Synthesis and structural peculiarities of nonstoichiometric β-SiC

Microwave dielectric properties of SiC(B) solid solution powder prepared by sol–gel

“…The peak at 1345 cm −1 is similar to the TO peak of diamond, which is indicative of the presence of C-C sp 3 bonds in ␤-SiC. Most probably the bonds are caused by carbon antisites in the SiC structure because of the lowest defect formation energy (1.1 eV) of C Si in ␤-SiC [14]. Namely, the prepared SiC is C-enriched SiC which is a more suitable material for p-type doping, e.g.…”

“…It is found that the intensities of peaks of the sample synthesized at 1800 • C are much greater than that of the sample synthesized at 1700 • C. As it can be seen, there are not any peaks of boride in all the products. Additionally, when the fired temperature is above 1700 • C, the additional peak observed at d = 2.66 Å is believed to be due to the stacking faults in ␤-SiC crystal [14].…”

The Structurization of Aluminum Oxide Composite Ceramics Involving Products of Iron Oxide Reduction by Nanosized Nonstoichiometric Silicon Carbide

“…The powder material was produced from nonstoichiometric silicon carbide (solid solution of carbon in silicon carbide, SiC-C) [7,8], iron oxide red pigment -Fe 2 O 3 (as per TU 6-10-2029-86), and fine powder of sintered iron ore concentrate (SIOC) as pellets, produced by the Poltava Mining and Processing Plant (as per TU 14-9-385-92). The powder components were mixed in a planetary-ball mill in ceramic drums with carbide balls (WC-Co) in distilled water for 1 h. The powder-to-ball mass ratio was 1 : 6.…”

Structurization of composite ceramics based on stoichiometric silicon carbide during free sintering and hot pressing

“…Deformation defects of the micron alumina grains are very dense. The silicon carbide grains are identified by typical contrast due to the high concentration of initial growth defects caused by planar carbon clusters [4]. This may be evidence of the structural stability of the solid solution of carbon in silicon carbide when ceramics is formed.…”