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1.
Инвентарный номер: нет.
   
   O-97

   
    Oxygen Nonstoichiometry and Ionic Conductivity of Sr3Fe2-xScxO7-delta / A. A. Markov, M. V. Patrakeev, V. V. Kharton, Y. V. Pivak, I. A. Leonidov, V. L. Kozhevnikov // Chemistry of Materials. - 2007. - v.19, № 16. - С. 3980-3987. - Bibliogr. : 30 ref.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ КИСЛОРОДНАЯ -- ПРОВОДИМОСТЬ ИОННАЯ -- СКАНДИЙ -- ЖЕЛЕЗО -- СТРОНЦИЙ
Аннотация: The substitution of scandium for iron in the Ruddlesden-Popper Sr3Fe2-xScxO7-delta (x=0-0.3) system increases tetragonal unit-cell volume and oxygen nonstoichiometry and decreases partial p- and n-type electronic conductivities studied in the oxygen partial pressure range from 1 x 10(-20) to 0.7 atm at 973-1223 K. The solubility of Sc(3+) corresponds to approximately x ~ 0.35. The relatively low, temperatureactivated hole mobility indicates a small-polaron mechanism of the electronic transport, as for undoped Sr3Fe2O7-delta. The atomistic computer simulations showed that major contribution to the ionic conductivity is provided by the oxygen sites surrounded by iron cations in the perovskite-type layers of Sr3(Fe,Sc)2O7-delta structure, whereas stable ScO6 octahedra are essentially excluded from the oxygen diffusion processes.??Minimum migration energy, 0.9-1.4 eV, was found for nonlinear pathways formed by the apical O1??sites linking iron-oxygen polyhedra along the c-axis and equatorial O3 positions in the perovskite-type??planes. The direct O3 f O3 jumps are characterized with higher energetic barrier, 1.5-2.2 eV. Because??of the increasing concentration of vacant O3 sites induced by scandium doping, the apparent activation energy for oxygen-ionic transport decreases from about 2 eV, as observed for undoped strontium ferrite at 1123-1223 K, down to 0.95-1.15 eV for Sr3Fe2-xScxO7-delta (x = 0.2-0.3). As a result, the partial ionic conductivity of Sr3Fe1.7Sc0.3O7-delta at temperatures below 1000 K becomes higher than that in Sr3Fe2O7-delta

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2.
Инвентарный номер: нет.
   
   L 55

    Leonidov, I. A.
    The Thermodynamic Properties of Weakly Bound Oxygen and Electron Transport in Sr3Fe2O6 +δ under Oxidizing Conditions / I. A. Leonidov, M. V. Patrakeev, V. L. Kozhevnikov // Russian Journal of Physical Chemistry. - 2006. - Vol. 80, № 4. - P. 523-528 : ил. - Bibliogr. : p. 528 (14 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СВОЙСТВА ТЕРМОДИНАМИЧЕСКИЕ -- ОКСИДЫ -- ЭЛЕКТРОННЫЙ ТРАНСПОРТ -- ПЕРОВСКИТЫ -- ФЕРРИТ СТРОНЦИЯ
Аннотация: The content of oxygen, electrical conductivity, and thermal electromotive force were measured for ferrite Sr3Fe2O6+delta over the oxygen partial pressure range 10(-4)-0.5 atm at 650-950C. The partial molar thermodynamic functions of weakly bound oxygen in the oxide structure were determined. Labile oxygen ions were characterized as an ensemble of weakly interacting particles. The predominant charge carriers under experimental conditions were electron holes. An analysis of conductivity was performed using the data on the oxygen content. The concentration, activation energy, and mobility of charge carriers were determined. The results can be satisfactorily interpreted using the polaron transfer model of conductivity taking into account the charge disproportionation reaction for iron ions, 2Fe(4+)=Fe(3+)+Fe(5+)

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3.
Инвентарный номер: нет.
   
