Rhombohedral crystal structure of compounds containing boron-rich icosahedra

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Abstract
The crystal structures of several icosahedral boron containing compounds have been refined using Mo Kα intensity data. Though these compounds, α‐boron, boron carbide, boron phosphide and boron arsenide, differ chemically, all have the same basic rhombohedral structure. The structures consist of icosahedral units bonded together with direct B‐B bonds as well as other linkage units. Similarities in electron distributions are found with respect to the icosahedra in all the compounds; differences are associated with the linkage units. The icosahedral bond distances show trends as one progresses along the series with increasing linkage units.

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