与野兽博斗者
发表于 2025-3-28 17:11:54
,Simple Rhombohedral Boron—Preparation and Properties,mple rhombohedral boron has been crystallized from platinum melts. The necessary conditions are indicated. Some preliminary electrical and optical results for boron in the simple rhombohedral form are discussed and compared with results for boron that has been melted.
Debility
发表于 2025-3-28 22:12:06
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TIA742
发表于 2025-3-29 00:04:32
978-1-4899-6265-2Springer Science+Business Media New York 1960
Amenable
发表于 2025-3-29 03:04:37
Logistics Outsourcing RelationshipsSamples of crystalline boron were polished and reacted with various etchants. Several etching compositions are recommended because of the rather unusual reducing ability of boron.
DUST
发表于 2025-3-29 08:57:41
Some Etching Studies on Boron,Samples of crystalline boron were polished and reacted with various etchants. Several etching compositions are recommended because of the rather unusual reducing ability of boron.
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发表于 2025-3-29 14:31:46
Remarks on Structure and Polymorphism in Boron,. Half of the atoms in alpha-rhombohedral boron, the polymorph formed at lowest temperatures, are used in delta linkages between icosahedra, and the structure then satisfies the electron counting set by the essentially molecular Longuet-Higgins and Roberts bonding theory. More conventional and appar
注意
发表于 2025-3-29 16:37:43
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我不死扛
发表于 2025-3-29 23:04:11
The Manufacture of Boron,tely 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
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发表于 2025-3-30 01:34:10
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草率女
发表于 2025-3-30 05:55:46
Preparation of Crystalline Boron, (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