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O. A. Alekseeva A. M. Antipin A. Gagor A. Pietraszko N. E. Novikova N. I. Sorokina E. P. Kharitonova V. I. Voronkova 《Crystallography Reports》2013,58(6):829-834
A high-precision X-ray diffraction study of single crystals of two compositions—La2Mo1.78V0.22O8.89 and La2Mo1.64V0.36O8.82—was performed. In the vanadium-doped compounds, as in the structure of the metastable βms phase of pure La2Mo2O9, the La and Mo atoms and one of the three oxygen atoms are displaced from the threefold axis, on which they are located in the high-temperature β phase. The structure contains two partially occupied oxygen sites. It was shown that molybdenum atoms are partially replaced by vanadium atoms, which are not involved in the disordering, are located on the threefold axis, and are shifted toward one of the oxygen atoms. This is consistent with the temperature-induced changes in the structure of La2Mo2O9 and the changes in the properties of these crystals caused by the introduction of vanadium atoms into the structure. 相似文献
105.
V. I. Antipin 《Siberian Mathematical Journal》2013,54(2):185-195
We study boundary value problems for operator-differential equations of mixed type, prove existence of generalized solutions, and establish their smoothness in weighted Sobolev spaces. The results are applied to odd order forward-backward equations. 相似文献
106.
Haag’s theorem was extended to the general case of noncommutative quantum field theory when time does not commute with spatial variables. It was proven that if S matrix is equal to unity in one of two theories related by unitary transformation, then the corresponding one in the other theory is equal to unity as well. In fact, this result is valid in any SO(1, 1)-invariant quantum field theory, an important example of which is noncommutative quantum field theory. 相似文献
107.
Valiyakhmetova A. M. Sultanova E. D. Burilov V. A. Solovieva S. E. Antipin I. S. 《Russian Chemical Bulletin》2019,68(5):1067-1074
Russian Chemical Bulletin - New p-tert-butyl thiacalix[4]arene derivative in the 1,3-alternate stereoisomeric form containing two diethylenetriamine groups and pentacosa-10,12-diynoic moieties on... 相似文献
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I. I. Vorontsov K. A. Potekhin M. Yu. Antipin I. E. Zanin 《Crystallography Reports》2000,45(2):234-243
The reversible structural phase transition accompanied by the doubling of the unit cell parameter c and a change in the space group is found in the decamethylosmocene crystal Cp 2 * at a temperature of 243 ± 5 K. In the high-temperature (HT) phase (space group P21/m, Z = 2), the molecule adopts an eclipsed conformation and lies in the mirror symmetry plane. In the low-temperature (LT) phase (space group P21/c, Z = 4), the molecule occupies the general position with a small rotation of the ligands. The structural transformations from the high-temperature phase into the low-temperature phase at 120 K are described by the deviation of the molecular axis of fivefold symmetry by 3.2(2)° and the displacement of the center of mass of the molecule by 0.173(2) Å with respect to their positions in the high-temperature phase, and also by the rotation of the Cp* ligands in the same direction by 3.0(2)° and 5.4(2)°, respectively. 相似文献
110.
Kuleshova L. N. Averkiev B. B. Gusev D. V. Suponitskii K. Yu. Antipin M. Yu. 《Crystallography Reports》2004,49(5):798-806
Crystallography Reports - The molecular and crystal structures of three concomitant polymorphic modifications of N-(4-butoxyphenyl)-4-(4′-nitrophenyl)-2-thiazolamine are investigated by X-ray... 相似文献