S. N. Sulyanov

The belok station for protein crystallography on the synchrotron radiation beam from the bending magnet in the Sibir-2 storage ring

Design modifications made in the initial project of the Belok station in the Sibir-2 storage ring and the alignment and calibration methods are considered. The main operating parameters of the station are reported. Protein single crystals in a capillary at T = 293 K and without a capillary at T = 95 K, powders (angular resolution Δ2ϑ = 0.04°), and nanocrystalline Na and Cl2 precipitates (sizes, shape, and orientation) in electron-irradiated NaCl crystals have been investigated. The problem of focusing of a short-wavelength synchrotron radiation beam with sagittal bending of the second crystal in the double-crystal monochromator at a limited source-to-sample distance is solved in the Belok project.

Nanostructured crystals of the fluorite phases Sr1 − xRxF2 + x(R—rare-earth elements) and their ordering: II. Crystal structure of the ordered Sr4Lu3F17 phase

AbstractThe crystal structure of the ordered phase Sr4Lu3F17 prepared by directed crystallization of the melt has been investigated. The crystals have a trigonally distorted fluorite lattice (space group R % MathType!MTEF!2!1!+- % feaagaart1ev2aaatCvAUfKttLearuqr1ngBPrgarmWu51MyVXgatC % vAUfeBSjuyZL2yd9gzLbvyNv2CaeHbd9wDYLwzYbItLDharyavP1wz % ZbItLDhis9wBH5garqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbb % L8F4rqqrFfpeea0xe9Lq-Jc9vqaqpepm0xbba9pwe9Q8fs0-yqaqpe % pae9pg0FirpepeKkFr0xfr-xfr-xb9adbaqaaeGaciGaaiaabeqaam % aaeaqbaaGcbaGafG4mamJbaebaaaa!3BD7!

Size control and structure features of spherical calcium carbonate particles

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Nanostructured crystals of fluorite phases Sr1 − xRxF2 + x and their ordering: 9. The defect crystal and real structure of quenched fluorite phases Sr1 − xCexF2 + x (x = 0–0.5)

, Z = 6, a = 10.615(2) Å, c = 19.547(6) Å). The Sr4Lu3F17 phase is isostructural to Ba4R3F17 (R = Y, Yb). The distortions of the fluorite cation sublattice manifest themselves in the splitting of the only mixed position (Sr, Lu) into three positions: Sr(1), Sr(2), and Lu. All Lu3+ atoms are displaced from the center of the [Sr8{Lu6F36 + 1}F32] octacubic cluster in the [001]cub direction, and the Sr(1) cations are displaced toward the center of the octacubic cluster in the [111]cub direction. The coordination numbers of the Lu, Sr(1), and Sr(2) cations are 8, 10, and 11, respectively. The distortions of the fluorite anion sublattice are caused by the incorporation of additional anions into both the center of the octacubic cluster and the {F8} cubic holes outside the cluster.

Supersmooth and modified surface of sapphire crystals: Formation, characterization, and applications in nanotechnologies

A new method for modifying polyelectrolyte capsule shells by magnetic nanoparticles is proposed: the in situ synthesis of magnetite by chemical condensation. The capsule cores were spherical calcium carbonate microparticles, while polymer shells were prepared using the layer-by-layer electrostatic adsorption of polyallylamine and polystyrene sulfonate. After in situ synthesis, nanoparticles of different shapes are formed on the capsule shell; the main crystalline phase of nanoparticles is magnetite. The thus obtained nanocomposite capsules are highly sensitive to external magnetic fields.

Evolution of the vanadium pentoxide V 2 O 5 crystal surface after vacuum annealing

The size of porous spherical calcium carbonate particles obtained by precipitation from a supersaturated solution has been controlled using bovine serum albumin as an organic additive and ethylene glycol and glycerol as cosolvents of the reaction mixture. The structural aspects of the formation of these particles, which affect the possibility of controlling their sizes, are considered. Highly porous vaterite particles with an average size of about 500 nm have been obtained by adding ethylene glycol and glycerol to the reaction mixture and agitation for no less than 30 min. It is shown that particles are formed as a result of the attachment of vaterite nanocrystallites, the shape of which is anisotropic and can be described by a biaxial ellipsoid.

Station for X-ray structural analysis of materials and single crystals (including nanocrystals) on a synchrotron radiation beam from the wiggler at the Siberia-2 storage ring

AbstractSingle crystals of the Ca1 − xScxF2 + x(x = 0.106, 0.132, 0.156) solid solutions (CaF2 structure type, space group Fm