Abstract
The structure and crystallography of two special high-angle grain boundaries which have been observed in spinel are discussed in terms of coincident-site lattice concepts. The two grain boundaries correspond to relatively high-Σ values; the value of Σ = 99 is higher than that which is usually considered to be significant for grain boundaries. It is proposed that it is not the actual value of Σ which is important for these interfaces but rather the fact that the misorientations which are responsible for producing the grain boundaries cause several pairs of low-index crystal lattice planes to be nearly parallel to one another at the interface. The relationship between this interpretation and the frequent observation of both low-Σ interfaces and asymmetric grain boundaries in this and other materials is emphasized.
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