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[en] A method for measuring the curvature of single crystals on a triple-crystal X-ray diffractometer has been developed for the Bragg geometry. The divergence of the X-ray radiation from the third crystal (a specimen) is determined by the angle formed by the tangents at the points of incidence of the end rays of the beam incident onto a bent crystal. A formula is obtained that relates the width of a diffraction maximum to the curvature radius of the crystal studied

[en] In the course of the investigation of phase equilibria in Zr-Co-In and Zr-Ni-In systems at 870 K, ternary compounds Zr₂M₂In (M = Ni, Co) were found at a section of 0.40 atomic fractions of Zr. The X-ray structure analysis was performed for a single crystal from the Zr-Ni-In system. A single crystal in the form of a parallelepiped was extracted from the Zr_0.40Ni_0.40In_0.20 alloy annealed at 870 K. The tetragonal system was determined by the Laue method, and the unit-cell dimensions were found from rotation photographs. The X-ray data were collected on an automated DARCH-1 diffractometer (MoKα radiation, graphite monochromator, 2θ_max = 75 degrees). The unit-cell constants were refined to a = 7.173(2) and c = 3.338(1) Angstrom. The structure was solved by direct methods in the sp. gr. P4/mbm, Z = 2. The CSD package for the IBM PC was used. Atomic parameters were refined to R = 0.0269 for 183 independent reflections with I > 4σ(I). 2 refs., 2 tabs

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