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1.
Инвентарный номер: нет.
   
   O-97


   
    Oxygen Thermodynamics and Ion Conductivity in the Solid Solution La .xSrxCoO3-delta at Large Strontium Content / M. V. Patrakeev, I. A. Leonidov, E. B. Mitberg, A. A. Lakhtin, V. G. Vasiliev, V. L. Kozhevnikov, K. R. Poeppelmeier // Ionics. - 1999. - Vol. 5, № 5-6. - P. 444-449 : il. - Bibliogr. : p. 448-449 (32 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ТЕРМОДИНАМИКА -- ИОННАЯ ПРОВОДИМОСТЬ -- РАСТВОРЫ ТВЕРДЫЕ -- СТРОНЦИЙ -- ЛАНТАН -- КОБАЛЬТ
Аннотация: The equilibrium oxygen content was measured in the model system and important oxygen permeable material Lal.xSrxCoO3-delta, where x = 0.6, in the temperature range 650-900 ~ and oxygen partial pressure range between 10 .5 and 1 atm. The data were utilized to obtain changes in the partial entropy and enthalpy of oxygen in the solid as a function of the oxygen content. It is shown that the initially cubic perovskite undergoes to a phase transition to a tetragonal structure at delta > 0.3. The oxygen permeation of L0.4Sr0.6CoO3-delta at 700-900 C is found to be controlled by bulk solid state processes. The activation energy equals about 0.8 eV at high oxygen pressure and small oxygen nonstoichiometry. Increasing oxygen deficiency results in a rapid increase in the activation energy. In combination with thermodynamic data, these changes can be explained as resulting from the intrinsic, spatial inhomogeneouty in oxygen vacancy distribution which varies both with temperature and oxygen nonstoichiometry. It is shown that, when the oxygen deficiency increases at constant temperature, the oxygen vacancies form locally ordered microdomains (clusters), which eventually results in a transition of the cubic perovskite structure to the tetragonal structure. The oxygen ion conductivity depends strongly on the development of the ordering

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2.
Инвентарный номер: нет.
   
   V 18


    Valeeva, A. A.
    Electrical Conductivity and Magnetic Susceptibility of Titanium Monoxide / A. A. Valeeva, A. A. Rempel, A. I. Gusev // JETP Letters. - 2001. - Vol. 73, № 11. - P. 621-625 : il. - Bibliogr. : p. 625 (24 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СВЕРХПРОВОДИМОСТЬ -- СВОЙСТВА МАГНИТНЫЕ -- МОНООКСИД ТИТАНА
Аннотация: Conductivity and magnetic susceptibility of disordered cubic titanium monoxide TiOy (0.920<= y <= 1.262) are studied. Temperature dependences of the conductivity of TiOy monoxides with y <= 1.069 are described by the Bloch–Grüneisen function with Debye temperature 400–480 K, and temperature dependences of the susceptibility include Pauli paramagnetism of conduction electrons. The behavior of conductivity and susceptibility of TiOy with y>= 1.087 is typical of semiconductors with nondegenerate charge carriers obeying Boltzmann statistics. The band gap DeltaE between the valence and conduction bands of TiOy (y>= 1.087) is 0.06–0.17 eV, and effective mass of charge carriers is equal to 7–14 electron masses

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3.
Инвентарный номер: нет.
   
   S 89


   
    Structural features and enhanced high-temperature oxygen ion transport in SrFe1-xTaxO3-delta / A. A. Markov, E. V. Shalaeva, A. P. Tyutyunnik, V. V. Kuchin, M. V. Patrakeev, I. A. Leonidov, V. L. Kozhevnikov // Journal of Solid State Chemistry. - 2013. - Vol. 197. - P191-197 : il. - Bibliogr. : p. 197 (31 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФЕРРИТ СТРОНЦИЯ -- ИОННЫЙ ПЕРЕНОС -- ПЕРОВСКИТЫ ДВОЙНЫЕ -- КИСЛОРОДНАЯ НЕСТЕХИОМЕТРИЯ
Аннотация: Structural features, oxygen non-stoichiometry and transport properties are studied in the oxide series SrFe1−xTaxO3−δ, where x=0.2, 0.3 and 0.4. X-ray diffraction and electron microscopy data evidence formation of the inhomogeneous materials at x=0.3 and 0.4, which include phase constituents with a cubic perovskite and a double perovskite structure types. The composition, the amount and the typical grain size of the phase inhomogeneities are shown to depend both on doping and oxygen content. The increased oxygen-ion conductivity is observed in oxygen depleted materials, which is explained by the increase in the amount of cubic perovskite-like phase and development of interfacial pathways favorable for enhanced oxygen ion transport

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4.
Инвентарный номер: нет.
   
