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11.
Rotermel Maria V. Samigullina Rina F. Ivanova Irina V. Vladimirova Elena V. Baklanova Inna V. Krasnenko Tatiana I. 《Journal of Sol-Gel Science and Technology》2021,100(3):404-413
Journal of Sol-Gel Science and Technology - The Zn1.9Cu0.1SiO4 pigment was obtained by two variants of “soft” chemistry methods: using sol–gel synthesis in ethanol from TEOS and... 相似文献
12.
T. I. Krasnenko M. V. Rotermel R. F. Samigullina 《Russian Journal of Inorganic Chemistry》2017,62(4):413-417
The previously unknown effect of emergence of an associated non-autonomous phase upon heating of zinc pyrovanadate Zn2V2O7 within the region of negative volume expansion is detected. Comparison of the data of high-temperature X-ray diffraction of the Zn2V2O7 samples synthesized via solution and solid-phase routes shows that the grain size affects the stabilization of the non-autonomous phase. The presence of a non-autonomous phase results in self-dispersion of the substance upon phase transition in heating–cooling cycles. 相似文献
13.
M. V. Rotermel A. Yu. Suntsov T. I. Krasnenko R. F. Samigullina E. D. Pletneva 《Bulletin of the Russian Academy of Sciences: Physics》2016,80(6):668-671
Studies on the sintering of manganese pyrovanadate depending on the temperature and the crystallite size show that we are prevented from obtaining a bulk ceramic sample by the anisotropic growth of grains. Investigation of the electrical properties of Mn2V2O7 in the temperature range of 250–800°C reveals the activation energy at which bulk conductivity is 0.62 eV. 相似文献
14.
T. I. Krasnenko T. P. Sirina M. V. Rotermel’ 《Russian Journal of Inorganic Chemistry》2008,53(9):1489-1494
Phase composition of the V2O5-NaVO3-Ca(VO3)2-Mn2V2O7 system was studied, and a subsolidus phase diagram constructed. The tetrahedration of the diagram is determined by the fact that the end-member of Ca1–x Mn x (VO3)2 solid solution is in equilibrium with all compounds of the system (V2O5, NaVO3, Ca(VO3)2), vanadium β-bronzes Na x V2O5 (0.22 ≤ x ≤ 0.40) and κ-bronzes (0.25 ≤ x ≤ 0.45, 0 ≤ y ≤ 0.16), Mn2V2O7, and Na2Mn3(V2O7)2 and with the end-members of reciprocal solid solutions based on calcium and sodium metavanadates. At 20°C, the degree of vanadium dissolution α for Na2Ca(VO3)4 is 100% for 0.5 ≤ pH ≤ 10; for the other phases of the system, vanadium dissolution ranges from 100 to 10% for pH below 3.5; in the alkaline pH range, ≤ 10%. Sodium for calcium substitution in Ca(VO3)2 increases α in aqueous NaOH to 20%. For Na2Mn3(V2O7)2, α decreases from 92 to 80% as pH changes from 0.5 to 2.5; at pH above 4, α = 30%. 相似文献
15.
A survey of the literature data on the adsorption of benzene on graphene or carbon nanotubes indicates that the distance between the graphene sheet and benzene molecule is determined from weak van der Waals forces (∼3.40 Å). In our theoretical study, it was found that the benzene/graphene structure (in a specific configuration with carbon atoms located at the atop positions, stacked directly on the top of each other) forms strong covalent bonds, if the distance between the graphene and benzene is about 1.60 Å. Such a short distance corresponds to about a half of the usual separation between the graphite layers. It was also shown that at such a short distance the carbon atoms of the benzene molecule move towards the graphene sheet, whereas the hydrogen atoms move in a different direction, thus breaking the benzene planar structure. 相似文献
16.
T. I. Chupakhina T. I. Krasnenko O. I. Gyrdasova G. V. Bazuev 《Bulletin of the Russian Academy of Sciences: Physics》2012,76(7):754-756
Fine-grained single phase La2 ? x Sr x NiO4 + ?? powders are produced by means of self-propagating high temperature synthesis (SHS) after annealing the primary product at 670°C. Ammonium citrate was used as the reduction agent. It is shown that the reduction in unit cell volume due to lanthanum being replaced by larger strontium ions is caused by an increase in nickel oxidation. 相似文献
17.
Thermally activated structural change of Mn2V2O7 has been studied at ?180 to 1000°C. The patterns of the solid solutions based on magnesium pyrovanadate stability upon isovalence substitution have been induced. 相似文献
18.
T. I. Krasnenko N. A. Zhuravlev L. A. Perelyaeva 《Bulletin of the Russian Academy of Sciences: Physics》2012,76(3):371-373
The local structure of pyroanion groups in the incommensurate phase X-Zn2 − 2x
Cd2x
V2O7 (0.11 ≤ x ≤ 0.48) with a zero volumetric expansion coefficient is studied. Comparative analysis of IR and NMR spectra of samples in
the X-phase and of ZnCdV2O7 revealed that vanadium atoms have a similar structural and an identical charge environment. Additional bands in the IR spectra
of the X-phase in the range of end vibrations are due to the influence of the cation sublattice. 相似文献
19.
V. V. Belov Yu. B. Burkatovskaya N. P. Krasnenko M. V. Tarasenkov L. G. Shamanaeva 《Russian Physics Journal》2012,54(11):1286-1294
The Monte–Carlo method is used to solve the problem of sound propagation through the lower plane-stratified 500-meter layer
of the moving turbulent atmosphere. Quantitative estimates of the intensity of transmitted and multiply scattered radiation
are obtained with allowance for the influence of the refraction effects. 相似文献
20.
Onufrieva T. A. Krasnenko T. I. Zaitseva N. A. Baklanova I. V. Rotermel’ M. V. Ivanova I. V. Popov I. D. Samigullina R. F. 《Physics of the Solid State》2019,61(5):806-810
Physics of the Solid State - The analysis of the unified series of single-phase Zn2 – 2xMn2xSiO4 samples (x ≤ 0.2) has provided the possibility to determine the... 相似文献