Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 1, Pages 537-544Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.08.142
Keywords
BiFeO3; Nanoparticles; Ca and Co codoping; Structure; Magnetism
Categories
Funding
- Key Project of National High Technology Research of China [2011AA050526]
- Ministry of Education of China [IRT1148]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
- National Natural Science Foundation of China [51172110, 51372119, 61377019]
- Training Project of College Student Innovation and Entrepre- neurship [SZDG2014018]
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BiFeO3 and Ca, Co doped BiFeO3 nanoparticles have been synthesized by the sol-gel method. Rietveld refinement of X-ray diffraction data and Raman spectra reflect a structural phase transition from rhombohedral (pure BiFeO3) to two phase coexistence (rhombohedral R3c and cubic PM-4M) in case of Bi0.9Ca0.1FeO3 and Bi0.9Ca0.1Fe0.95Co0.05O3, which indicate that Ca doping can induce the obvious change of crystal structure while Co doping cannot. An apparent blue-shift can be observed in all the doped samples along with a decrease of the direct optical band gap compared with pure BiFeO3. XPS results reveal that Ca and Co doping increases the Fe3+ ions (unidoped samples show better results), which could be an evidence for decrease of oxygen vacancies and enhancement of magnetism. Ca and Co uni-doped into BiFeO3 can enhance magnetism due to different mechanisms, more interestingly, the room temperature magnetic hysteresis (M-H) curve shows the largest saturation magnetization value in Ca, Co co-doped samples. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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