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In a binary chemically ordered network, each A atom is coordinated by exactly the same number (V) of B atoms. Hence, the network can be viewed as made up of well‐defined polyhedral (AB_V) structural units having an A atom in the center and a B atom at each vertex (i.e. corner). Further, C such structural units are connected in the network to each B atom. The chemical formula of the structural unit, AB_(V/C), is therefore the same as that of the network as a whole.