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1.
Crystallization in the Ho2O3(Yb2O3)GeO2KFH2O systems has been investigated under hydrothermal conditions. Crystallization fields of the crystalline phases have been determined. Single crystals of Ho2Ge2O7, Yb2Ge2O7 (two types), K2HoF5, K2YbF5, KxYbyGepOq (P-type), Ho(OH)3, Yb(OH)3, and K2Ge4O9 have been obtained. The germanates synthesized have been studied by X-ray analysis and infrared-spectroscopy. Diorthogermanate Yb2Ge2O7 has been found to crystallize in two structural types; the first is characterized by the usual structure that is typical for rare-earth germanates, the second is new for germanates of rare-earth elements. High chemical resistance is typical of these crystals. The P-type germanate also has a new type of structure among rare earth germanates. Some suggestions are made as to the structure of these new germanates on the basis of X-ray and ir-spectroscopic data. 相似文献
2.
L. Ya. Vinnikov L. A. Gurevich G. A. Emelchenko G. A. Kazaryan N. N. Kolesnikov M. P. Kulakov D. Ya. Lenchinenko Yu. A. Ossipyan 《Solid State Communications》1989,70(12):1145-1146
The flux-line lattice (FLL) has been observed on the (001) face of high Tc Bi2.2Sr2CaCu2OX and Ti2Ba2CaCu2OX single cristals using the technique of decorating the sample with small ferromagnetic particles. Strong pinning of the Abrikosov vortices by plane defects along (100) and (010) planes has been found out on Bi2.2Sr2CaCu2OX. The triangular FLL with a long-range order has been observed on the perfect Ti2Ba2CaCu2OX single crystal. The penetration depth for a magnetic field parallel to (001) axis has been evaluated as ≤0.2μm at 4.2K for both materials. 相似文献
3.
Rudneva E. B. Manomenova V. L. Sorokina N. I. Verin I. A. Grebenev V. V. Lyasnikova M. S. Koldaeva M. V. Voloshin A. E. Masalov V. M. Zhokhov A. A. Emelchenko G. A. 《JETP Letters》2018,108(12):801-805
The microhardness and thermal stability of mixed K2CoxNi1–x(SO4)2 · 6H2O crystals have been studied for the {110} and {001} growth sectors. Maxima of the onset temperature of dehydration have been found at x ≈ 0.1 and x ≈ 0.9. The structure of the {110} and {001} growth sectors has been studied. The observed changes in the properties have been attributed to the degree of imperfection of crystals depending on their sectoral inhomogeneity.
相似文献4.
Koldaeva M. V. Rudneva E. B. Manomenova V. L. Voloshin A. E. Masalov V. M. Zhokhov A. A. Emelchenko G. A. 《Crystallography Reports》2019,64(6):926-931
Crystallography Reports - K2Ni(SO4)2 · 6H2O (KNSH), K2Co(SO4)2 · 6H2O (KCSH), and K2NixCo(1 – x)(SO4)2 · 6H2O (KCNSH) crystals have been grown by traditional... 相似文献
5.
V. V. Zalamai V. V. Ursaki C. Klingshirn H. Kalt G. A. Emelchenko A. N. Redkin 《Applied physics. B, Lasers and optics》2009,97(4):817-823
A vertically arranged nearly parallel array of ZnO nanorods and randomly oriented nanowires has been grown by low pressure
chemical vapor deposition (CVD) on silica substrates and on stainless steel gauze woven from a wire with a diameter of 40 μm,
respectively. The quality of the produced material is high enough to act as a gain medium for stimulated emission in the ultraviolet
spectral region. Multiple sharp lasing peaks were realized from single hexagonal nanorods and arrays of hexagonal ZnO nanorods.
The lasing peaks display successive onset and saturation with increasing excitation power density and fit well the expected
resonance spectrum of guided modes in hexagonal nanorods. The behavior of lasing spectra from shot to shot of pumping in randomly
oriented nanowires along with the independence of the lasing threshold on the excitation spot area suggest that the emission
spectrum results from the superposition of lasing modes in individual nanowires, rather than from random lasing due to photon
coherent scattering. 相似文献
6.
