ABSTRACT
DB is a metastable carbon polymorph at room temperature under atmospheric pressure. Its crystalline structure is a variant of the zinc blende, in which carbon atoms occupy all positions (both Zn and S), as indicated in Figure 21.1a. us, each carbon bonds to four other carbons, and these bonds are totally covalent by sp3 hybridization. is is appropriately called the diamond cubic crystal structure, which is also found for other group IVA elements in the Periodic Table.