   S 89

   
    Structural features, nonstoichiometry and high-temperature transport in SrFe1-xMoxO3-delta / A. A. Markov, O. A. Savinskaya, M. V. Patrakeev, A. P. Nemudry, I. A. Leonidov, Yu. T. Pavlyukhin, A. V. Ishchenko, V. L. Kozhevnikov // Journal of Solid State Chemistry. - 2009. - Vol. 182, № 4. - P799-806 : il. - Bibliogr. : p. 806 (29 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФЕРРИТ СТРОНЦИЯ -- ПЕРОВСКИТЫ -- НЕСТЕХИОМЕТРИЯ -- РАСТВОРЫ ТВЕРДЫЕ -- ПРОВОДИМОСТЬ
Аннотация: The oxide solid solutions SrFe1-xMoxO3-delta, where x=0.05, 0.1 and 0.2, are studied in this work. It is shown that substitution of iron for molybdenum results in stabilization of a cubic quasi-perovskite locally inhomogeneous structure, which is evidenced by HREM and Mossbauer spectroscopy. The coulometric titration is used in order to determine changes of oxygen nonstoichiometry in the obtained solutions with temperature and ambient oxygen partial pressure. Partial molar thermodynamic functions of the labile oxygen are calculated from the measured data. The variations of partial molar entropy with oxygen content follow the ideal gas model reasonably well thus demonstrating approximately random distribution of oxygen vacancies in the doped ferrite at high temperatures. The partial molar enthalpy is found to increase with doping, which is indicative of a progressive decrease in average values of the bonding energy of labile oxygen ions. The measurements of total conductivity are used in order to determine partial contributions of charge carriers. The oxygen ion component is shown to increase at small level of doping, x=0.05 while further increase in molybdenum content is accompanied with the decline in the ion conductivity. The electron contribution in reducing conditions tends to increase with molybdenum content, which is interpreted as a manifestation of involvement of Mo(5+) cations in electron transport. Concentration and mobility of electron carriers are calculated. Some increase in mobility of electron holes at small doping is explained as related to the filling of oxygen vacancies

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4.
Инвентарный номер: нет.
   
   O-97

   
    Oxygen nonstoichiometry and ion-electron transport in SrFe0.9M0.1O3-delta (M = Cr, Ti, Al) / M. V. Patrakeev, I. A. Leonidov, V. L. Kozhevnikov, V. V. Kharton // Materials Science Forum. - 2006. - vol. 514-516. - P382-386 : il. - Bibliogr. : p. 386 (9 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПРОВОДИМОСТЬ ИОННАЯ -- ФЕРРИТ СТРОНЦИЯ -- НЕСТЕХИОМЕТРИЯ КИСЛОРОДНАЯ
Аннотация: The total conductivity and oxygen deficiency of partially substituted strontium ferrite,??SrFe0.9M0.1O3-д (M=Cr, Ti, Al), at 700-950°C were measured depending on oxygen partial pressure??varying in ranges 10-19-0.5 and 10-5-0.5 atm. The partial contributions of n- and p-type electronic??charge carriers and oxygen ions to the electrical transport were determined analyzing the total??conductivity vs. oxygen pressure dependencies. Additions of all dopants studied in this work are??found to extend the cubic perovskite phase stability range and to improve oxygen transport in the??intermediate-temperature range. The behavior of hole mobility suggests a polaron conduction??mechanism. Doping with aluminum has a weak influence on the mobility level, while the??incorporation of Cr and Ti cations into the ferrite lattice decreases hole mobility up to four times

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5.
Инвентарный номер: нет.
   
