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- Title
Effect of synthesis conditions on the preparation of BiFeO nanopowders using two different methods.
- Authors
Rashad, M.
- Abstract
Bismuth orthoferrite (BiFeO) nanoparticles have been synthesized via the co-precipitation and the oxalate precursor methods. Effects of Bi source, annealing temperature, Bi/Fe molar ratio, oxalic acid ratio and Mn ion on the crystal structure, crystallite size, microstructure and magnetic properties of the produced powders were systematically studied. The results revealed that bismuth oxychloride and iron oxide were formed using chlorides sources. A single phase of BiFeO was formed from as-made samples with Bi/Fe molar ratio 1.1 using nitrate sources and annealed at 500 and 600 °C for 2 h via the two pathways. The pure BiFeO phase appeared as spherical and pseudocubic-like structure using the co-precipitation and the oxalic acid precursor routes, respectively. A high saturation magnetization (3.94 emu/g) was achieved for powder formed from the oxalate precursor route with Bi/Fe molar ratio 1.0 annealed at 600 °C for 2 h as the result of the formation of BiFeO. Moreover, Mn ion addition affected BiFeO properties due to the formation of BiFeMnO. Hence, the saturation magnetization and the coercive force of BiFeO were improved substantially by substitution of Mn ions (BiFeMnO, X = 0.1-0.2).
- Subjects
NANOPARTICLES; BISMUTH; ORTHOFERRITES; OXALATES; ANNEALING of metals; OXYCHLORIDES
- Publication
Journal of Materials Science: Materials in Electronics, 2012, Vol 23, Issue 4, p882
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-011-0513-8