Identification and Kinetic Properties of the Photosensitive Impurities and Defects in High-Purity Semi-Insulating Silicon Carbide

The magnetic properties of single crystals of synthetic diamond and crystals of silicon carbide were studied. High-purity samples of diamonds synthesized with HPHT and CVD technologies were used. The crystals of silicon carbide were grown by sublimation and industrial technology. Along with samples with a natural isotopic composition, monoisotopic crystals of diamond (99.96% 12C and 99.96% 13C) and silicon carbide (99.993% of 28Si) were studied. On the basis of the data obtained, the diamagnetic susceptibility was determined and the concentration of paramagnetic centers and the content of the ferromagnetic component were evaluated. The results are discussed.

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A cleaner, sustainable approach for synthesising high purity silicon carbide and silicon nitride nanopowders using macadamia shell waste

Journal of Cleaner Production ◽

10.1016/j.jclepro.2016.06.029 ◽

2016 ◽

Vol 133 ◽

pp. 1277-1282 ◽

Cited By ~ 17

Author(s):

Ravindra Rajarao ◽

Veena Sahajwalla

Keyword(s):

Silicon Carbide ◽

Silicon Nitride ◽

High Purity ◽

Shell Waste ◽

High Purity Silicon

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ChemInform Abstract: SELF-DIFFUSION OF CARBON-14 IN HIGH-PURITY AND NITROGEN-DOPED α-SILICON CARBIDE SINGLE CRYSTALS

Chemischer Informationsdienst ◽

10.1002/chin.198102005 ◽

1981 ◽

Vol 12 (2) ◽

Author(s):

J. D. HONG ◽

R. F. DAVIS

Keyword(s):

Silicon Carbide ◽

Single Crystals ◽

High Purity ◽

Nitrogen Doped ◽

Self Diffusion ◽

Carbon 14

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The influence of palladium impurities on vacancy diffusion in cubic silicon carbide

MRS Proceedings ◽

10.1557/proc-1264-bb06-03 ◽

2010 ◽

Vol 1264 ◽

Author(s):

Guido Roma

Keyword(s):

Silicon Carbide ◽

First Principles ◽

Kinetic Properties ◽

Vacancy Diffusion ◽

First Principles Calculations ◽

Low Concentrations ◽

Diffusion Mechanisms ◽

Cubic Silicon Carbide ◽

As Solubility ◽

Correlation Factors

AbstractThe basic properties of palladium impurities in silicon carbide, such as solubility or diffusion mechanisms, are far from being well understood. In a recent paper I presented a systematic study of stability and kinetic properties of Pd in cubic silicon carbide using first principles calculations. In this paper I focus on the effect of the presence of palladium in silicon carbide, even in very low concentrations, on the kinetic properties of carbon vacancies. I apply a odel of Pd diffusion through a vacancy mechanism on the carbon sublattice and extract the correlation factors leading to an enhancement of vacancy migration, due to the coupling of iffusion fluxes between vacancies and palladium impurities.

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Determination of trace metals in high purity silica, silicon nitride and silicon carbide by ICP-AES after separation with mini-column chelating resin.

BUNSEKI KAGAKU ◽

10.2116/bunsekikagaku.39.6_t83 ◽

1990 ◽

Vol 39 (6) ◽

pp. T83-T87 ◽

Cited By ~ 3

Author(s):

Hiroyasu YOSHIKAWA ◽

Youichi ISHIBASHI ◽

Naoki GUNJI ◽

Kouichi SASAYAMA ◽

Takeshi MISUMI

Keyword(s):

Silicon Carbide ◽

Silicon Nitride ◽

Trace Metals ◽

High Purity ◽

Chelating Resin

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Evaluation of Trace Impurities in the Preparation of High-Purity Silicon Carbide

Journal of The Electrochemical Society ◽

10.1149/1.3087208 ◽

1966 ◽

Vol 113 (11) ◽

pp. 1215 ◽

Cited By ~ 9

Author(s):

D. L. Barrett

Keyword(s):

Silicon Carbide ◽

High Purity ◽

Trace Impurities ◽

High Purity Silicon

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Synthesis of Silicon Carbide Powders from Methyl-Modified Silica Aerogels

Applied Sciences ◽

10.3390/app10186161 ◽

2020 ◽

Vol 10 (18) ◽

pp. 6161

Author(s):

Kyoung-Jin Lee ◽

Yanggu Kang ◽

Young Hun Kim ◽

Se Won Baek ◽

Haejin Hwang

Keyword(s):

Silicon Carbide ◽

High Purity ◽

Silica Aerogel ◽

Carbothermal Reduction ◽

Single Phase ◽

Phase Evolution ◽

Silica Aerogels ◽

Methyl Groups ◽

Modified Silica ◽

Lower Temperature

β-silicon carbide (SiC) powders were synthesized by the carbothermal reduction of methyl-modified silica aerogel/carbon mixtures. The correlations between the phase evolution and morphologies of the SiC powders and the C/SiO2 ratio were investigated. At a C/SiO2 ratio of 3, β-SiC formed at 1425 °C and single-phase SiC powders were obtained at 1525 °C. The methyl groups (-CH3) on the silica aerogel surfaces played important roles in the formation of SiC during the carbothermal reduction. SiC could be synthesized from the silica aerogel/carbon mixtures under lower temperature and C/SiO2 ratios than those needed for quartz or hydrophilic silica. The morphology of the SiC powder depended on the C/SiO2 ratio. A low C/SiO2 ratio resulted in β-SiC powder with spherical morphology, while agglomerates consisting of fine SiC particles were obtained at the C/SiO2 ratio of 3. High-purity SiC powder (99.95%) could be obtained with C/SiO2 = 0.5 and 3 at 1525 °C for 5 h.

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