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High-Temperature Raman Spectroscopy of Nano-Crystalline Carbon in Silicon Oxycarbide

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
Article, Secondary publication, Publisher's Version

Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

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Item Type: Article
Type of entry: Secondary publication
Title: High-Temperature Raman Spectroscopy of Nano-Crystalline Carbon in Silicon Oxycarbide
Language: English
Date: 21 November 2023
Place of Publication: Darmstadt
Year of primary publication: 2018
Place of primary publication: Basel
Publisher: MDPI
Journal or Publication Title: Materials
Volume of the journal: 11
Issue Number: 1
Collation: 9 Seiten
DOI: 10.26083/tuprints-00016368
Corresponding Links:
Origin: Secondary publication DeepGreen

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.

Uncontrolled Keywords: polymer-derived ceramics, Raman spectroscopy, anharmonicity, carbon, defects
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-163683
Additional Information:

This article belongs to the Special Issue Polymer Derived Ceramics and Applications

Classification DDC: 500 Science and mathematics > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 21 Nov 2023 13:45
Last Modified: 23 Nov 2023 13:21
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/16368
PPN: 513398260
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