Vasilyeva N. A. Rudneva E. B. Manomenova V. L. Grigoriev Yu. V. Masalov V. M. Zhokhov A. A. Emelchenko G. A. Voloshin A. E. 《Crystallography Reports》2019,64(5):828-833
Crystallography Reports - Mixed crystals of potassium?cobalt sulfate hexahydrate/potassium?nickel sulfate hexahydrate (K2Co(SO4)2 · 6H2O/K2Ni(SO4)2 · 6H2O (KCNSH)) have been... 相似文献
7.
Grebenev V. V. Kovalyov S. I. Voloshin A. E. Manomenova V. L. Rudneva E. B. Vorontsov D. A. Vasilyeva N. A. Masalov V. M. Zhokhov A. A. Emelchenko G. A. 《Crystallography Reports》2017,62(6):983-992
Crystallography Reports - The growth kinetics of the (001) and (110) faces of K2Co(SO4)2 · 6H2O and K2Ni(SO4)2 · 6H2O crystals in the kinetic mode has been in situ investigated for the... 相似文献
8.
Tereshchenko A. N. Zinenko V. I. Khodos I. I. Agafonov Yu. A. Zhokhov A. A. Masalov V. M. Steinman E. A. Emelchenko G. A. 《Physics of the Solid State》2012,54(3):586-592
The photoluminescence induced in diamond by helium ion implantation into SiC/C nanocomposite samples and their structure revealed
by high-resolution transmission electron microscopy have been investigated. It has been found that, apart from crystallites
of silicon carbide, graphite, and amorphous carbon, in the structure of the composites there are spherical carbon particles
containing concentric graphite-like shells (onion-like particles). It has been established that onion-like particles are formed
during high-temperature treatment of SiC/C nanocomposites in the course of their preparation. It has been shown that, after
the implantation with the subsequent thermal treatment, nanocomposite samples exhibit a luminescence characteristic of N-V centers in diamonds. The assumption has been made that the diamond crystallites are formed at the center of onion-like particles
during high-temperature treatment of the composite. 相似文献
9.
V.V. Ursaki V.V. Zalamai A. Burlacu J. Fallert C. Klingshirn H. Kalt G.A. Emelchenko A.N. Redkin A.N. Gruzintsev E.V. Rusu I.M. Tiginyanu 《Superlattices and Microstructures》2009,46(3):513-522
Quasi-two-dimensional arrays of nearly parallel hexagonal ZnO nanorods and a three-dimensional cylindrical microstructure consisting of ZnO nanorods have been grown by low pressure chemical vapor deposition (CVD) and carbothermal evaporation technologies, respectively. The technology ensures high optical quality of the produced nanostructures so as to act as a gain medium for stimulated emission in the ultraviolet spectral region in combination with high quality factor laser resonators. Multiple sharp lasing peaks were realized from the produced structures under nanosecond pulse optical excitation. The lasing peaks display successive onset and saturation with increasing excitation power density in accordance with the lasing behavior of guided modes in ZnO nanorods. The produced structures are expected to find applications in integrated nanoscale optoelectronics, photonics, and sensor technologies. 相似文献
10.
G.A. Emelchenko A.N. Gruzintsev V.T. Volkov V.M. Masalov A.V. Bazhenov D.A. Fokin 《Photonics and Nanostructures》2007,5(2-3):96-100
The fabrication of the 2D periodic structures in ZnO thin films by magnetron sputtering on the opal matrices was developed. The microstructures were characterized by AFM and SEM. The spontaneous and stimulated emissions of the ZnO layers on opal were studied at N2 laser excitation (λ = 337 nm). The stimulated emission near 397 nm was observed at room temperature from ZnO–opal structure. The threshold of the electron–hole plasma recombination laser process was 300 kW/cm2 for this structure. This threshold is two orders of magnitude smaller of that one for the flat ZnO–SiO2 films owing to DFB resonator effect in 2D structure. 相似文献