Polytype analysis of SiC Powders by Raman spectroscopy

Goehlert, K.; Irmer, G.; Michalowsky, L.; Monecke, J.

doi:10.1016/0022-2860(90)80045-l

Cited by 12 publications

(4 citation statements)

References 5 publications

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“…Since the Raman scattering efficiency of SiC is relatively strong and signals with a high signal/noise ratio can be collected in a short time, Raman scattering spectroscopy has been used to identify polytype structures of SiC [30][31][32]. In addition, the folded modes of the transverse optic (FTO) and acoustic phonon (FTA) branches for different SiC polytypes are separately located.…”

Section: Effects Of B 4 C On the Phase Composition Of Porous Sic Ceramentioning

confidence: 99%

Effects of B4C on the microstructure and phase transformation of porous SiC ceramics

Guo

Xiao

Liu

et al. 2015

Ceramics International

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Section: Effects Of B 4 C On the Phase Composition Of Porous Sic Ceramentioning

confidence: 99%

Effects of B4C on the microstructure and phase transformation of porous SiC ceramics

Guo

Xiao

Liu

et al. 2015

Ceramics International

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“…There are only a few reports on the Raman investigation of polytype domains (domains with a single polytype structure) in SiC ceramics and powders. [27][28][29] It is of interest to examine to what extent the Raman scattering can be applied to the structural analysis of SiC ceramics and to compare the results of Raman and XRD measurements. In this paper we have tried to determine the contents of the polytype domains of SiC ceramics made under various conditions and compare those with the results of XRD analysis.…”

Section: Introductionmentioning

confidence: 99%

Raman Scattering Characterization of Polytype in Silicon Carbide Ceramics: Comparison with X‐ray Diffraction

Nakashima

Higashihira

Maeda

et al. 2003

Journal of the American Ceramic Society

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Raman scattering measurements have been made on SiC ceramics prepared from two powdered by sintering at different temperatures. The Raman spectra of starting powders have also been measured. The volume contents of the 4H and 15R polytype phases relative to that of the 6H phase in the ceramics are inferred from the Raman intensity of folded modes of the acoustic branches and compared with those determined from X-ray diffraction (XRD) analysis. A strong correlation is found between the results obtained from the two analyses. The 4H polytype contents estimated by Raman measurement for specimens prepared from one powder show a good agreement with those obtained by the XRD analysis. For the 15R polytype component there is a correlation between the contents inferred by the two techniques when the content is not very small. The results obtained by the two techniques demonstrate that the Raman spectroscopy as well as the XRD analysis is useful to study the natures and preparation conditions of SiC ceramics. N. P. Padture-contributing editor Manuscript No. 187808.

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“…5(b) from the point II. The sharp peaks in the region of 750-800 cm 1 (at 767, 788, and 796 cm 1 ) represent the transversal optical modes and that at 964 cm 1 the longitudinal optical modes of the polycrystalline SiC [28]. Also the bands of the graphite are detectable as D-peak at 1359 cm 1 and the G-peak at 1591 cm 1 [29].…”

Section: 1 Uninjured Surface Of Sicmentioning

confidence: 91%

Investigation on the laser ablation of SiC ceramics using micro‐Raman mapping technique

Yang

Huang

et al. 2016

J Adv Ceram

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Abstract:Research on the laser ablation behavior of SiC ceramics has great significance for the improvement of their anti-laser ability as high-performance mirrors in space and lasers, or the laser surface micro-machining technology as electronic components in micro-electron mechanical systems (MEMS). In this work, the laser ablation of SiC ceramics has been performed by using laser pulses of 12 ns duration at 1064 nm. The laser induced damage threshold (LIDT) below 0.1 J/cm 2 was obtained by 1-on-1 mode and its damage morphology appeared in the form of "burning crater" with a clear boundary. Micro-Raman mapping technique was first introduced in our study on the laser ablation mechanisms of SiC surface by identifying physical and chemical changes between uninjured and laser-ablated areas. It has been concluded that during the ablation process, SiC surface mainly underwent decomposition to the elemental Si and C, accompanied by some transformation of crystal orientation. The oxidation of SiC also took place but only in small amount on the edges of target region, while there was no hint of SiO 2 in the center with higher energy density, maybe because of deficiency of O 2 atmosphere in the ablated area, elimination of SiO 2 by carbon at 1505 ℃, or evaporating at 2230 ℃.

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Polytype analysis of SiC Powders by Raman spectroscopy

Cited by 12 publications

References 5 publications

Effects of B4C on the microstructure and phase transformation of porous SiC ceramics

Effects of B4C on the microstructure and phase transformation of porous SiC ceramics

Raman Scattering Characterization of Polytype in Silicon Carbide Ceramics: Comparison with X‐ray Diffraction

Investigation on the laser ablation of SiC ceramics using micro‐Raman mapping technique

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