Results 201 to 210 of about 38,530 (252)

Fivefold twinned boron carbide nanowires

Nanotechnology, 2009
Chemical composition and crystal structure of fivefold twinned boron carbide nanowires have been determined by electron energy-loss spectroscopy and electron diffraction. The fivefold cyclic twinning relationship is confirmed by systematic axial rotation electron diffraction. Detailed chemical analysis reveals a carbon-rich boron carbide phase.
Xin, Fu, Jun, Jiang, Chao, Liu, Jun, Yuan   +3 more
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Massive Icosahedral Boron Carbide Crystals

The Journal of Physical Chemistry B, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Bingqing Wei, Robert Vajtai, Yung Joon Jung, Florian Banhart, Ganapathiraman Ramanath, Pulickel M. Ajayan   +5 more
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Advanced microstructure of boron carbide

Journal of Physics: Condensed Matter, 2012
The rhombohedral elementary cell of the complex boron carbide structure is composed of B(12) or B(11)C icosahedra and CBC, CBB or B□B (□, vacancy) linear arrangements, whose shares vary depending on the actual chemical compound. The evaluation of the IR phonon spectra of isotopically pure boron carbide yields the quantitative concentrations of these ...
Werheit, Helmut, Shalamberidze, Sulkhan
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Processing of silicon carbide–boron carbide–aluminium composites

Journal of the European Ceramic Society, 2009
Abstract The aim of this work was to shed light on the wetting mechanism in the SiC–B 4 C–Al system and to explore processing routes that enable infiltration of Al alloys into these ceramic powder mixtures without the formation of the deleterious reaction product Al 4 C 3 .
Arslan, Gürsoy, Kalemtaş, Ayşe
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Sintering of Boron and Boron Carbide

Journal of Solid State Chemistry, 2000
An investigation of sintering kinetics of boron and boron carbide is presented. The influence of the powder size distribution on the temperature dependence of sintering, on reaching a high final density, and on gaining a homogeneous grain size has been shown.
G.I. Kalandadze, S.O. Shalamberidze, A.B. Peikrishvili   +2 more
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Pressureless sintering of titanium carbide doped with boron or boron carbide

Journal of the European Ceramic Society, 2017
Abstract Titanium carbide ceramics with different contents of boron or B 4 C were pressureless sintered at temperatures from 2100 °C to 2300 °C. Due to the removal of oxide impurities, the onset temperature for TiC grain growth was lowered to 2100 °C and near fully dense (>98%) TiC ceramics were obtained at 2200 °C.
Yifeng Gu, Ji-Xuan Liu, Fangfang Xu, Guo-Jun Zhang   +3 more
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Photoluminescence of boron carbide

Journal of Solid State Chemistry, 2004
Abstract The excitation of B4.3C with an Ar-laser ( ℏω=2.4 eV ) yields a photoluminescence spectrum between about 1.56 and 1.58 eV with its main maximum at 1.563 eV and a weaker maximum at 1.572 eV. It is attributed to the indirect-allowed recombination of free excitons.
R. Schmechel, H. Werheit, T.U. Kampen, W. Mönch   +3 more
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Metallography of boron carbide

Metallography, 1976
A method of preparing B/sub 4/C for metallographic examination is described. The specimen is first cut with a diamond saw to produce a reasonably flat surface in order to reduce the grinding time. It is then mounted in a plastic material with pieces of a hard material (e.g., alumina) disposed around it to preserve flatness during grinding and polishing
B. Champagne, M. Beauvy, R. Angers
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Ceramics–Boron Carbide-Ferroelectrics

2021
This chapter brings together various studies on materials that happen to be ceramics. This includes Boron Carbide, (C11B) CBC or B4C, where we seek alloys or other changes to make it ductile, The BaTiO3 ferroelectric where we examined 90 and 180 degree domain wall boundaries, and Silica glass Applications to BaZrO3 electrolytes are
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Monoclinic boron carbide crystals

Journal of Structural Chemistry, 2017
The X-ray diffraction (XRD) study of boron carbide obtained by self-propagating high-temperature synthesis reveals monoclinic single crystals. This is in contradiction with the literature data that boron carbide crystals are hexagonal. According to the XRD data, hexagonal and monoclinic crystals of boron carbide have almost identical structures.
S. V. Konovalikhin, V. I. Ponomarev, G. V. Shilov, I. D. Kovalev   +3 more
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