Rosenburg, Felix ; Ionescu, Emanuel ; Nicoloso, Norbert ; Riedel, Ralf (2023)
High-Temperature Raman Spectroscopy of Nano-Crystalline Carbon in Silicon Oxycarbide.
In: Materials, 2018, 11 (1)
doi: 10.26083/tuprints-00016368
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
The microstructure of segregated carbon in silicon oxycarbide (SiOC), hot-pressed at T = 1600 °C and p = 50 MPa, has been investigated by VIS Raman spectroscopy (λ = 514 nm) within the temperature range 25–1000 °C in air. The occurrence of the G, D’ and D bands at 1590, 1620 and 1350 cm⁻¹, together with a lateral crystal size La < 10 nm and an average distance between lattice defects LD ≈ 8 nm, provides evidence that carbon exists as nano-crystalline phase in SiOC containing 11 and 17 vol % carbon. Both samples show a linear red shift of the G band up to the highest temperature applied, which is in agreement with the description of the anharmonic contribution to the lattice potential by the modified Tersoff potential. The temperature coefficient χG = −0.024 ± 0.001 cm⁻¹/°C is close to that of disordered carbon, e.g., carbon nanowalls or commercial activated graphite. The line width of the G band is independent of temperature with FWHM-values of 35 cm⁻¹ (C-11) and 45 cm⁻¹ (C-17), suggesting that scattering with defects and impurities outweighs the phonon-phonon and phonon-electron interactions. Analysis of the Raman line intensities indicates vacancies as dominating defects.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Rosenburg, Felix ; Ionescu, Emanuel ; Nicoloso, Norbert ; Riedel, Ralf |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | High-Temperature Raman Spectroscopy of Nano-Crystalline Carbon in Silicon Oxycarbide |
| Sprache: | Englisch |
| Publikationsjahr: | 21 November 2023 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2018 |
| Ort der Erstveröffentlichung: | Basel |
| Verlag: | MDPI |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Materials |
| Jahrgang/Volume einer Zeitschrift: | 11 |
| (Heft-)Nummer: | 1 |
| Kollation: | 9 Seiten |
| DOI: | 10.26083/tuprints-00016368 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/16368 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | The microstructure of segregated carbon in silicon oxycarbide (SiOC), hot-pressed at T = 1600 °C and p = 50 MPa, has been investigated by VIS Raman spectroscopy (λ = 514 nm) within the temperature range 25–1000 °C in air. The occurrence of the G, D’ and D bands at 1590, 1620 and 1350 cm⁻¹, together with a lateral crystal size La < 10 nm and an average distance between lattice defects LD ≈ 8 nm, provides evidence that carbon exists as nano-crystalline phase in SiOC containing 11 and 17 vol % carbon. Both samples show a linear red shift of the G band up to the highest temperature applied, which is in agreement with the description of the anharmonic contribution to the lattice potential by the modified Tersoff potential. The temperature coefficient χG = −0.024 ± 0.001 cm⁻¹/°C is close to that of disordered carbon, e.g., carbon nanowalls or commercial activated graphite. The line width of the G band is independent of temperature with FWHM-values of 35 cm⁻¹ (C-11) and 45 cm⁻¹ (C-17), suggesting that scattering with defects and impurities outweighs the phonon-phonon and phonon-electron interactions. Analysis of the Raman line intensities indicates vacancies as dominating defects. |
| Freie Schlagworte: | polymer-derived ceramics, Raman spectroscopy, anharmonicity, carbon, defects |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-163683 |
| Zusätzliche Informationen: | This article belongs to the Special Issue Polymer Derived Ceramics and Applications |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 540 Chemie 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 21 Nov 2023 13:45 |
| Letzte Änderung: | 22 Nov 2023 10:03 |
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| Suche nach Titel in: | TUfind oder in Google |
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- High-Temperature Raman Spectroscopy of Nano-Crystalline Carbon in Silicon Oxycarbide. (deposited 21 Nov 2023 13:45) [Gegenwärtig angezeigt]
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