We describe the synthesis of bilayer graphene thin films deposited on insulating silicon carbide and report the characterization of their electronic band structure using angle-resolved photoemission. By selectively adjusting the carrier concentration in each layer, changes in the Coulomb potential led to control of the gap between valence and conduction bands. This control over the band structu...

abstract : alumina (al 2 o 3 ) is one of the most practical ceramics used in making ceramic-metal armours. to improve the properties of alumina, some other materials are added to it. in this paper, sic material as nano powder is added to alumina, and four armour samples of this new ceramic with different volume fractions (v.f. ) including 0%, 5%, 10% and 15% of sic particles are made. then, the...

In view of large interest in the improve of Al/Al alloy based Metal matrix Composite and high-temperature ceramics on the base of silicon carbide, a comprehensive review of the data on structure, properties and the known methods of processing of silicon carbide seems timely. The most striking feature of silicon carbide is its polytypism, i.e. formation of a great number of structural changes wi...

In-situ Neutron Diffraction and Small-Angle Scattering (SANS) are employed for the first time simultaneously in order to reveal interaction between austenite ferrite phase transformation precipitation kinetics during isothermal annealing at 650 700 °C three steels with different vanadium (V) carbon (C) concentrations. Austenite-to-ferrite is observed all both temperatures. The completed a 10 h ...

Herein we report on the synthesis of a new layered ternary carbide, viz. Mo2TiAlC2, that was synthesized by heating an elemental mixture at 1600 oC for 4 h under Ar flow. Its lattice parameters were calculated via Rietveld analysis of powder Xray diffraction patterns to be 2.997 Å and 18.661 Å. High-resolution scanning transmission electron microscopy further showed that this phase is ordered, ...

We report the emission of strong coherent broadband terahertz radiation from 6H-silicon-carbide SiC excited with optical pulses. The measured terahertz spectral signal-to-noise ratio is better than one thousand. We determine that the terahertz radiation is generated via second order optical nonlinearity optical rectification . We present a measurement of the ratio of nonlinear susceptibility te...

The intergranular corrosion susceptibility of ferritic stainless-steel weldments is strongly dependent on chromium carbide precipitation phenomena. Hence, stabilization widely used to mitigate the aforementioned precipitation. In contrast, has proved ineffective fully prevent due segregation unreacted during solid-state heat-treatments. To analyze behavior 17 wt.-% stainless steels laser weldin...