Abstract
A statistical mechanical theory which takes into account the effect of the polymeric structure on bond equilibrium has been extended to allow molecular clusters as well as single atoms to be treated as units in the polymer chains. This formally removes a previous limitation by allowing any multiply connected region of the molecule to be treated as a unit in a simply connected branched chain. Some of the problems in applying the theory to the equilibrium structure of a network-forming alloy such as As—Se are discussed.