Abstract
The lattice vibrations of boehmite can be separated into O 2− translations, lying between 500 and 765 cm −1 and OH − translations, lying between 300 and 410 cm −1. Comparison of the i.r. spectra of random and oriented preparations of platy crystals allows the recognition of transition moments perpendicular to the plates. Bands additional to those required by the statistical symmetry indicated by diffraction ( D 17 2 h , Cmcm) establish that the true space group must be C 12 2 v ( Cmc2 1), each domain of which probably extends over an entire hydrogen bonded double hydroxyl sheet.
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