   T 44


   
    Thermodynamics of the Movable Oxygen and Conducting Properties of the Solid Solution YBa2Cu3.xCOxO6+delta at High Temperatures / M. V. Patrakeev, E. B. Mitberg, A. A. Lakhtin, I. A. Leonidov, V. L. Kozhevnikov, K. R. Poeppelmeier // Ionics. - 1998. - Vol. 4, № 3-4. - P. 191-199 : il. - Bibliogr. : p. 199 (24 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ИТТРИЙ-БАРИЕВЫЕ КУПРАТЫ -- ДОПИРОВАНИЕ -- КОБАЛЬТ -- ТЕРМОДИНАМИКА -- РАСТВОРЫ ТВЕРДЫЕ
Аннотация: High precision coulometric measurements of the equilibrium oxygen content in the solid solution YBa2Cu3_xCOxO6+delta, where x = 0, 0.2, 0.4, 0.6 and 0.8, were carded out using a double-cell technique in the temperature range 600 - 850 ~ and at oxygen pressure varying between 10 .5 and 1 atm. The data were employed to determine the partial molar enthalpy and entropy of the movable oxygen depending on 8 and x. The electrical conductivity and thermopower were also measured in the same range of the external parameters, and their dependence on the oxygen concentration was determined at different cobalt content. The data reveal several types of oxygen sites participating in the gas-solid equilibrium. The behavior of thermodynamic functions is indicative of the partial ordering of the complex species which form the structural layer Cu1-xCoxOdelta with variable content of oxygen and cobalt. It was shown that replacement of copper by cobalt does not result in appearance of the electronic charge carriers. The behavior of the thermopower and electric conductivity was explained with a narrow band model. The energy change with 8 and x of the p-band, which dominates the conductivity, was found to follow the respective change in the oxygen partial enthalpy. Thus, electronic carriers in the layered structure of the cuprate are strongly influenced by the labile oxygen ions

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5.
Инвентарный номер: нет.
   
   E 58


    Enyashin, A. N.
    Structural Defects and Electronic Properties of TiS2 Nanotubes / A. N. Enyashin, A. L. Ivanovskii // Inorganic Materials. - 2005. - Vol. 41, № 10. - P. 1266-1271 : il. - Bibliogr. : p. 1122-1123 (21 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ДЕФЕКТЫ СТРУКТУРНЫЕ -- СВОЙСТВА ЭЛЕКТРОННЫЕ -- СУЛЬФИД ТИТАНА -- НАНОТРУБКИ
Аннотация: Structural models are described for three groups of structural defects in TiS2 nanotubes: those which influence the stoichiometry of nanotubes, the local atomic configuration of their walls, and their local morphology (convex or concave walls). Tight-binding band-structure calculations are used to evaluate the energy and electronic properties of “ideal” and imperfect TiS2 nanotubes. The results suggest that the energetically favored defects are those which increase the inner volume of the tubes. In contrast to ideal TiS2 nanotubes, which are all semiconductors, the tubes containing any of the structural defects considered here have metal-like conductivity

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6.
Инвентарный номер: нет.
   
   E 70


    Ermakova, L. V.
    Electrical Conductivity of Bi2O3-Tm2O3-Nb2O5 Solid Solutions / L. V. Ermakova, V. G. Bamburov // Inorganic Materials. - 2007. - Vol. 43, № 7. - P. 747-750 : il. - Bibliogr. : p. 750 (6 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЭЛЕКТРОПРОВОДНОСТЬ -- РАСТВОРЫ ТВЕРДЫЕ -- ОКСИД ВИСМУТА -- ТЕМПЕРАТУРЫ ВЫСОКИЕ
Аннотация: New solid solutions, Bi2 –x–yTmxNbyO3 +δ, with tetragonal and cubic structures have been synthesized in the Bi2O3–Tm2O3–Nb2O5 system, and their electrical conductivity has been measured at temperatures from 670 to 1020 K. The 1020-K conductivity of the tetragonal solid solution Bi1.8Tm0.15Nb0.05O3 +δ is comparable to that of Bi1.75Tm0.25O3, the best conductor in the Bi2O3–Tm2O3 system

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7.
Инвентарный номер: нет.
   
