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Formation of Nanoscale Cracks and Fractoluminescence upon Destruction of Carbon Ceramics
- Source :
- Physics of the Solid State. 62:2089-2093
- Publication Year :
- 2020
- Publisher :
- Pleiades Publishing Ltd, 2020.
-
Abstract
- We obtained a Raman spectrum for a surface layer of porous carbon ceramic (porosity ≈5%) of ≈80 nm thick. The analysis of the spectrum showed that the ceramics contain crystals of silicon carbide 6H‑SiC and silicon. The destruction of ceramics by diamond microcrystals resulted in fractoluminescence (FL). Its spectrum contained two bands at 1.6 and 1.9 eV. The first is emerged at the destruction of silicon crystals, and the second is emerged at 6H-SiC crystals. We obtained the time dependence of the intensity of the fractoluminescence signals with a time resolution of 2 ns. Three types of signals were observed: one is formed when the 6H-SiC crystals are destroyed; the second is formed when silicon crystals are destroyed; the third is formed when these crystals are simultaneously destroyed. The appearance of signals is associated with the formation of cracks arising from the breakthrough of barriers formed at the intersection of slip planes of dislocations in silicon carbide and silicon crystals. The size of cracks in 6H-SiC has been estimated: the smallest is 5.5 nm, and the largest is ≈18 nm.
- Subjects :
- 010302 applied physics
Materials science
Silicon
chemistry.chemical_element
Diamond
engineering.material
Condensed Matter Physics
01 natural sciences
Electronic, Optical and Magnetic Materials
chemistry.chemical_compound
symbols.namesake
chemistry
visual_art
0103 physical sciences
visual_art.visual_art_medium
engineering
Silicon carbide
symbols
Ceramic
Surface layer
Composite material
010306 general physics
Porosity
Raman spectroscopy
Carbon
Subjects
Details
- ISSN :
- 10906460 and 10637834
- Volume :
- 62
- Database :
- OpenAIRE
- Journal :
- Physics of the Solid State
- Accession number :
- edsair.doi...........0abaf59b0ce59ba4cdf2934c9c1a3c0d