Structural Properties and ELNES of Polycrystalline and Nanoporous Mg3N2
| Autor: | Viktor Rein, Claus Feldmann, Olivia Wenzel, Dagmar Gerthsen, Radian Popescu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0303 health sciences
Materials science Nanoporous Electron energy loss spectroscopy Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Crystal 03 medical and health sciences chemistry.chemical_compound Crystallinity chemistry Transmission electron microscopy Magnesium nitride Crystallite 0210 nano-technology Spectroscopy Instrumentation 030304 developmental biology |
| Zdroj: | Microscopy and Microanalysis. 26:102-111 |
| ISSN: | 1435-8115 1431-9276 |
| Popis: | Nanoporous, high-purity magnesium nitride (Mg3N2) was synthesized with a liquid ammonia-based process, for potential applications in optoelectronics, gas separation and catalysis, since these applications require high material purity and crystallinity, which has seldom been demonstrated in the past. One way to evaluate the degree of crystalline near-range order and atomic environment is electron energy-loss spectroscopy (EELS) in a transmission electron microscope. However, there are hardly any data on Mg3N2, which makes identification of electron energy-loss near-edge structure (ELNES) features difficult. Therefore, we have studied nanoporous Mg3N2with EELS in detail in comparison to EELS spectra of bulk Mg3N2, which was analyzed as a reference material. The N-K and Mg-K edges of both materials are similar. Despite having the same crystal structure, however, there are differences in fine-structural features, such as shifts and absences of peaks in the N-K and Mg-K edges of nanoporous Mg3N2. These differences in ELNES are attributed to coordination changes in nanoporous Mg3N2caused by the significantly smaller crystallite size of 2–6 nm compared to the larger (25–125 nm) crystal size in a bulk material. |
| Databáze: | OpenAIRE |
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