   R 35


   
    Regenerative Energy Conversion using Oxygen Solid Electrolytes / M. V. Patrakeev, A. A. Lakhtin, I. A. Leonidov, A. V. Nikolaev, V. L. Kozhevnikov // Ionics. - 1997. - Vol. 3, № 1-2. - P. 89-95 : il. - Bibliogr. : p. 95 (5 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЭЛЕКТРОЛИТЫ ТВЕРДЫЕ -- ЭЛЕКТРОЛИТЫ КИСЛОРОДНЫЕ
Аннотация: A heat machine is studied of regenerative type, based on solid electrolytes with unipolar oxygen conductivity. The achieved specific power is about 0.2 mW/cm 2. Electrical characteristics are derived as a function of temperature, pressure and gas composition in the working chamber of the converter. Factors which influence the specific power as well as optimal regimes for the functioning of the device are determined

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8.
Инвентарный номер: нет.
   
   M 17


   
    Magnetic and electrical properties of Mg12xCuxO solid solutions and magnetic shielding in Cu–Mg12xCuxO structures / A. A. Samokhvalov, T. I. Arbuzova, N. A. Viglin, V. V. Osipov, N. I. Solin, S. V. Naumov, V. G. Bamburov, N. I. Lobachevskaya, O. G. Reznitskikh // Physics of the Solid State. - 1999. - Vol. 41, № 2. - P262-264 : il. - Bibliogr. : p. 264 (7 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СВЕРХПРОВОДНИКИ -- ОКСИКУПРАТ МАГНИЯ -- ЭЛЕКТРОПРОВОДНОСТЬ
Аннотация: Mg12xCuxO solid solutions having an NaCl structure with 0
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9.
Инвентарный номер: нет.
   
   G 96


    Gusev, A. I.
    The Influence of Imperfection of the Crystal Lattice on the Electrokinetic and Magnetic Properties of Disordered Titanium Monoxide / A. I. Gusev, A. A. Valeeva // Physics of the Solid State. - 2003. - Vol. 45, № 7. - P1242-1250 : il. - Bibliogr. : p. 1249-1250 (36 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МОНООКСИД ТИТАНА -- МАГНИТНЫЕ СВОЙСТВА -- ЭЛЕКТРОКИНЕТИКА
Аннотация: The conductivity and magnetic susceptibility of disordered titanium monoxide TiOy (0.920<= y<=,1.262) containing vacancies in titanium and oxygen sublattices are investigated. For TiOy monoxides with an oxygen content y<=1.069, the temperature dependences of the conductivity are described by the Bloch–Gruneisen function at a Debye temperature ranging from 400 to 480 K and the temperature dependences of the magnetic susceptibility are characterized by the contribution from the Pauli paramagnetism due to conduction electrons. The behavior of the conductivity and magnetic susceptibility of TiOy monoxides with an oxygen content<=y<= 1.087 is characteristic of narrow-gap semiconductors with nondegenerate charge carriers governed by the Boltzmann statistics. The band gap deltaE between the valence and conduction bands of TiOy monoxides with<=y<= 1.087 falls in the range 0.06–0.17 eV

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10.
Инвентарный номер: нет.
   
   S 89


   
    Structure, Ionic Conduction, and Phase Transformations in Lithium Titanate Li4Ti5O12 / I. A. Leonidov, O. N. Leonidova, L. A. Perelyaeva, R. F. Samigullina, S. A. Kovyazina, M. V. Patrakeev // Physics of the Solid State. - 2003. - Vol. 45, № 11. - P2183-2188 : il. - Bibliogr. : p. 2188 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ИОННАЯ ПРОВОДИМОСТЬ -- ФАЗОВЫЙ ПЕРЕХОД -- ТИТАНАТ ЛИТИЯ
Аннотация: The spinel structure of lithium titanate Li4Ti5O12 is refined by the Rietveld full-profile analysis with the use of x-ray and neutron powder diffraction data. The distribution and coordinates of atoms are determined. The Li4Ti5O12 compound is studied at high temperatures by differential scanning calorimetry and Raman spectroscopy. The electrical conductivity is measured in the high-temperature range. It is shown that the Li4Ti5O12 compound with a spinel structure undergoes two successive order–disorder phase transitions due to different distributions of lithium atoms and cation vacancies (vacancy, V) in a defect structure of the NaCl type: (Li)8a[Li0.33Ti1.67]16dO4-> [Li vacancy]16c[Li0.33Ti1.67]16dO4 [Li1.33 vacancy0.67]16c[Ti1.67 vacancy0.33]16dO4. The low-temperature diffusion of lithium predominantly occurs either through the mechanism … ->Li(8a)-> V(16c)->V(8a) … in the spinel phase or through the mechanism … Li(16c) ->V(8a)-> V(16c)-> … in an intermediate phase. In the high-temperature phase, the lithium cations also migrate over 48f vacancies: …->Li(16c)-> V(8a, 48f) ->V(16c) ->….

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