The appearance of localized grain-boundary electronic states is shown to provide a reliable indication of intergranular fracture in polycrystalline materials. Representative densities of states are presented for some L1₂ intermetallic compounds by use of polyhedral models of grain-boundary structure. The role of certain segregated impurities as inhibitors of intergranular brittleness is briefly discussed and suggestions are made for direct experimental verification of our model.
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Eberhart et al. (1987) studied this question.
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