Ballerina
发表于 2025-3-25 07:18:51
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Adherent
发表于 2025-3-25 10:54:47
Jan Müller,André Wenzel,Rainer Laschtely 300 lb per month on continuous operation. The product averaged 96–98% boron and contained 1–3% carbon with minor amounts of iron and silicon..The central item of equipment comprised six 2 — in. -diam graphite rods, 4 ft long, which were mounted vertically, connected in series, and heated to a t
nonplus
发表于 2025-3-25 14:08:16
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chalice
发表于 2025-3-25 18:20:59
https://doi.org/10.1007/978-3-319-38836-6 (2) upgrading the Moissan boron to 95% B by heating with fluorides, and (3) heating the upgraded boron by radiation in a vacuum. The latter step is accomplished by cold-pressing the powder into rings, stacking the rings to form a hollow cylinder, and heating in excess of 2000°C by means of a resist
出价
发表于 2025-3-25 23:53:06
https://doi.org/10.1007/978-3-319-38836-6rown on a tantalum wire at 1500°C. Boron diffusion into the wire at this temperature was serious. B.C crystals up to 1 mm in diameter were grown on a graphite disk heated to 2000°C. Infrared transmission, resistivity, and hardness tests were made on the samples.
能量守恒
发表于 2025-3-26 00:34:09
Izabela Kudelska,Monika Kosacka-Olejnik obtained with boron and tantalum filaments. Boron crystal deposits 2 cm in diameter and 15 cm in length were deposited on small, vertical boron filaments..Two types of boron filaments were investigated, including (a) small bars grown by the Czochralski process from boron nitride containers and (b)
揉杂
发表于 2025-3-26 06:47:05
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Mhc-Molecule
发表于 2025-3-26 12:27:46
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faddish
发表于 2025-3-26 12:51:24
Ahmad E. Alozn,Moza S. Al Naimi,Omar Y. Asad to 1200°C..The unit cell is tetragonal; cell dimensions are: . = 10.12 A, . = 14.14 A. The measured density is 2.364 ± 0.005 g/cm., indicating that the unit cell contains 192 boron atoms, possibly arranged at the vertices of 16 icosahedra..Recent work with this phase indicates that the modification
jaundiced
发表于 2025-3-26 18:40:21
Bartłomiej Gładysz,Krzysztof Santarekseries of binary rare earth (and yttrium) for ides corresponding to the formula MB...The MB. preparation is isostructural with the previously reported UB. and ZrB.. The unit cell is face-centered cubic with four formula weights per unit cell..Details of lattice constants and structures are discussed