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1.
E. L. Belokoneva A. G. Ivanova S. Yu. Stefanovich O. V. Dimitrova V. S. Kurazhkovskaya 《Crystallography Reports》2004,49(4):603-613
Crystals of new rare earth borates of the composition Ln[B6O9 (OH)3] (Ln = Sm-Lu), sp. gr. R3c are synthesized under hydrothermal conditions. Their crystal structures are determined on single crystals with Ln = Ho, Gd without preliminary determination of their chemical formulas. The polar anionic framework of the crystals consists
of BO3 triangles and BO4 tetrahedra and has wide channels along the threefold axis of the structure, which are similar to the channels along the a, b, and c axes in cubic Li4[B7O12]Cl boracite with Li conductivity. Rare earth atoms are arranged in the structure over the cubic F pseudolattice, whereas
the analogous positions in Li boracites are filled with Cl anions. The squared optical nonlinearity of the new crystals is
comparable with the nonlinearity of quartz, whereas the electrical conductivity in borates at 300°C exceeds 10−6 S/cm.
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Translated from Kristallografiya, Vol. 49, No. 4, 2004, pp. 681–691.
Original Russian Text Copyright ? 2004 by Belokoneva, Ivanova, Stefanovich, Dimitrova, Kurazhkovskaya. 相似文献
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RADIATION-INDUCED CHANGES IN THE STRUCTURE AND FERROELECTRIC PROPERTIES OF Pb5Ge3O11 SINGLE CRYSTALS
Stash A. I. Ivanov S. A. Boiko V. M. Ermakov V. S. Stefanovich S. Yu. Mosunov A. V. 《Journal of Structural Chemistry》2021,62(12):1880-1895
Journal of Structural Chemistry - Perfect stoichiometric Pb5Ge3O11 single crystals are irradiated with 60Co γ-rays (1·106 Rad) and high-energy electrons (0.13 e/cm2, 0.89 e/cm2,... 相似文献
5.
M. A. Belyaev P. P. Boriskov A. A. Velichko A. L. Pergament V. V. Putrolainen D. V. Ryabokon’ G. B. Stefanovich V. I. Sysun S. D. Khanin 《Physics of the Solid State》2018,60(3):447-456
The results of the experimental studies and numerical simulation of the switching channel development dynamics in planar structures on the basis of vanadium dioxide are reported. The obtained data on the variation of the temperature in the channel with time and of the current arisen after the pulsed load, and on the times of transition from the high-resistance to the low-resistance state and back are analyzed in order to determine the switching mechanism and to predict the functional characteristics of the switchable vanadium- oxide structures as promising materials for the creation of relaxation generators that can serve as prototypes of neural oscillators. It is shown that the switching behavior is associated with the metal–semiconductor phase transition in vanadium dioxide, which is stimulated by the emission of Joule heat. 相似文献
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E. Yu. Borovikova D. A. Ksenofontov Yu. K. Kabalov V. S. Kurazhkovskaya S. Yu. Stefanovich I. V. Korchemkin E. A. Asabina 《Crystallography Reports》2012,57(4):514-520
A complex study of the synthetic CsMgPO4 phosphate with a ??-tridymite structure type is performed. It is found that CsMgPO4 is an unstable phase. At room temperature in air, it absorbs water and turns into the CsMgPO4 · 6H2O crystal hydrate. The transformation of cubic CsMgPO4 · 6H2O into orthorhombic CsMgPO4 proceeds upon heating to 150°C by the pattern of the first-order phase transition with the dehydration of the specimen. 相似文献
7.
I. A. Dantsker A. V. Teterskii A. A. Fursina S. N. Savvin S. Yu. Stefanovich N. Ya. Turova B. I. Lazoryak 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(8):1179-1182
Oxygen-ion-conductive apatite-like oxosilicate and silicophosphate ceramics has been prepared by sintering sol-gel synthesis products at temperatures 200°C below those of solid-phase synthesis. The electrical properties of the ceramics obtained have been studied by impedance spectroscopy in the range 400–1000°C. A positive effect of heterovalent substitutions in the silicon sublattice on the bulk and intergrain conductivities is established. The increase in the oxygen-ion conductivity in La9.6Si5.7Mg0.3O26.1 in comparison with the other studied oxosilicates by more than two orders of magnitude is related to the formation of additional interstitial positions for oxygen ions as a result of partial substitution of the silicon ion, tetrahedrally coordinated by oxygen, with the Mg ion having a characteristic octahedral coordinatio 相似文献
8.
AA Yan LI Kai CAO ZhongHua & HU WenRui Key Laboratory of Microgravity 《中国科学:物理学 力学 天文学(英文版)》2011,(2)
The dependency of the critical Marangoni number on the geometrical aspect ratio of the floating half zone is essential to predict the onset of oscillatory thermocapillary convection.The experimental studies in the microgravity conditions on floating half zones of several centimeters in diameter have predicted that the critical Marangoni number increases with the increasing aspect ratio,and the terrestrial experimental studies have predicted the contradictory conclusion for floating half zones of several mil... 相似文献
9.
Non-Gravitational Effects with Density-Matching in Evaluating the Influence of Sedimentation on Colloidal Coagulation
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The method of density matching between the solid and liquid phases is often adopted to effectively eliminate the effect of sedimentation of suspensions in studies on dynamic behaviour of a colloidal system. However, the associated changes in the solvent composition may bring side effects to the properties investigated and therefore might lead to a faulty conclusion if the relevant correction is not made. To illustrate the importance of this side effect, we present an example of the sedimentation influence on the coagulation rate of suspensions of 2μm (diameter) polystyrene. The liquid mixtures, in the proper proportions of water (H2O), deuterium oxide (D2O) and methanol (MeOH) as the liquid phase, density-matched and unmatched experiments are performed. Besides the influence of viscosity, the presence of methanol in solvent media, used to enhance the sedimentation effect, causes significant changes (reduction) in rapid coagulation rates compared to that in pure water. Without the relevant corrections for those non-gravitational factors it seems that gravitational sedimentation would retard the coagulation. The magnitude of the contribution from the non-gravitational factor is quantitatively determined, making the relevant correction possible. After necessary the influence of the sedimentation on coagulation rates at corrections for all factors, our experiments show that the initial stage of the coagulation is not observable. 相似文献
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