Changes in lattice parameter in high‐purity polycrystalline (2H δ ) aluminum nitride due to oxygen contamination have been examined by convergent beam electron diffraction. The operative lattice distortion was determined by computer simulation to be a continuous increase in c/a ratio commensurate with constant volume as impurity concentration increases and a fine break in hexagonal symmetry. These results are consistent with the distortions associated with planar polytypoid structures at higher oxygen levels.
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Callahan et al. (1992) studied this question.
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