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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Cannon E. H., Campbell D. K., Kusmartsev F. V., Alekseev K. N.
Заглавие : Multistability, absolute negative conductivity and spontaneous current generation in semiconductor superlattices in large magnetic fields
Коллективы : International Workshop on Surgaces and Interfaces in Mesoscopic Devices
Место публикации : Superlattices Microstruct./ International Workshop on Surgaces and Interfaces in Mesoscopic Devices (3 ; 1999 ; Dec. ; 6-10 ; Maui, Hawaii). - 2000. - Vol. 27, Is. 5-6. - P.495-498. - ISSN 0749-6036, DOI 10.1006/spmi.2000.0866
Примечания : Cited References: 7
Предметные рубрики: TRANSPORT
Ключевые слова (''Своб.индексиров.''): superlattice--miniband transport--nonlinear transport--current voltage characteristics--electric conductivity--electron transport properties--magnetic field effects--mathematical models--multistable circuits--balance equation models--hot electrons--miniband transport--semiconductor superlattices
Аннотация: We discuss electron transport through a semiconductor superlattice subject to an electric field parallel to, and a magnetic field perpendicular to, the growth axis using a semiclassical balance equation model. We find that the current-voltage characteristic becomes multistable in a large magnetic field; furthermore, hot electrons display novel features in their current-voltage characteristic, including absolute negative conductivity and a spontaneously generated de current at zero bias. (C) 2000 Academic Press.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Lesnikov M. K.
Заглавие : Crystal Structure and Properties of Levofloxacinium 2-Thiobarbiturate Trihydrate
Коллективы : Ministry of Education and Science of the Russian Federation [4.7666.2017/BCh]
Место публикации : J. Struct. Chem. - 2018. - Vol. 59, Is. 3. - P.646-651. - ISSN 0022-4766, DOI 10.1134/S0022476618030204. - ISSN 1573-8779(eISSN)
Примечания : Cited References: 20. - The work was performed within the State Task of the Ministry of Education and Science of the Russian Federation to the Siberian Federal University for 2017-2019 (4.7666.2017/BCh).
Предметные рубрики: CIPROFLOXACIN
MONOHYDRATE
QUINOLONE
ACID
Ключевые слова (''Своб.индексиров.''): levofloxacin--2-thiobarbituric acid--salt--crystal structure--absolute--structure--thermal stability--ir spectrum
Аннотация: The structure of levofloxacinium 2-thiobarbiturate trihydrate LevoH 2 + Htba–·3H2O (I) (LevoH is levofloxacin, H2tba is 2-thiobarbituric acid) is determined (CIF file CCDC No. 1547466); its thermal decomposition and IR spectrum are studied. The crystals of I are triclinic: a = 8.670(1) Å, b = 9.605(1) Å, c = 15.786(2) Å, α = 89.144(5)°, β = 88.279(5)°, γ = 76.068(5)°, V = 1275.4(3) Å3, space group P1, Z = 2. The unit cell of I contains two LevoH 2 + ions, two Htba– ions, and six H2O molecules. The absolute structure of the crystal and the configuration of the chiral center in a levofloxacin molecule S are determined. Experiments for generating the second optical harmonics gave a positive result. Intermolecular hydrogen bonds (HBs) N–H···O and O–H···O in I form a bilayer system along the ab diagonal with hydrophilic moieties within a layer and hydrophobic moieties directed outward. The structure is stabilized by multiple HBs and the π–π interaction between the Htba–and LevoH 2 + ions and between the LevoH 2 + ions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smirnova E. S., Alekseeva O. A., Dudka A. P., Sorokin T. A., Khmelenin D. N., Yapaskurt V. O., Lyubutina M. V., Frolov K. V., Lyubutin I. S., Gudim I. A.
Заглавие : Crystal structure, absolute configuration and characteristic temperatures of SmFe3(BO3)4 in the temperature range 11-400 K
Место публикации : Acta Crystallogr. B. - 2022. - Vol. 78, Is. 3-2, Pt. 1. - P.546-556. - ISSN 20525206 (ISSN), DOI 10.1107/S2052520622003948
Примечания : Cited References: 43. - The authors are grateful to D. Yu. Chernyshov (SNBL, ESRF, Grenoble) for assistance in obtaining the experimental data. This work was performed using the equipment of the Shared Research Center FSRC ‘Crystallography and Photonics’ RAS supported by the Russian Ministry of Science and Higher Education. This work was supported by the Ministry of Science and Higher Education within the State assignment FSRC ‘Crystallography and Photonics’ RAS
Аннотация: The crystal structure of samarium iron borate was analyzed with regard to growth conditions and temperature. The inclusion of about 7% Bi atoms in the crystals grown using the Bi2Mo3O12-based flux was discovered and there were no impurities in the crystals grown using the Li2WO4-based flux. No pronounced structural features associated with Bi inclusion were observed. The different absolute configurations of the samples grown using both fluxes were demonstrated. Below 80 K, a negative thermal expansion of the c unit-cell parameter was found. The structure of (Sm0.93Bi0.07)Fe3(BO3)4 belongs to the trigonal space group R32 in the temperature range 90–400 K. A decrease in the (Sm,Bi)—O, Sm—B, Sm—Fe, Fe—O, Fe—B and Fe—Fe distances is observed with a lowering of the temperature, B1—O does not change, B2—O increases slightly and the B2O3 triangles deviate from the ab plane. The strongest decrease in the equivalent isotropic atomic displacement parameters (Ueq) with decreasing temperature is observed for atoms Sm and O2, and the weakest is observed for B1. The O2 atoms have the highest Ueq values, the most elongated atomic displacement ellipsoids of all the atoms and the smallest number of allowed vibrational modes of all the O atoms. The largest number of allowed vibrational modes and the strongest interactions with neighbouring atoms is seen for the B atoms, and the opposite is seen for the Sm atoms. The quadrupole splitting Δ(T) of the paramagnetic Mössbauer spectra increases linearly with cooling. The Néel temperature [TN = 31.93 (5) K] was determined from the temperature dependence of the hyperfine magnetic field Bhf(T), which has a non-Brillouin character. The easy-plane long-range magnetic ordering below TN was confirmed.
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