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1.
Kolker D. B. Sherstov I. V. Boiko A. A. Kostyukova N. Yu. Erushin E. Yu. Pavlyuk A. V. 《Journal of Applied Spectroscopy》2022,89(4):742-747
Journal of Applied Spectroscopy - The generation regimes of quantum-cascade lasers for optoacoustic sensors of methane and ammonia are examined, and the tuning and output characteristics of these... 相似文献
2.
A. A. Ryadun V. A. Nadolinny A. A. Pavlyuk S. F. Solodovnikov E. G. Boguslavskii 《Journal of Structural Chemistry》2013,54(1):59-64
An EPR study of Li2?2x Zn2+x (MoO4)3 crystals activated by copper ions shows that they occupy the M2 site, one of the three possible sites of both lithium and zinc. In the EPR spectra of Cu2+ copper a broadening of HFS lines and a nonequidistant splitting between them, which are unusual for the orientation H‖g zz , A zz , are observed. In this work possible reasons for such a broadening of HFS lines from copper ions are analyzed: a distortion of the oxygen octahedron due to the introduction of copper ions, second order perturbation theory corrections, superposition of HFS from 63Cu and 65Cu isotopes, and the effect of the charge redistribution in the oxygen octahedron because the cation vacancy providing charge compensation can be located at different distances from the copper ion. It is shown that the first three reasons do not explain the features observed in the EPR spectra. In the case of cation vacancies located in the M3 site and remote at different distances from the copper ion, the charge redistribution in the oxygen octahedron of copper should occur along with the dispersion of HFS parameters and the g-factor. The studies performed in X and Q bands confirm this assumption. The width of HFS lines from copper ions in the EPR spectra measured in the Q band is three times more compared to that measured in the X band. 相似文献
3.
Andrij Stetskiv Beata Rozdzynska‐Kielbik Volodymyr Pavlyuk 《Acta Crystallographica. Section C, Structural Chemistry》2013,69(7):683-688
A new ternary dithulium hexacobalt icosastannide, Tm2.22Co6Sn20, and a new quaternary thulium dilithium hexacobalt icosastannide, TmLi2Co6Sn20, crystallize as disordered variants of the binary cubic Cr23C6 structure type (cF116). 48 Sn atoms occupy sites of m.m2 symmetry, 32 Sn atoms sites of .3m symmetry, 24 Co atoms sites of 4m.m symmetry, eight Li (or Tm in the case of the ternary phase) atoms sites of symmetry and four Tm atoms sites of symmetry. The environment of one Tm atom is an 18‐vertex polyhedron and that of the second Tm (or Li) atom is a 16‐vertex polyhedron. Tetragonal antiprismatic coordination is observed for the Co atoms. Two Sn atoms are enclosed in a heavily deformed bicapped hexagonal prism and a monocapped hexagonal prism, respectively, and the environment of the third Sn atom is a 12‐vertex polyhedron. The electronic structures of both title compounds were calculated using the tight‐binding linear muffin‐tin orbital method in the atomic spheres approximation (TB–LMTO–ASA). Metallic bonding is dominant in these compounds, but the presence of Sn—Sn covalent dumbbells is also observed. 相似文献
4.
M. D. Pavlyuk V. M. Kanevskii Yu. M. Ivanov 《Russian Journal of Inorganic Chemistry》2013,58(8):964-967
The quality of detector single crystals is determined by the lifetime and mobility of nonequilibrium charge carriers, which depend on the purity of the components used for synthesis. An original setup for multistage vacuum distillation of Cd, Zn, and Te is designed, which is characterized by the simplicity of equipment and the minimal loss of the initial material. The purified materials have low contents of oxygen and metal impurities, which allow one to significantly increase the purity of the synthesized crystals. 相似文献
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V. A. Nadolinny A. A. Pavlyuk S. F. Solodovnikov Z. A. Solodovnikova E. S. Zolotova N. A. Nebogatikova V. F. Plyusnin A. A. Ryadun 《Journal of Structural Chemistry》2011,52(4):708-712
Based on the corrected phase diagrams proper growth conditions for Li2Zn2(MoO4)3 crystals are selected. Large crystals (up to 100 mm), both impurity-free and activated by transition metal ions (Cu, Cr),
are grown by the low-gradient Czochralski method. By the EPR method the charge state and structural position of copper and
chromium ions are determined. The performed studies of luminescent properties show that for impurity-free crystals luminescence
with λ = 388 nm with a two-exponential luminescence decay with τ1 = 2 ns and τ2 = 6 ns is observed at room temperature. At 77 K for both impurity-free crystals and those activated with transition metal
ions luminescence with λ = 560 nm and the luminescence lifetime τ = 100 ns is observed, the intensity of luminescence with
λ = 560 nm depending on the nature and concentration of transition metal ions. Cation vacancies responsible for the charge
compensation of impurity transition metal ions are assumed to be also responsible for low-temperature luminescence. 相似文献
8.
D.?Yu.?VelikovskiiEmail author M.?M.?Mazur A.?A.?Pavlyuk V.?E.?Pozhar S.?F.?Solodovnikov L.?I.?Yudanova 《Physics of Wave Phenomena》2015,23(1):58-62
A KLuW laser crystal is investigated as an acousto-optic material. It is shown that the crystal can be used in devices for controlling high-power laser radiation. Obtainable characteristics of promising classical devices (modulator, deflector) are estimated. A possibility of developing a new type of device for both lasing and Q-switching is analyzed. 相似文献
9.
S. N. Borisenko A. V. Bicherov O. V. Pavlyuk M. I. Rudnev N. I. Borisenko E. V. Vetrova V. I. Minkin R. N. Borisenko A. V. Lekar 《Russian Journal of Physical Chemistry B, Focus on Physics》2009,3(8):1131-1133
The isomerization of a non-racemic mixture of glaucine isomers to des-glaucine (seco-glaucine) in a subcritical water medium
at 200–300°C was conducted with a yield of 53%. The structure of the product was confirmed by NMR spectroscopy and electrospray-ionization
mass spectrometry. 相似文献
10.
V. P. D’yakonov É. E. Zubov A. A. Pavlyuk M. T. Borowiec H. Szymczak 《Physics of the Solid State》1999,41(4):605-609
The results of measuring the temperature and field dependences of the magnetization of a RbDy(WO4)2 single crystal in the temperature range from 4.2 to 50 K and in magnetic fields up to 1.6 T are presented. The energies of
the exchange and dipole-dipole interactions are estimated. The magnetic structure of the ground state is determined.
Fiz. Tverd. Tela (St. Petersburg) 41, 672–676 (April 1999) 相似文献