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X‐ray powder data of Ca3TeO6 are shown not to allow an unambiguous indexing.
Crystals of γ. CsHCO3 are monoclinic, space group P21/c, with four molecules in a unit cell of dimensions a = 4.63, b = 11.20, c = 7.52 Å, β = 112°35′. The indexing of the X‐ray powder pattern and the morphological study are given.
The interpretation used by B. Khawas (Acta Cryst. (1970), B26, 1919; Acta Cryst. (1971), B27, 1517) of the quantity N20 occurring in the definition of the figure of merit M20 (P. M. de Wolff, J. Appl. Cryst. (1968), 1, 108) for the indexing of powder patterns is not that intended. Calculated...
X‐ray topography studies of scratches on discs of silicon crystals gave the following results. The damage field of each scratch consists of three zones of different kinds of distortions and exceeds the furrow dimensions in width as well as in depth by several orders of magnitude. Surrounding...
By means of several low temperature devices the solid hydrous phases of the AgI–NaI–H2O system have been extensively studied by X‐ray diffraction, transmission Laue photography, and polarizing microscopy. The density, composition and unit‐cell parameters have been determined for three...
A small‐angle X‐ray scattering study of glassy GeO2 is reported. Data were obtained from 4π sinθ/λ = 0.05 to 2.0 using a Kratky camera. The SAXS intensity decreased monotonically with decreasing angle from the main diffraction peak, and was not noticeably changed by hydrofluoric acid...
A geometric method for constructing computer‐generated transmission electron diffraction patterns is described. The program is written in Fortran for any crystal system and considers the variables: electron beam and reciprocal lattice (R.L.) spike orientation, spike length and crystal rotation....
The cell dimensions of W1−xTaxSe2 have been measured over the composition range 0 ≤x≤ 1. Apart from four weak unidentified lines whose intensity varies with method of preparation the X‐ray powder patterns show a hexagonal call for which c decreases and a increases linearly with x over the...
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