排序方式: 共有26条查询结果,搜索用时 31 毫秒
1.
J. I. Gorina G. A. Kaljuzhnaia M. V. Golubkov V. V. Rodin T. A. Romanova N. N. Sentjurina S. G. Chernook 《Crystallography Reports》2016,61(2):315-319
A comprehensive analysis of the evolution of the structural and superconducting properties of FeSe crystals stored in air for several years has been performed. It is established that the structure and phase composition of the samples remained invariable, while the superconducting parameters significantly degraded. These changes may be due to the stress relaxation or redistribution of defects in the samples. 相似文献
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J. I. Gorina G. A. Kaljuzhnaya M. V. Golubkov V. V. Rodin N. N. Sentjurina V. A. Stepanov S. G. Chernook O. E. Omel’yanovskii A. V. Sadakov 《Crystallography Reports》2010,55(3):525-530
Layered oxycarbonate Bi2Sr4Cu2CO3O8 single crystals have been obtained for the first time by free growth in closed vapor-phase cavities. The morphology, structure,
composition, and superconducting properties of these crystals have been investigated. 相似文献
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V. S. Bagaev T. I. Galkina A. I. Sharkov A. Yu. Klokov V. P. Martovitskiĭ V. S. Krivobok Yu. V. Klevko S. G. Chernook 《Physics of the Solid State》2007,49(7):1241-1246
Propagation of nonequilibrium acoustic phonons in a coarse-grained ZnSe produced through chemical synthesis from a vapor phase was studied for phonons generated optically or by a metallic heater. The material is characterized by a microtwin structure in randomly oriented grains. Phonon transport studies, in combination with low-temperature photoluminescence, optical and electron microscopy, and x-ray diffraction analysis, made it possible to establish the decisive role played by extended defects in scattering of high-frequency acoustic phonons in this matterial. 相似文献
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Yu. I. Gorina G. A. Kalyuzhnaya V. V. Rodin N. N. Sentyurina V. A. Stepanov S. G. Chernook 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2008,2(4):663-668
High-quality Bi2 + x Sr2 ? y CuO6 + δ (Bi-2201) single crystals with the ratio Bi/Sr = 1.4–2.0 were grown by the free growth method in gas-filled cavities in KCl solution-melt in a range of doping levels, which provides variation in superconducting properties from insulators to optimally doped crystals. The charge composition Bi : Sr : Cu = 1.7 : 2.3 : 2.5 with excess Sr and Cu and synthesis conditions provided growth cavity formation in the KCl solution at the crystal growth stage. Lamellar single crystals and whiskers were grown under quasi-equilibrium conditions of lowered growth temperatures and partial oxygen pressure, achieved in closed gas-filled cavities. 相似文献
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V. V. Spesivtsev A. V. Spesivtsev V. V. Styrov Yu. I. Tyurin V. M. Chernook 《Reaction Kinetics and Catalysis Letters》1985,28(2):317-323
The dependence of luminescence intensity on the reaction conditions on oxide surfaces permits to determine the kinetic mechanism and gas-surface interaction constants. The suggested method was realized as a computer algorithm.
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Yu. I. Gorina G. A. Kalyuzhnaya N. N. Sentyurina V. A. Stepanov S. G. Chernook 《Crystallography Reports》2005,50(1):142-146
Perfect single crystals of the high-temperature superconductor Bi2Sr2CaCu2O8+δ with the superconducting transition temperature TC = 72–85 K (depending on the crystallization conditions) are obtained by the method of free growth in gas cavities formed in a KCl solution-melt. The specific features of the growth process are in the formation of an enclosed growth gas cavity in a (previously synthesized) blend of a specified phase composition dissolved in KCl and the free crystal growth in this cavity. The combination of growth and high-temperature annealing in the same process made it possible to obtain uniform (ΔTC = 1.5 K) single crystals with stable superconducting properties. Annealing of the grown single crystals in oxygen or in air in the temperature range 400–850°C confirmed that the crystals with maximum values of TC are optimally doped. 相似文献
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Golubkov M. V. Gorina J. I. Rodin V. V. Sentjurina N. N. Stepanov V. A. Chernook S. G. 《Crystallography Reports》2019,64(6):991-995
Crystallography Reports - The Fe1 + ySexTe1 – x single crystals grown by the KCl flux and Bridgman methods have been compared using the same investigation... 相似文献
10.
M. V. Golubkov Yu. I. Gorina G. A. Kalyuzhnaya D. A. Knyazev T. A. Romanova V. V. Rodin A. V. Sadakov N. N. Sentyurina V. A. Stepanov S. G. Chernook S. I. Vedeneev 《JETP Letters》2013,98(8):475-479
The observation of Shubnikov-de Haas and Hall oscillations in high-quality Bi2 ? x Cu x Se3 single crystals is reported. Measurements carried out upon rotating the samples with respect to the magnetic field demonstrate that the oscillations originate from two-dimensional surface states in three-dimensional single crystals and are determined only by the perpendicular component of the magnetic field. 相似文献