Titlebook: Boron and Refractory Borides; Vlado I. Matkovich Book 1977 Springer-Verlag Berlin Heidelberg 1977 Beryllium.alkali metal.boron.carbon.chem

condemn

ARK

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

潛移默化

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

絕緣

優(yōu)雅

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: