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Труды сотрудников Института химии твердого тела УрО РАН
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1.
Инвентарный номер: нет.
   
   K 80

    Kozhevnikov, V. L.
    Ion transport membrane technology for the primary processing of natural gas / V. L. Kozhevnikov, I. A. Leonidov, M. V. Patrakeev // Wit Transactions on Ecology and THE Environment . - 2014. - Vol. 190, № 2. - P809-820
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПЕРЕНОС ИОННЫЙ -- ПЕРЕРАБОТКА -- ГАЗ ПРИРОДНЫЙ

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2.
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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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.
   
   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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5.
Инвентарный номер: нет.
   
   O-97

   
    Oxygen Nonstoichiometry and the Thermodynamic and Structural Properties of Double Perovskites PrBaCo2-xCuxO5+δ / A. Yu. Suntsov, I. A. Leonidov, A. A. Markov, M. V. Patrakeev, Ya. N. Blinovskov, V. L. Kozhevnikov // Russian Journal of Physical Chemistry A. - 2009. - Vol. 83, № 5. - P832-838 : il. - Bibliogr. : p. 838 (11 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ -- ДВОЙНЫЕ ПЕРОВСКИТЫ -- РЗМ -- БАРИЙ
Аннотация: The special features of the structure, electrophysical properties, and oxygen nonstoichiometry of new double perovskites PrBaCo2 –xCuxO5 +δ were studied. Within the homogeneity region with respect to copper 0
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6.
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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7.
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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8.
Инвентарный номер: нет.
   
   T 44

   
    The Structure, Nonstoichiometry, and Thermodynamic Characteristics of Oxygen in Strontium Ferrite Doped with Niobium, SrFe1-xNbxO3-δ / P. V. Anikina, A. A. Markov, M. V. Patrakeev, I. A. Leonidov, V. L. Kozhevnikov // Russian Journal of Physical Chemistry A. - 2009. - Vol. 83, № 5. - P699-704 : il. - Bibliogr. : p. 704 (14 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ -- КИСЛОРОД -- ФЕРРИТ СТРОНЦИЯ -- ДОПИРОВАНИЕ -- НИОБИЙ
Аннотация: The influence of doping with niobium on the structure and oxygen nonstoichiometry of strontium ferrite SrFe1 –xNbxO3 –δ(x= 0.05, 0.1, 0.2, 0.3, and 0.4) was studied. The content of oxygen in the doped derivatives was determined by coulometric titration as a function of temperature (650–950°C) and oxygen partialpressure in the gas phase (10–4–1 atm). The partial molar enthalpies ΔΉo(x,δ) and entropies ΔSo(x,δ) of oxygen in SrFr1−xNbxO3 –δ were calculated. An analysis of ΔSo(x,δ) dependences showed that the model of a random distribution of ions and vacancies over accessible sites in the oxygen sublattice allowed the experimental data to be described satisfactorily. An increase in the partial enthalpy ΔHo(x,δ) as nonstoichiometry δ decreased was indicative of weak repulsive interactions between oxygen ions in the structure of SrFe1 –xNbxO3 –δ

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9.
Инвентарный номер: нет.
   
   B 17

    Baklanova, I. V.
    Synthesis and Vibrational Spectra of Solid Solutions Based on Lanthanum Gallate / I. V. Baklanova, I. A. Leonidov, L. A. Perelyaeva // Bulletin of the Russian Academy of Sciences: Physics. - 2008. - Vol. 72, № 10. - P.1343-1346 : il. - Bibliogr. : p. 1346 (6 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
РАСТВОРЫ ТВЕРДЫЕ -- ГАЛЛАТ ЛАНТАНА
Аннотация: The synthesis conditions for single-phase solid solutions based on lanthanum gallate, LaGa1 –xMgxO3 –delta(x= 0–0.25, solid-phase method) and La 1- ySryGa1 –yMgyO3 –delta (y= 0–0.2, glycine nitrate method), have been investigated. The structural parameters have been calculated using X-ray powder diffraction data. The IR and Raman spectra have been analyzed. Regularities in the changes in the structural parameters and vibrational spectra with composition are established

\\\\Expert2\\nbo\\Bulletin of the Russian Academy of Sciences Physics\\2008, V. 72, N 10, P. 1343-1346.pdf
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10.
Инвентарный номер: нет.
   
