Synthesis and characterization of multiferroic BiFeO3 powders fabricated by hydrothermal method
| Autor: | Ci Cheon Chae-Il Cheon, Hg Lee Hyeung-Gyu Lee, Sh Han Seung-Ho Han, Hg Kim Ho-Gi Kim, Hw Kang Hyung-Won Kang, Ks Kim Kyoung-Sun Kim, Js Kim Jeong-Seog Kim |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Scanning electron microscope Process Chemistry and Technology Nanoparticle Hydrothermal circulation Surfaces Coatings and Films Electronic Optical and Magnetic Materials Crystallography chemistry.chemical_compound Chemical engineering chemistry Phase (matter) Materials Chemistry Ceramics and Composites Particle size Dissolution Perovskite (structure) Bismuth ferrite |
| Zdroj: | Ceramics International. 36:1365-1372 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2010.01.020 |
| Popis: | The influence of processing parameters on phase formation and particle size of hydrothermally synthesized BiFeO3 powders was investigated. BiFeO3 powder was synthesized by dissolving bismuth nitrate and iron nitrate in KOH solution at temperatures ranging from 150 to 225 °C. X-ray diffraction patterns and scanning electron microscopy observation indicated that rod-like α-Bi2O3 phase was formed at initial stage of reaction and dissolved into ions to form thermodynamically stable BiFeO3 phase. Single-phase perovskite BiFeO3 has been formed using a KOH concentration of 8 M at a temperature of ≥175 °C in a 6 h reaction period. BiFeO3 particle growth was promoted by lowering the KOH concentration, or increasing the duration time or reaction temperature. The effects of processing conditions on the formation of crystalline BiFeO3 powders were discussed in terms of a dissolution–precipitation mechanism. The magnetization of the BiFeO3 powders at room temperature showed a weak a ferromagnetic nature. |
| Databáze: | OpenAIRE |
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