Synthesis and characterization of Co2+: MgAl2O4 nanocrystal
| Autor: | Xiulan Duan, Haiqing Sun, Zhanfa Li, Zhihong Sun, Xuzhong Shi, Caina Luan, Duorong Yuan, Guanghui Zhang, Dongying Pan, Shiyi Guo |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Aqueous solution Absorption spectroscopy Spinel Inorganic chemistry Analytical chemistry General Chemistry engineering.material Condensed Matter Physics Nanocrystalline material Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound chemistry Nanocrystal Ternary compound Absorption band Materials Chemistry Ceramics and Composites engineering Sol-gel |
| Zdroj: | Journal of Sol-Gel Science and Technology. 38:245-249 |
| ISSN: | 1573-4846 0928-0707 |
| DOI: | 10.1007/s10971-006-7996-4 |
| Popis: | Nanocrystalline Co2+-doped magnesium aluminate spinel (MgAl2O4) has been synthesized for the first time from aqueous solution of metal nitrates containing citric acid as chelating agent by a sol-gel method. The gel was heat-treated at temperatures ranging from 710°C to 1000°C. The heated powder samples were characterized by X-ray diffraction analysis (XRD), transmission electron microscope (TEM), infrared (IR) and absorption spectroscopy. The results showed that the homogeneous nanocrystalline Co2+: MgAl2O4 could be obtained at the low temperature of 710°C. The optimal temperature is about 900°C and the average size of the powder grains is 50 nm or so. In the absorption spectrum, a broad absorption band from 1200 nm to 1600 nm was found, which indicated the existence of Co2+ in the tetrahedral sites because of the 4A2(4F) → 4T(4F) transition of Co2+. |
| Databáze: | OpenAIRE |
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