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Общее количество найденных документов : 135
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1.
Инвентарный номер: нет.
   
   S 89


   
    Structural transformations in a Bi2O3 crystal and in Bi2O3-based solid solutions in the temperature interval 25–750 C / L. V. Ermakova, V. N. Strekalovskii, E. G. Vovkotrub, V. G. Bamburov // Journal of Applied Spectroscopy. - 2002. - Vol. 69, № 1. - P152-154 : il. - Bibliogr. : p. 154 (6 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД ВИСМУТА -- РАМАНОВСКАЯ СПЕКТРОСКОПИЯ -- ФАЗОВЫЙ ПЕРЕХОД
Аннотация: The Raman scattering spectra of isostructural Bi2O3 and Bi1.8Tm0.2O3 in the course of heating have been investigated. It is shown that the sequences of structural changes with increase in temperature differ: α → δ and δ* → β → δ, respectively. In the high-temperature region, the structure takes the form of a disordered cube irrespective of the previous history of specimens

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2.
Инвентарный номер: нет.
   
   R 42


    Rempel, A. A.
    Identification of Structural Vacancies in Carbides, Oxides, and Sulfides by Doppler Broadening of the Gamma-Ray Line / A. A. Rempel, A. A. Valeeva, N. S. Kozhevnikova // JETP Letters. - 2010. - Vol. 92, № 3. - P146-150 : il. - Bibliogr. : p. 150 (9 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СТРУКТУРНЫЕ ВАКАНСИИ -- КАРБИДЫ -- ОКСИДЫ -- СУЛЬФИДЫ
Аннотация: A method has been developed to identify the sublattices of a crystal structure in which there are atomic vacancies. This method is based on determining the chemical environment of vacancies and is implemented using the method of the positron annihilation by measuring the momentum distribution of core electrons. To determine the characteristic momentum distribution of electrons, a special two-detector spectroscopy is used, which ensures measurements of Doppler broadening of the annihilation gamma ray line with a high (up to 106) signal-to-noise ratio. To test the method, vacancies in irradiated silicon carbide (6H SiC), sintered nonstoichiometric titanium carbides (TiCy) and titanium monoxides (TiOy), and chemically deposited lead and cadmium sulfides (PbS and CdS) have been identified. Vacancies in the carbon and silicon sublattices have been identified in silicon carbide after irradiation by low- and high-energy electrons, respectively. Vacancies in the nonmetal sublattice have been identified in TiCy. Vacancies in the metal sublattice have been identifiedin TiCy, as well as in PbS and CdS

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3.
Инвентарный номер: нет.
   
   V 18


   
    Valence state of cobalt atoms and crystal structure of YBa2Cu3-xCoxO6+delta solid solution / V. I. Voronin, B. N. Goshchitskii, E. B. Mitberg, I. A. Leonidov, V. L. Kozhevnikov // Journal of Structural Chemistry. - 2000. - Vol. 41, № 4. - P626-631 : il. - Bibliogr. : p. 631 (19 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КОБАЛЬТ -- ТВЕРДЫЕ РАСТВОРЫ -- ИТТРИЙ-БАРИЕВЫЙ КУПРАТ
Аннотация: The crystal structure of YBa2Cu3-xCox06+delta solid solutions, where x = 0.2, 0.4, 0.6, and 0.8, was studied by powder neutron diffraction. The charged states of the cations were calculated using the interatomic distances obtained in neutron diffraction measurements. It is shown that cobalt in the Cul position has valence 3+ and octahedral environment for x = 0.2 and 0.4. As x increases, the valence of some cobalt ions in the above positions changes to 4+, the environment changes to tetrahedral, and copper in the Cu2 position is partly substituted. Cobalt in the Cu2 positions has valence 2+ and does not change the square pyramidal arrangement of oxygen ions surrounding this position

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4.
Инвентарный номер: нет.
   
