condemn
发表于 2025-4-1 03:16:08
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ARK
发表于 2025-4-1 09:40:28
Structural Determinants in the Higher Boridesthose in which boron atoms occupy the twelve vertices of an icosahedron or cubo-octahedron are the most common, although an octahedral unit consisting of six boron atoms at the vertices is well known and is characteristic of the hexaborides and tetraborides. This review is concerned with establishin
潜移默化
发表于 2025-4-1 13:58:56
Crystal Chemistry of Higher Boridesdered array of interstitial openings. When any of these sites is fully accupied by interstitial atoms, stoichiometries are obtained with integral atomic ratios. With this in mind, an attempt has been made in earlier publications to group the higher borides into isotypic series (Matkovich, 1961; Econ
绝缘
发表于 2025-4-1 18:05:34
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优雅
发表于 2025-4-1 20:21:36
Compounds Based on Octahedral B6 Units: Hexaborides and Tetraboridesds with atoms of the same octahedron and the fifth one points outwards along one of the A. axes of the octahedron. The presence of this fifth bond is responsible for the occurrence of the three-dimensional structure. Only two families of boron-rich borides have structures based on the B. octahedron: