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The crystal structure of an ordered Au–33at.%Cd alloy has been reinvestigated by X‐ray diffraction. Least‐squares refinement using single‐crystal intensity data collected by photographic methods has shown that mixed occupation by the two kinds of atoms preferentially occurs in the atomic sites...
Using a modified Laue method as well as electron diffraction and lattice image methods, two new poly types of SiC, 93R and 261R, have been found which belong to a new structure family ((44)n43)3 based on 8H (44) stacking.
The X‐ray powder data have been obtained for a new phase MoGa5(CuS2)0.0556. The powder patterns were indexed on the basis of a tetragonal body‐centred unit cell with the lattice constants a = 12.872, c = 5.284 Å, c/a = 0.410, dm = 6.825(8), dx = 6.869 Mg m−3, Z = 8.
Monoclinic Gd2SiO5 has been investigated by high-resolution electron microscopy (HREM) at 100 kV. Structure images are observed in the 100 and 001 projections and calculations of the image contrast using the multislice approximation are carried out to interpret the observations. For thin samples...
NH(CH3)3GeCl3, C3H10N+.Ge2+.3Cl−, crystallizes at room temperature in an orthorhombic modification with a = 9.537(2), b = 8.235(2), c = 12.138(2) Å, Z = 4, space group Cmc21. These cell parameters correspond to a derivative of the cubic perovskite structure type, with a≃b≃acubic and c≃ 2acubic....
An experimental method is described for the determination of crystallite dimensions in polycrystalline materials. It is based on studying the geometry of streaks that appear in powder photographs taken with white X‐ray radiation. A detailed analysis is presented that includes a differentiation...
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