   C 91

   
    Crystal Structure and Optical Properties of Germanates Ln2Ca(GeO3)2 (Ln=Gd, Ho, Er, Yb, Y) / V. G. Zubkov, I. A. Leonidov, A. P. Tyutyunnik, N. V. Tarakina, I. V. Baklanova, L. A. Perelyaeva, L. L. Surat // Physics of the Solid State. - 2008. - Vol. 50, № 9. - P1699-1706 : il. - Bibliogr. : p. 1706 (19 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СЛОИСТЫЕ СОЕДИНЕНИЯ -- ГЕРМАНАТЫ
Аннотация: This paper reports on the results of structural and optical investigations of a new class of layered compounds Ln2Ca(GeO3)4(Ln= Gd, Ho, Er, Yb, Y), which are promising for the use in photonics as converters of laser radiation

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11.
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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12.
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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13.
Инвентарный номер: нет.
   
   H 65

   
    High-temperature phase equilibria in the oxide systems SrFe1-xGaxO2.5-SrFe1-xGaxO3 (x = 0, 0.1, 0.2) [Text] / I. A. Leonidov, M. V. Patrakeev, J. A. Bahteeva, E. B. Mitberg, V. L. Kozhevnikov, Ph. Colomban, K. R. Poeppelmeier // Journal of Solid State Chemistry. - 2006. - Vol. 179, № 4. - P.1093-1099. - Bibliogr. : p. 1099 (17 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФАЗОВЫЕ РАВНОВЕСИЯ -- СИСТЕМЫ ОКСИДНЫЕ -- ВЫСОКОТЕМПЕРАТУРНЫЕ ФАЗОВЫЕ ДИАГРАММЫ -- ГАЛЛИЙ -- ДОБАВКИ
Аннотация: X-ray powder diffraction, Raman scattering, equilibrium oxygen content and conductivity data are combined to construct high-temperature phase diagrams (T vs. delta) for the oxide systems SrFe1-xGaxO2.5–SrFe1-xGaxO3, where , 0.1, and 0.2. Depending on oxygen content and gallium doping, three different structural types are shown to exist at high temperatures including cubic perovskite-, cubic brownmillerite-, and orthorhombic brownmillerite-type structures. Substitution of gallium for iron is shown to extend the oxygen content and temperature limits where the cubic brownmillerite-type phase is stable

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14.
Инвентарный номер: нет.
   
   O-97

   
    Oxygen-ion and electron conductivity in Sr2Fe2-2xGaxO5 [Текст] / I. A. Leonidov, M. V. Patrakeev, J. A. Bahteeva, K. V. Poholok, D. S. Filimonov, K. R. Poeppelmeier, V. L. Kozhevnikov // Journal of Solid State Chemistry. - 2006. - Vol. 179, № 10. - С. 3045-3051
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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15.
Инвентарный номер: нет.
   
   S 89

   
    Structural stability and ion transport in LaSr2Fe1-yCryO8+δ / V. L. Kozhevnikov, I. A. Leonidov, M. V. Patrakeev, J. A. Bahteeva // NATO Science Series II Mathematics, Physics and Chemistry, 2006, Volume 202, Fuel Cell Technologies State and Perspectives. - 2006. - Vol. 202: Fuel Cell Technologies State and Perspectives. - P149-155 : il. - Bibliogr. : p. 155 (2 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КИСЛОРОДНАЯ ПРОВОДИМОСТЬ -- ЭЛЕКТРОННАЯ ПРОВОДИМОСТЬ -- ФЕРРИТЫ ЛАНТАН-СТРОНЦИЕВЫЕ -- ПЕРОВСКИТЫ
Аннотация: Ceramic samples of LaSr2Fe3-yCryO8+δ are characterized with X-ray powder diffraction and total conductivity measurements in the temperature range 750- 950°C and at oxygen partial pressures between 10-22 and 0.5 atm. It is shown that partial replacement of iron for chromium is an effective means to prevent structural transformation at the loss of oxygen. The isothermal ion conductivity is obtained from the analysis of the total conductivity, and it is shown to decrease with the increase in chromium doping to y = 0.6. However further increase in the chromium content to y = 1 results in an increase in the oxygen ion conductivity level. This behavior is explained with a model where the oxygen ions coordinated to chromium are not excluded entirely from the transport mechanism

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16.
Инвентарный номер: нет.
   
