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A systematic Raman-scattering investigation has been carried out on sol-gel alumina prepared by the hot-water hydrolysis and condensation of Al(OC4H9)3, the Yoldas process, as a function of process variables such as the time spent in the sol phase. Nanocrystalline boehmite, y-A1O(OH), is the principal component of these materials. We have found small but systematic changes, as a function of sol aging time, in the line shape and position of the dominant boehmite Raman band observed in thedoi:10.1103/physrevb.48.15626 pmid:10008113 fatcat:ogybujmdwnbvhon2btnl636ba4