Results 261 to 270 of about 853 (298)
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Vapor transport of boron, boron phosphide and boron arsenide
Journal of Crystal Growth, 1967Abstract Small crystals of boron, boron phosphide and boron arsenide have been produced by chemical vapor transport using halogens as transporting reagent. In all cases the material transported from a higher to a lower temperature. The boron phosphide and boron arsenide produced were cubic while the boron was beta-rhom-bohedral.
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The structure of boron in boron fibres
Journal of Materials Science, 1983The structure of noncrystalline, chemically vapour-deposited boron fibres was investigated by computer modelling the experimentally obtained X-ray diffraction patterns. The diffraction patterns from the models were computed using the Debye scattering equation.
Jayant Bhardwaj, Aaron D. Krawitz
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Boronizing in a boron trichloride atmosphere
Metal Science and Heat Treatment of Metals, 19601. The practicability of gas boronizing at 700–750° C in a BCl3H2 atmosphere was demonstrated. 2. The recommended boronizing procedure is: temperature −850° C, holding time-3–6 hrs., ratio of boron trichloride to hydrogen-about 0.05. 3.
M. A. Pchelkina, Yu. M. Lakhtin
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Sintering of Boron and Boron Carbide
Journal of Solid State Chemistry, 2000An 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 +2 more
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Science, 1983
Sillimanite in six granulite-facies, kornerupine-bearing rocks contains 0.035 to 0.43 percent B2O3and 0.02 to 0.23 percent MgO (by weight). Substitution of boron for silicon and magnesium for aluminum is coupled such that the ratio of magnesium to boron is about 0.5.
Grew, Edward S., Hinthorne, James R.
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Sillimanite in six granulite-facies, kornerupine-bearing rocks contains 0.035 to 0.43 percent B2O3and 0.02 to 0.23 percent MgO (by weight). Substitution of boron for silicon and magnesium for aluminum is coupled such that the ratio of magnesium to boron is about 0.5.
Grew, Edward S., Hinthorne, James R.
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Journal of Renal Nutrition, 2005
Boron, the fifth element in the periodic table, is ubiquitous in nature. It is present in food and in surface and ocean waters, and is frequently used in industrial, cosmetic, and medical settings. Exposure to boron and related compounds has been recently implicated as a potential cause of chronic kidney disease in Southeast Asia.
Madeleine V, Pahl +2 more
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Boron, the fifth element in the periodic table, is ubiquitous in nature. It is present in food and in surface and ocean waters, and is frequently used in industrial, cosmetic, and medical settings. Exposure to boron and related compounds has been recently implicated as a potential cause of chronic kidney disease in Southeast Asia.
Madeleine V, Pahl +2 more
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2012
A basic overview of essential aspects of the very rich chemistry of boron is discussed to elucidate the structural behavior and chemical properties of boron-containing molecules. Some introductory elements are provided concerning the peculiar chemical properties of boron, which derive from its electronic configuration, bonding orbitals, and ...
Panza, L, PROSPERI, DAVIDE
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A basic overview of essential aspects of the very rich chemistry of boron is discussed to elucidate the structural behavior and chemical properties of boron-containing molecules. Some introductory elements are provided concerning the peculiar chemical properties of boron, which derive from its electronic configuration, bonding orbitals, and ...
Panza, L, PROSPERI, DAVIDE
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Asymmetric twins in boron rich boron carbide
Physical Chemistry Chemical Physics, 2018Twin boundaries (TBs) play an essential role in enhancing the mechanical, electronic and transport properties of polycrystalline materials.
Xiaokun Yang, William A. Goddard, Qi An
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In Vivo and In Vitro Effects of Boron and Boronated Compounds
Journal of Trace Elements in Medicine and Biology, 1998Boron is ubiquitously present in soils and water. Associated with pectin it is essential for vascular plants as a component of cell walls, and it stabilizes cell membranes. It is required for the growth of pollen tubes and is involved in membrane transport, stimulating H(+)-pumping ATPase activity and K+ uptake.
M, Benderdour +3 more
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Studies in Boron-Oxygen, Boron-Nitrogen and Boron-Sulphur Bonded Complexes
Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry, 1983Abstract Reactions of 2-isopropoxy-1,3,2-benzodioxaborole and 2-isopropoxy-1,3-dithiaborole with benzaldehyde-2-mercaptoanil in equimolar ratio and salicylaldehyde-2-mercaptoanil and 2-hydroxyacetophenone-2-mercaptoanil in 1:1 and 2:1 (boron: ligand) molar ratios have yielded a new class of coordination compounds of boron. The resulting (where Z = C6H4
Laxmi Bhal, R. V. Singh, J. P. Tandon
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