   E 43


   
    Electronic structure and chemical bonding in yttrium dicarbide and strontium dicarbide / V. P. Zhukov, D. L. Novikov, N. I. Medvedeva, V. A. Gubanov // Journal of Structural Chemistry. - 1989. - Vol. 30, № 4. - P553-559 : il. - Bibliogr. : p. 558-559 (11 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ДИКАРБИД ИТТРИЯ -- ДИКАРБИД СТРОНЦИЯ -- МЕТОД ДИСКРЕТНОГО ВАРЬИРОВАНИЯ
Аннотация: The energy band structure of yttrium dicarbide and strontium dicarbide has been investigated by the nonempirical LMTO band method and the Xalfa-discrete-variation cluster method. Calculations have been performed by the Xalfa-DV method for cluster models with the formulas (Y6C2) 10+ and (Sr6C2)10+ and contour maps of the molecular orbitals of the clusters have been constructed. The results of the calculations have been used to analyze the chemical bonding and some physicochemical properties. It has been shown that the bonding between the C2(2-) grouping and the neighboring yttrium and strontium atoms is effected mainly by a 4dY, 2pC group orbital, which appears in the composition of the band of the metallic states. An expansion for the instability of the crystal structure of SrC 2 has been given

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5.
Инвентарный номер: нет.
   
   N 52


   
    New Superconductor with a Layered Crystal Structure: Nickel Oxybismuthide LaO1-deltaNiBi / V. L. Kozhevnikov, O. N. Leonidova, A. L. Ivanovskii, I. R. Shein, B. N. Goshchitskii, A. E. Kar'kin // JETP Letters. - 2008. - Vol. 87, № 11. - P649-651 : il. - Bibliogr. : p. 651 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИВИСМУТИД НИКЕЛЯ -- ОКСИВИСМУТИДЫ МЕТАЛЛОВ -- СВЕРХПРОВОДНИКИ
Аннотация: The results of synthesizing a new layered phase—nickel oxybismuthide LaO 1 –δNiBi in a series of superconducting oxypnictides—and its properties in the superconducting and normal states are reported. Although the temperature of the transition of this phase to the superconducting state, Tc~ 4 K, is much lower than the value Tc= 55 K reached at present in oxyarsenide SmO1 –δ FeAs, the similarity of the crystal structures and ρ(T) dependencies indicates that the mechanism responsible for the appearance of the semiconducting state is the same in lanthane oxybismuthide and samarium oxyarsenide

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6.
Инвентарный номер: нет.
   
   C 91


   
    Crystal structure, morphotropic phase transition and luminescence in the new cyclosilicates Sr3R2(Si3O9)2, R=Y, Eu–Lu / A. P. Tyutyunnik, I. A. Leonidov, L. L. Surat, I. F. Berger, V. G. Zubkov // Journal of Solid State Chemistry. - 2013. - Vol. 197. - P447-455 : il. - Bibliogr. : p. 454-455 (71 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
РЕНТГЕНОВСКАЯ ДИФРАКЦИЯ -- СИЛИКАТЫ -- ЛЮМИНЕСЦЕНЦИЯ
Аннотация: A new series of promising luminescent materials, cyclosilicates Sr3R2(Si3O9)2, R=Y, Eu–Lu, has been synthesized via a solid-state reaction. X-ray and neutron powder diffraction studies show that these oxides crystallize in the monoclinic crystal system (S.G. C2/c, Z=4) and have a morphotropic phase transition between Er and Tm compounds followed by a step-like change of the unit cell constants. Isolated [Si3O9] rings located in layers are basic building units and stack with Sr/R layers along the [1 0 ] direction. The rare earth atoms are distributed among three independent Sr/R sites coordinated by 8, 7 and 6 oxygen atoms, and the Sr-R populations change from mixed to 0.5/0.5 over site (1) and full occupation of sites (2) and (3) by Sr and R, respectively, at the transition. Changes of the conformation and mutual arrangement of [Si3O9] rings, as well as exchange of oxygen atoms from the first and the second coordination sphere of two Sr/R sites also feature the phase transition. Luminescence in Sr3Y2(Si3O9)2:Eu3+ under ultraviolet (UV) excitation has been discussed

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7.
Инвентарный номер: нет.
   
