Abstract
Interfaces in materials may be grain boundaries between like crystals or phase boundaries between unlike crystals. Experimental approaches for the determination of the atomic structures of the interfaces are reviewed with emphasis on high-resolution electron microscopy (HREM). It will be shown that information on orientation relationship between the adjacent grains, the translation state and atomic relaxations can be elaborated with high precision. In a case study, the structures of one specific grain boundary in Al2O3 will be discussed in detail. Such experimental studies have provided a mass of structural information in recent years.
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