Near-Ir Raman Spectroscopy of Graphitic B–C–N Materials
| Autor: | Shiv K. Sharma, A. S. Anokhin, Shrikant Bhat, Anupam K. Misra, I. B. Kutuza, Ralf Riedel, D. Yu. Velikovskii, Pavel V. Zinin, Vladimir P. Filonenko |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Analytical chemistry Laser 01 natural sciences Spectral line law.invention 010309 optics symbols.namesake Crystallinity Mechanics of Materials law 0103 physical sciences Dispersion (optics) Materials Chemistry Ceramics and Composites symbols Graphite Raman spectroscopy Raman scattering Excitation |
| Zdroj: | Glass and Ceramics. 76:439-445 |
| ISSN: | 1573-8515 0361-7610 |
| DOI: | 10.1007/s10717-020-00219-2 |
| Popis: | Raman scattering (RS) by graphitic phases BCxN (g-BCxN), obtained by different methods, was studied using an excitation laser operating in the near-IR (NIR) range. With such excitation the most characteristic peaks for g-BCxN are 1300 cm–1 (D-peak) and 1505 cm–1 (G-peak). It is shown that the D- and G-peaks are associated with disordered graphite: the D-peak is observed because the selection rules change, and its intensity is correlated with the size of the graphite cluster sp2 in a polycrystalline graphite; the G-band is associated with thegraphite mode that is RS-active in the E2g plane. The shift of the D-peak in g-BCxN (1300 cm–1 ) as compared with its position in graphite (1355 cm–1 ) can be explained by the positional dispersion of the D-peak with excitation wavelength. The RS line centered at 1260 cm–1, which could be associated with a RS-active mode, is observed only for samples with high crystallinity and for RS spectra obtained at high pressures and high temperatures. |
| Databáze: | OpenAIRE |
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