   I-61


   
    Inhomogeneous State of the Electron System in BaPb1 – xSbxO3 Superconducting Perovskites: The 207Pb NMR Study / A. F. Sadykov, Yu. V. Piskunov, V. V. Ogloblichev, I. Yu. Arapova, A. P. Gerashchenko, A. L. Buzlukov, S. V. Verkhovskii, I. A. Leonidov // JETP Letters. - 2010. - Vol. 91, № 5. - P245-250 : il. - Bibliogr. : p. 249-250 (31 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПЕРОВСКИТЫ -- СВИНЕЦ -- СВЕРХПРОВОДИМОСТЬ
Аннотация: Comprehensive measurements of the 207Pb NMR spectra, Knight shifts 207Ks, spin–lattice relaxation rate, and the Pb spin echo decay 207E(2t) in BaPb1 – xSbxO3 superconducting oxides (x ≤ 0.33) have been performed. A considerable increase in the shift distribution width when Sb is substituted for Pb indicates the formation of the inhomogeneous state of the electron system in the oxide conduction band. The shift magnitude proportional to the density of states near the Fermi energy, 207Ks ∝ N(EF), reaches its maximum in the compounds with x = 0.18–0.25 with the maximum temperatures Tc of the superconducting transition. In the BaPb1 – xSbxO3 compounds, the Korringa relation is met, indicating that all of the samples are in the metal phase. The data on the Pb spin echo decay and the relevant estimates of the indirect coupling constants of the nuclei of the nearest neighbor Pb atoms clearly demonstrate the development of the electron system state in the oxide metal phase, which is microscopically inhomogeneous over the crystal

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8.
Инвентарный номер: нет.
   
   S 12


    Sadovnikov, S. I.
    New Crystalline Phase in Thin Lead Sulfide Films / S. I. Sadovnikov, A. I. Gusev, A. A. Rempel // JETP Letters. - 2009. - Vol. 89, № 5. - P238-243 : il. - Bibliogr. : p. 243 (23 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КРИСТАЛЛИЧЕСКАЯ СТРУКТУРА -- ТОНКИЕ ПЛЕНКИ -- СУЛЬФИД СВИНЦА
Аннотация: The crystal structure of thin lead sulfide (PbS) films fabricated by hydrochemical deposition is studied by X ray diffraction analysis. It is established that both the synthesized PbS films and the same films annealed in the temperature interval of 293–423 K have a cubic (space group Fm m) crystal structure different from the B1 type structure. In this structure, sulfur (S) atoms are located not only in positions 4(b) (octahedral interstices of the face centered sublattice of lead (Pb) atoms) but also in positions 8(c), i.e., in tetrahedral interstices. The occupations of positions 4(b) and 8(c) by S atoms are ~0.84 and ~0.08, respectively. Long range order in the location of S atoms in positions of each type is absent, but correlations may be present. The new revealed structure of PbS films remains stable under a prolonged annealing in the temperature interval from 293 to 423 K

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9.
Инвентарный номер: нет.
   
   T 44


   
    The product of thermobaric treatment of Pt0.25Os0.75 / S. A. Gromilov, T. V. D’yachkova, A. P. Tyutyunnik, Yu. G. Zainulin, V. A. Gubanov, S. V. Cherepanova // Journal of Structural Chemistry. - 2008. - Vol. 49, № 2. - P382-385 : il. - Bibliogr. : p. 385 (9 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПЛАТИНА -- ОСМИЙ -- ТВЕРДЫЕ РАСТВОРЫ -- КРИСТАЛЛОХИМИЧЕСКИЙ АНАЛИЗ
Аннотация: The products obtained from the Pt0.25Os0.75 nonequilibrium solid solution treated by the thermobaric procedure (1.5-2 GPa, 2000C, 3 min) were investigated by X-ray powder diffraction. The phase compositions were evaluated from quantitative X-ray phase analysis, energy dispersion spectroscopy, and crystal-chemical analysis data for known Pt0.25Os0.75 phases

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10.
Инвентарный номер: нет.
   
   E 58


    Ryzhkov, M. V.
    Role of relativistic effects in the electronic structure and chemical bond of lead hexacyanoferrate / A. N. Enyashin // Journal of Structural Chemistry. - 2007. - Vol. 48, № 1. - P173-176 : il. - Bibliogr. : p. 176 (6 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КЛАСТЕРНЫЕ РАСЧЕТЫ -- РЕЛЯТИВИСТСКИЕ ЭФФЕКТЫ -- ГЕКСАЦИАНОФЕРРАТ СВИНЦА
Аннотация: The electronic structure of a large fragment of the Pb2Fe(CN)6 crystal lattice with the trigonal structure is studied in the framework of a fully relativistic discrete variational cluster method. On the basis of comparing the results obtained with the data of previous non-relativistic calculations we have considered the relativistic effects on the electronic energy spectrum, the charge density distribution, and Pb–N, N–C, and C–Fe chemical bonding

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