   T 44

   
    Thermodynamic and structural properties of PrBaCo2O5+delta [Text] / I. A. Leonidov, M. V. Patrakeev, E. B. Mitberg, O. N. Leonidova, V. L. Kozhevnikov // Inorganic Materials. - 2006. - Vol. 42, № 2. - P196-201 : il. - Библиогр. : с. 201 (4 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ТЕРМОДИНАМИЧЕСКИЕ СВОЙСТВА -- КОБАЛЬТИТ ПРАЗЕОДИМА -- КАЛОРИМЕТРИЧЕСКИЕ ИССЛЕДОВАНИЯ -- ТИТРОВАНИЕ
Аннотация: The oxygen content of the double cobaltite PrBaCo2O5 +δ was determined by coulometric titration in broad temperature and oxygen pressure ranges, and the partial thermodynamic functions of oxygen were evaluated. The results on the nonstoichiometry and structural properties of PrBaCo2O5 +δ demonstrate that, at 5 +δ< 5.3, this cobaltite has a high-temperature phase with lattice parameters a = 11.774 Å, b = 11.932 Å, and c = 7.609 Å. The composition dependences of ΔH(O) and ΔS(O) indicate that the 3ap×3ap×2ap orthorhombic structure persists in the range 5.15≤5 +δ≤5.30. Some of the Co3+ ions are shown to disproportionate according to the scheme 2Co(3+)= Co(2+)+CoÓ4+

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17.
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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18.
Инвентарный номер: нет.
   
   O-97

   
    Oxygen nonstoichiometry and mixed conductivity of SrFe1-xMxO3-delta (M = Al, Ga). Effects of beta-site doping [Текст] / M. V. Patrakeev, V. V. Kharton, Yu. A. Bakhteeva, A. L. Shaula, I. A. Leonidov, V. L. Kozhevnikov, E. N. Naumovich, A. A. Yaremchenko, F. M. B. Marques // Solid State Sciences. - 2006. - Vol. 8, № 5. - С. 476-487
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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19.
Инвентарный номер: нет.
   
   I-76

   
    Ion and electron conduction in SrFe1-xScxO3-delta [Text] / M. V. Patrakeev, A. A. Markov, I. A. Leonidov, V. L. Kozhevnikov, V. V. Kharton // Solid State Ionics. - 2006. - Vol. 177, № 19-25. - P.1757-1760. - Bibliogr. : p. 1760 (12 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ИОННАЯ ПРОВОДИМОСТЬ, ЭЛЕКТРОННАЯ ПРОВОДИМОСТЬ -- СТРОНЦИЙ -- ЖЕЛЕЗО -- СКАНДИЙ -- НЕСТЕХИОМЕТРИЯ
Аннотация: The oxygen ion and electron transport in SrFe1-xScxO3-delta (x =0.1–0.3) system at 700–950 -C were studied analyzing the total conductivity dependencies on the oxygen partial pressure, pO2. The conductivity measurements were performed both under reducing conditions (10(-19)<=pO2<=10(-8) atm) comprising the electron-hole equilibrium point, and in oxidizing atmospheres (10(-5)<=pO2<=0.5 atm) which are??characterized by extensive variations of the oxygen content studied by coulometric titration technique. The incorporation of 10% Sc3+ cations into the iron sublattice suppresses transition of the cubic perovskite phase into vacancy-ordered brownmillerite, thus improving ion conduction at temperatures below 850 -C. When scandium content increases, the ion conductivity becomes considerably lower. The hole mobility is thermallyactivated and varies in the range of 0.001 to 0.05 cm(2) V(-1) s(-1), increasing with oxygen concentration and decreasing on Sc doping

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20.
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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