Page "Carbide" Paragraph 11
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The carbides of silicon and boron are described as " covalent carbides ", although virtually all compounds of carbon exhibit some covalent character.
Boron carbide, B < sub > 4 </ sub > C, on the other hand, has an unusual structure which includes icosahedral boron units linked by carbon atoms.
Both silicon carbide ( also known as carborundum ) and boron carbide are very hard materials and refractory.
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