Titlebook: Boron; Volume 2: Preparatio Gerhart K. Gaulé Book 1965 Springer Science+Business Media New York 1965 chemistry.inorganic chemistry.preparat

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https://doi.org/10.1007/978-3-662-67317-1ts. The polycrystalline rods were then zone-refined to produce single crystals of boron. Single crystals thus produced were characterized in several ways. The techniques used and the results obtained are reported below.

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Purity of Boron Produced by the Decomposition of Diborane and Subsequent Zone-Melting The main impurity in our boron is carbon (30–50 ppm). Because of the unfavorable distribution coefficient for carbon in boron (approx. 4), removal by zone-refining is very time-consuming. A coulometric, method to determine carbon in boron is discussed.

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Preparation and Characterization of Single-Crystal Boronts. The polycrystalline rods were then zone-refined to produce single crystals of boron. Single crystals thus produced were characterized in several ways. The techniques used and the results obtained are reported below.

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Grundlagen der Objektorientierung,ubstitution reaction with BCl.. In the infrared spectrum of powdered .-boron, two bands can be assigned to vibrations of boron atoms belonging to the same icosahedron. In BeB. and in tetragonal boron, additional bands are observed which belong to the stretching frequencies of the bonds between neighboring icosahedrons.

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https://doi.org/10.1007/978-3-030-84887-3s not possible to determine where the band edges are located, where in the Brillouin zone the transitions between valence and conduction band take place, and whether these transitions will be direct or indirect. Optical measurements together with our group theoretical results could possibly lead to a band model for boron.