 2010 Elsevier B.V. All rights reserved.
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