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1.
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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2.
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   T 82

   
    Transport properties and thermal expansion of Ti-substituted La1-xSrxFeO3-delta (x = 0.5-0.7) [Текст] / E. V. Tsipis, M. V. Patrakeev, V. V. Kharton, A. A. Yaremchenko, G. C. Mather, A. L. Shaula, I. A. Leonidov, V. L. Kozhevnikov, J. R. Frade // Solid State Sciences. - 2005. - Vol. 7, № 4. - С. 355-365
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Рубрики: ХИМИЧЕСКИЕ НАУКИ

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3.
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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4.
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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5.
Инвентарный номер: нет.
   
   T 44

   
    Thermal Ion Emission from Alkali-Metal Vanadium Bronzes / L. V. Kudrina, N. V. Svedlov, V. S. Petrov, L. L. Surat, I. A. Leonidov, A. A. Fotiev // Inorganic Chemistry. - 2000. - Vol. 36, № 8. - P. 799-801 : il. - Bibliogr. : p. 801 (4 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЭМИССИЯ ИОННАЯ -- БРОНЗЫ ВАНАДИЕВЫЕ -- МЕТАЛЛЫ ЩЕЛОЧНЫЕ
Аннотация: The ion emission properties of MxV205 (M = Li, Na, K, Cs) bronzes were studied at temperatures from 480 to 700~ in applied fields of up to 20 kV/cm. The results were used to evaluate the activation energies of alkali-metal-ion emission from the vanadium bronzes. The emission properties of the bronzes were found to correlate with their diffusion properties. The mechanisms of ion emission from vanadium bronzes are discussed

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6.
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   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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7.
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   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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8.
Инвентарный номер: нет.
   
   T 44

   
    The relation between high-temperature thermopower, conductivity and oxygen content in YBa2Cu3O6+x [] / E. B. Mitberg, M. V. Patrakeev, A. A. Lakhtin, I. A. Leonidov, V. L. Kozhevnikov, K. R. Poeppelmeier // Journal of Alloys and Compounds. - 1998. - V. 274, N 1-2. - С. 103-109 . - ISSN 0925-8388
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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ХИМИЯ -- КИСЛОРОД -- ВЫСОКОТЕМПЕРАТУРНАЯ ПРОВОДИМОСТЬ -- ПРОВОДИМОСТЬ ВЫСОКОТЕМПЕРАТУРНАЯ -- ТЕРМОДИНАМИКА -- СВЕРХПРОВОДНИКИ

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9.
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.)
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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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10.
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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11.
Инвентарный номер: нет.
   
   S 98

   
    Synthesis and Structure of (Ca,Sr)-Substituted Lanthanum Manganite [Text] / B. V. Slobodin, E. V. Vladimirova, S. L. Petukhov, L. L. Surat, I. A. Leonidov // Inorganic Materials. - 2005. - Vol. 41, № 8. - P.869-875 : il. - Библиогр. : с. 875 (41 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МАНГАНИТЫ -- ЛАНТАН -- ТВЕРДЫЕ РАСТВОРЫ -- КАЛЬЦИЙ -- СТРОНЦИЙ
Аннотация: The phase composition and structure of equilibrium LaMnO3–CaMnO3–SrMnO3 samples prepared at 1500°C in air are investigated. The results demonstrate that the system contains a broad region of La1−x(Ca1−ySry)xMnO3 perovskite-like solid solutions in which calcium and strontium cations substitute for lanthanum. The solid solutions have an orthorhombic (Pnma), rhombohedral (R3c ), or tetragonal (I4/mcm) structure, depending on the A-site cation composition and the nature of lattice distortions. The composition regions of these structures and two-phase regions are mapped out in the LaMnO3–CaMnO3–SrMnO3 phase diagram

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12.
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   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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13.
Инвентарный номер: нет.
   
   S 89

   
    Structure and Transport Properties of Li1- 2xCO1 + xVO4 Lithium Ionic Conductors / I. A. Leonidov, R. F. Samigullina, O. N. Leonidova, B. V. Slobodin, M. V. Patrakeev, O. V. Koryakova // Inorganic Chemistry. - 2000. - Vol. 36, № 9. - P. 942-946 : il. - Bibliogr. : p. 945-946 (10 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СВОЙСТВА ТРАНСПОРТНЫЕ -- ПРОВОДНИКИ ИОННЫЕ -- ШПИНЕЛИ -- ВАНАДАТЫ -- ЛИТИЙ
Аннотация: Li 1-x 2xCo 1 + xVO4 (0 < x <= 0.25) spinel solid solutions were synthesized and characterized by x-ray diffraction and IR spectroscopy. The materials were found to have a cubic structure in the composition range 0 < x <= 0.1 and an orthorhombic structure for x > 0.1. The observed lattice distortions were shown to correlate with Co content. The conductivity of the solid solutions was measured as a function of temperature and oxygen partial pressure. The ionic and electronic (n and p) conductivities were determined. The conduction in the solid solutions was shown to be dominated by Li + ions

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14.
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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15.
Инвентарный номер: нет.
   
