Abstract
Broad, rounded draperylike platelet growths result from the oxidation of unannealed iron in dry oxygen at 400°C. Their skewed sandwich structure is a new type of twinning in which the composition plane is a twist grain boundary. This twin interface and the platelet faces are on the basal plane. A 13.174° twist angle is common; 21.787°, 26.66°, and 35.22° were also found. Such a rounded platelet would be expected to result from the proposed internal diffusion mechanism.
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