   I-70

   
    Investigation of the Conditions for Synthesis of Ce0.9Y0.1O2 Dense Coatings / Yu. A. Bakhteeva, E. V. Shalaeva, I. A. Leonidov, V. L. Kozhevnikov // Glass Physics and Chemistry. - 2008. - Vol. 34, № 4. - P485-491 : il. - Bibliogr. : p. 490-491 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИДЫ СЕЛЕНО-ИТТРИЕВЫЕ -- ПОКРЫТИЯ -- НАНОПОРОШКИ
Аннотация: The conditions for preparation of Ce0.9Y0.1O2 (CYO) oxide coatings on La0.8Sr0.2MnO3(LSM) ceramic substrates by screen printing were investigated. The CYO compound was synthesized by the pyrolysis of polymer–salt composites with the aim of producing submicron powders with a uniform size distribution. Transmission electron microscopy of the microstructure of the CYO compound synthesized with ethylene glycol revealed that the synthesis product consists of ultrafine crystalline particles with an average size of 5–15 nm. The use of CYO nanopowders made it possible to prepare rather dense single-layer coatings on LSM substrates. It was demonstrated that annealing of the coatings at high temperatures leads to the recrystallization and coarsening of particles

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6.
Инвентарный номер: нет.
   
   H 65

   
    High-Temperature Equilibrium between YBa2Cu 3- xCoxO 6 + delta Solid Solutions and Oxygen / M. V. Patrakeev, E. B. Mitberg, A. A. Lakhtin, I. A. Leonidov, V. L. Kozhevnikov, V. I. Voronin // Inorganic Materials. - 2000. - Vol. 36, № 5. - P. 474-478 : il. - Bibliogr. : p.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
РАСТВОРЫ ТВЕРДЫЕ -- ТИТРОВАНИЕ -- КИСЛОРОД -- КУПРАТЫ КОБАЛЬТСОДЕРЖАЩИЕ
Аннотация: The equilibrium oxygen content of YBa2Cu3_ xCoxO6 + 8 (0.2 < x < 0.8) solid solutions was determined by coulometric titration at temperatures in the range 600-850~ and oxygen pressures 1 < Po2 < 105 Pa. The partial enthalpy and entropy of oxygen dissolution were evaluated as a function of composition. The thermodynamic functions were found to change sharply near the high- and low-oxygen limits of the solid solution. The results are interpreted in terms of a quasi-chemical model considering three inequivalent oxygen sites in the basal plane

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7.
Инвентарный номер: нет.
   
   S 53

    Shein, I. R.
    Electronic and magnetic properties of new quaternary oxybismuthides LaOMBi(where M= V, Cr, . . . , Ni, Cu) from first principles / I. R. Shein, V. L. Kozhevnikov, A. L. Ivanovskii // Physics Letters A. - 2008. - Vol. 372. - P.5838-5840 : il. - Bibliogr. : p. 5840 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СВОЙСТВА ЭЛЕКТРОННЫЕ -- СВОЙСТВА МАГНИТНЫЕ -- ОКСИВИСМУТИДЫ МЕТАЛЛОВ -- МАТЕРИАЛЫ СВЕРХПРОВОДЯЩИЕ
Аннотация: For prediction of new parent phases for Fe-containing superconducting materials by means of the FPLAPW-GGA method the structural, electronic and magnetic properties of series of quaternary oxybismuthides LaOMBi (where M= V, Cr, . . . , Ni, Cu) are investigated for the first time. Our preliminary conclusion is that LaONiBi may be a suitable phase for search of new superconducting materials

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8.
Инвентарный номер: нет.
   
   T 44

   
    The Effect of Divalent Cations on the Structural Parameters, Phase Transitions, and Electrical Conductivity of Oxygen Conductors Based on LaGaO / I. A. Leonidov, I. V. Baklanova, L. A. Perelyaeva, O. N. Leonidova, R. F. Samigullina, V. L. Kozhevnikov // Doklady Chemistry. - 2009. - Vol. 427, № 2. - P. 194-198 : il. - Bibliogr. : p. 198 (10 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КАТИОНЫ -- ФАЗОВЫЕ ПЕРЕХОДЫ -- ЭЛЕКТРОПРОВОДНОСТЬ -- ПЕРОВСКИТОПОДОБНЫЕ ОКСИДЫ

\\\\Expert2\\nbo\\Doklady Chemistry\\2009, v. 427, N 2, p. 194-198.pdf
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9.
Инвентарный номер: нет.
   
