Characterization of silicon carbide-silicon nitride composite ultrafine particles synthesized using a CO{sub 2} laser by silicon-29 magic angle spinning NMR and ESR

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08364.x· OSTI ID:182646

Suzuki, Masaaki; Hasegawa, Yoshihisa; Aizawa, Masayuki; Nakata, Yoshinori; Okutani, Takeshi ^[1]; Uosaki, Kohei ^[2]

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1. Hokkaido National Industrial Research Inst., Sapporo (Japan)
2. Hokkaido Univ., Sapporo (Japan). Dept. of Chemistry

The structure of silicon carbide-silicon nitride (SiC-Si{sub 3}N{sub 4}) composite particles synthesized using a CO{sub 2} laser was studied by magic angle spinning nuclear magnetic resonance (MAS-NMR) and electron spin resonance (ESR). The structure around Si atoms changed by introducing N. C atoms around Si were substituted by N atoms, and N-rich configurations around Si atoms increased stepwise as the N content increased. The low N content composite particles consisted of mainly SiC phase containing dissolved N. N atoms were partly present in {beta}-SiC microcrystal and partly in the grain boundary layer in the particle. N atoms were tetrahedrally surrounded by four Si atoms in {beta}-SiC microcrystal and were trivalent state bonded to three Si atoms in the grain boundary layer. The high N content particles consisted of SiC, Si{sub 3}N{sub 4}, and amorphous phases, whose amount depended on N content.

• Sponsoring Organization: USDOE
• OSTI ID: 182646
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMMONIA
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
ELECTRON SPIN RESONANCE
ELECTRONIC STRUCTURE
ETHYLENE
NUCLEAR MAGNETIC RESONANCE
SILANES
SILICON CARBIDES
SILICON NITRIDES
SPIN-LATTICE RELAXATION
SYNTHESIS
X-RAY DIFFRACTION