Local Electronic Structure of Calcite Investigated Using X-ray Absorption Spectroscopy at Different Span of Time
| Autor: | Sangsul Lee, Cheol-Hwee Shim, Jitendra Pal Singh, Varsha Singh, Keun Hwa Chae |
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| Rok vydání: | 2020 |
| Předmět: |
Calcite
X-ray absorption spectroscopy Materials science Annealing (metallurgy) Coordination number Biomedical Engineering Analytical chemistry Bioengineering 02 engineering and technology General Chemistry Electronic structure 021001 nanoscience & nanotechnology Condensed Matter Physics Spectral line Bond length chemistry.chemical_compound Calcium carbonate chemistry General Materials Science 0210 nano-technology |
| Zdroj: | Journal of nanoscience and nanotechnology. 20(11) |
| ISSN: | 1533-4899 |
| Popis: | For the present work, calcite nanoparticles was synthesized from calcium nitrate by annealing precursor at 300, 400, 500 and 600°C. Ca K-edge near edge X-ray absorption fine structure measurements revealed spectral features characteristics to the amorphous phase of calcium carbonate at 300 and 400°C. At 500 and 600°C, the spectra were analogues to the calcite phase of calcium carbonate. Simulation of extended X-ray absorption fine structure spectra envisaged that both coordination number and bond distance for Ca–O bonds decreased with annealing temperature. Both parameters attained values close to standard calcite when annealed at 600°C. The spectral features at Ca L-, O K- and C K-edge near edge X-ray absorption fine structure appeared at same positions for different ages, which envisaged the occurrence of almost same local electronic structure for different span of times. |
| Databáze: | OpenAIRE |
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