Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 507, Issue 1, Pages 29-32Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.07.193
Keywords
BiFeO3; Nanocrystalline; Ba doping; Magnetic properties; Dielectric properties
Categories
Funding
- Shanghai Nanotechnology Promotion Center [0852 nm03200]
- ECNU [52YB2010]
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Ba doped BiFeO3 nanocrystallines were prepared by a sol-gel method. The crystal structure and morphology of the prepared samples were characterized using X-ray diffraction analysis and transmission electron microscope, respectively. The results showed that the lattice structure of the nanocrystallines transformed from rhombohedral to tetragonal with Ba substitution increased and the average grain size of the prepared samples lay in the range of 20-70 nm. Dielectric properties and magnetic properties of the nanocrystallines were studied. Dielectric properties were measured up to high frequency similar to 100 MHz. We found that suitable amount of Ba dopant was helpful to improve the dielectric properties of BFO and the nanocrystalline with 20% Ba doping on Bi sites had the best dielectric properties among the Ba doped nanocrystallines. Magnetic properties of the nanocrystallines were greatly improved due to the presence of oxygen deficiency and significant opening in the room-temperature M-H loop was observed with Ba substitution. All the nanocrystallines presented the high ratio of M-r/M from 0.462 to 0.594 and large coercivity from 3.92 to 5.16 kOe. (C) 2010 Elsevier B.V. All rights reserved.
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