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Conductive SiC ceramics fabricated by spark plasma sintering
- Source :
- Ceramics International. 42:17892-17896
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- Bulk SiC ceramics were fabricated by spark plasma sintering, and the effects of Y 2 O 3 addition on the structural and electrical properties were investigated. Raman spectroscopy revealed that SiC specimens with low Y 2 O 3 content (0.01 and 0.05 wt%) contained a graphitic phase (1580 and 2710 cm −1 ) which was insignificant for high Y 2 O 3 content (1.0 and 5.0 wt%). Carbon-rich SiC specimens exhibited p-type conduction character, while others exhibited n-type character. The p- and n-type SiC specimens had electrical resistivities around 10 −2 Ω cm but exhibited photoluminescence spectra quite different from each other. The p-type character is primarily attributable to silicon vacancies (V Si ), while the n-type character is ascribed to nitrogen substitution in carbon sites (N C ) of the zincblende lattice. The change in conduction type with yttria addition in the SiC specimen can be understood in terms of a competition between the densities of V Si and N C .
- Subjects :
- Photoluminescence
Materials science
Silicon
Analytical chemistry
Spark plasma sintering
chemistry.chemical_element
02 engineering and technology
01 natural sciences
symbols.namesake
0103 physical sciences
Materials Chemistry
Ceramic
Electrical conductor
Yttria-stabilized zirconia
010302 applied physics
Process Chemistry and Technology
021001 nanoscience & nanotechnology
Thermal conduction
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
chemistry
visual_art
Ceramics and Composites
symbols
visual_art.visual_art_medium
0210 nano-technology
Raman spectroscopy
Subjects
Details
- ISSN :
- 02728842
- Volume :
- 42
- Database :
- OpenAIRE
- Journal :
- Ceramics International
- Accession number :
- edsair.doi...........8264244fa7fc34f33ca0d46fc3535c7e