A single crystal neutron diffraction study of diaspore, AlO(OH)

A single-crystal neutron-diffraction study of diaspore has been made in which the intensities of ninety reflections of the hkO and Okl zones were measured. Unitcell dimensions and their standard errors as redetermined by the x- ray powder method are a = 4.401 plus or minus 0.001, b = 9.421 plus or minus 0.004, and c = 2.845 plus or minus 0.001 A. The structure was refined by the method of least squares using an anisatropic temperature factor for each atom. The Al and 0 position parameters obtained in this way are in good agreement with the x-ray results reported by Hoppe. The hydrogen bonding postulated by Ewing (1935) was confirmed. The H atom is located 0.990 A from 0/sub/ II/, but is not on the line of centers between 0/sub I/ and 0/sub II/. Instead the 0/sub II/-H bond makes an angle of 12.1 with the 0/sub II/-0/sub I/ vector. (auth)

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