   M 45

   
    Mechanisms of hopping conductivity in weakly doped La1-xBaxMnO3 [Текст] / R. Laiho, K. G. Lisunov, E. Laehderanta, M. A. Shakhov, V. N. Stamov, V. S. Zakhvalinskii, V. L. Kozhevnikov, I. A. Leonidov, E. B. Mitberg, M. V. Patrakeev // Journal of Physics: Condensed Matter. - 2005. - Vol. 17, № 21. - С. 3429-3444. - Библиогр. : с. 3444 (35 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КЕРАМИКА -- МАНГАНИТЫ
Аннотация: The resistivity, ρ, of ceramic La1−xBaxMnO3 with x = 0.02–0.10 corresponding to the concentrations of holes c ≈ 0.15–0.17 displays an activated behaviour both above and below the paramagnetic to ferromagnetic transition temperature TC = 175–209 K, obtained from measurements of the magnetization. Above T~ 310–390 K ρ(T, x) is determined by nearest-neighbour hopping of small polarons with activation energy Ea = 0.20–0.22 eV. Below the onset temperature Tv = 250–280 K, depending on x, a Shklovskii–Efros-like variable-range hopping conductivity mechanism, governed by a soft temperature independent Coulomb gap, The resistivity, ρ, of ceramic La1−xBaxMnO3 with x = 0.02–0.10 corresponding to the concentrations of holes c ≈ 0.15–0.17 displays an activated behaviour both above and below the paramagnetic to ferromagnetic transition temperature TC = 175–209 K, obtained from measurements of the magnetization. Above T ~ 310–390 K ρ(T, x) is determined by nearest-neighbour hopping of small polarons with activation energy Ea = 0.20–0.22 eV. Below the onset temperature Tv = 250–280 K, depending on x, a Shklovskii–Efros-like variable-range hopping conductivity mechanism, governed by a soft temperature independent Coulomb gap, ≈ 0.44–0.46 eV, and a rigid gap, δ(T ), is found. For the range T ~ 50–120K, δ(T ) is connected to the formation of small lattice polarons in conditions of strong electron– phonon interaction and lattice disorder. The rigid gap obeys a law δ(T ) ~ T 1/2 within two temperature intervals above and below TC, exhibits an inflection at TC and reaches at Tv a value of δv ≈ 0.14–0.18 eV. Such behaviour suggests a spin dependent contribution to δ(T ). The localization radius of the charge carriers, a, has different constant values within the temperature intervals where δ(T ) ~ T 1/2. With further decrease of T , a increases according to the law expected for small lattice polarons ≈ 0.44–0.46 eV, and a rigid gap, δ(T ), is found. For the range T ~ 50–120K, δ(T ) is connected to the formation of small lattice polarons in conditions of strong electron– phonon interaction and lattice disorder. The rigid gap obeys a law δ(T ) ~ T 1/2 within two temperature intervals above and below TC, exhibits an inflection at TC and reaches at Tv a value of δv ≈ 0.14–0.18 eV. Such behaviour suggests a spin dependent contribution to δ(T ). The localization radius of the charge carriers, a, has different constant values within the temperature intervals where δ(T ) ~ T 1/2. With further decrease of T , a increases according to the law expected for small lattice polarons

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10.
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   I-60

   
    Influence of the phase separation effect on low-field magnetic properties of La1-xBaxMnO3 [Текст] / R. Laiho, K. G. Lisunov, E. Laehderanta, V. S. Zakhvalinskii, V. L. Kozhevnikov, I. A. Leonidov, E. B. Mitberg, M. V. Patrakeev // Journal of Magnetism and Magnetic Materials. - 2005. - Vol. 293, № 3. - С. 892-902
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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