   S 89

   
    Structural stability and ion transport in LaSr2Fe1-yCryO8+delta [Текст] / V. L. Kozhevnikov, I. A. Leonidov, M. V. Patrakeev, J. A. Bahteeva // NATO Science Series, II: Mathematics, Physics and Chemistry. - 2005. - № 202. - С. 149-155
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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16.
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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17.
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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18.
Инвентарный номер: нет.
   
   S 89

   
    Structural aspects of lithium transferin solid electrolytes Li2xZn2–3xTi1+xO4 (0.33 / I. A. Leonidov, O. N. Leonidova, R. F. Samigullina, M. V. Patrakeev // Journal of Structural Chemistry. - 2004. - Vol. 45, № 2. - P.262-268 : ил. - Bibliogr. : p. 268 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
РАСТВОРЫ ТВЕРДЫЕ -- ЭЛЕКТРОЛИТЫ ТВЕРДЫЕ -- ЛИТИЙ -- ПРОВОДИМОСТЬ -- ШПИНЕЛИ
Аннотация: Solid solutions Li2xZn2–3xTi1+xO4, where x = 1/3, 1/2, 3/5, 2/3, were studied by powder X-ray diffractometry and differential thermal analysis. Conductivity measurements have been performed in the gas phase at different temperatures and oxygen pressures. Distribution of cations over the sites of the spinel structure has been determined. Conductivity increases substantially with lithium concentration. The high lithium conductivity of Li3Zn0.5Ti4O10 (x = 3/5) and Li4Ti5O12 (x = 2/3) is the result of two sequential phase transitions associated with different lithium distributions in high-temperature phases with defective NaCl type structures. Possible routes of lithium ion transport are discussed and rationalized based on the conductivity and crystal data

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19.
Инвентарный номер: нет.
   
   S 89

   
    Strontium diffusion in Sr3-3xLa2x„x(VO4)2 solid solutions / O. N. Leonidova, I. A. Leonidov, G. I. Dontsov, A. S. Zhukovskaya // Physics of the Solid State. - 1998. - Vol. 40, № 2. - P200-203 : il. - Bibliogr. : p. 203 (10 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СТРОНЦИЙ -- ТВЕРДЫЕ РАСТВОРЫ -- КОЭФФИЦИЕНТ ДФФУЗИИ
Аннотация: Layer-by-layer radiometric analysis in the temperature range 800–950 °C was used to measure the diffusion coefficients of 90Sr, 45Ca, 133Ba radionuclides in Sr3-3xLa2x vacancy x(VO4)2 (x=50,0.1,0.15,0.2,0.25) solid solutions. It was established that DCa *> .DSr *>.DBa * . An increase in the concentrations of vacancies in the strontium sublattice leads to increased coefficients of diffusion of rare-earth metal cations. The activation energies for radionuclide diffusion were determined. It was shown that M21 cations migrate via Sr(2) positions

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20.
Инвентарный номер: нет.
   
   Z 18

    Zainullina, V. M.
    Specific Features of the Formation of Oxygen Defects in the SrFeO2.5 Ferrate with a Brownmillerite Structure / V. M. Zainullina, I. A. Leonidov, V. L. Kozhevnikov // Physics of the Solid State. - 2002. - Vol. 44, № 11. - P2063-2066 : il. - Bibliogr. : p. 2066 (20 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФЕРРАТ СТРОНЦИЯ -- ДЕФЕКТНЫЕ ОКСИДЫ
Аннотация: The electronic structure and chemical bonding in the Sr2Fe2O5 strontium ferrate are investigated in the framework of the ab initio linear-muffin-tin-orbital tight-binding representation and extended Hukcel calculations. Models of defect formation (oxygen vacancies and anti-Frenkel defects) in the brownmillerite structure are considered. A model of ion transfer in strontium ferrate is proposed reasoning from the results of the calculations

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