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1.
Инвентарный номер: нет.
   
   S 98


   
    Synthesis and Properties of High-Pressure Phase [ErxCu3](V4)O12 / N. I. Kadyrova, N. V. Melnikova, I. S. Ustinova, A. N. Babushkin, A. V. Korolev, Yu. G. Zaynulin // Bulletin of the Russian Academy of Sciences: Physics. - 2009. - Vol. 73, № 11. - P. 1539-1541 : il. - Bibliogr. : p. 1541 (5 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СОЕДИНЕНИЯ ПЕРОВСКИТОПОДОБНЫЕ -- ЭРБИЙ -- ЭЛЕКТРОПРОВОДНОСТЬ
Аннотация: A new perovskite-like compound Er0.73Cu3V4O12 (space group Im3, Z = 2, a = 7.266 Å) has been synthesized barothermally (P = 8.0 GPa, t = 1000°C). Its electrical and magnetic properties have been studied. It is found that the temperature dependence of the electrical conductivity (in the range 78–300 K) has of semiconductor type. The behavior of the impedance and admittance has been analyzed at 290 K and frequencies of 200 Hz to 200 kHz under atmospheric pressure and at high (15–42 GPa) pressures

\\\\Expert2\\nbo\\Bulletin of the Russian Academy of Sciences Physics\\2009, V. 73, N 11, P. 1539-1541.pdf
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2.
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   S 53


    Shein, I. R.
    First principle prediction of vacancy-induced magnetism in non-magneticperovskite SrTiO3 / I. R. Shein, A. L. Ivanovskii // Physics Letters A. - 2007. - Vol. 371. - P. 155-159 : il. - Bibliogr. : p. 159 (32 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ВАКАНСИИ РЕШЕТОК -- СТРУКТУРА ЭЛЕКТРОННАЯ -- МАГНЕТИЗМ -- ПЕРОВСКИТЫ -- SrTiO3
Аннотация: A theoretical study of magnetization in non-magnetic cubic perovskite SrTiO3 induced by vacancies in Sr, Ti and oxygen sublattices is presented using the full-potential linear augmented plane wave (FP-LAPW) method within the generalized gradient approximation (GGA) for the exchange correlation potential. The results show that the oxygen and titanium vacancies lead to the magnetization of non-magnetic perovskite SrTiO3 due to the spin-polarization of valence states for the Ti and O atoms, nearest to these vacancies. In result the insulating SrTiO3 becomes metallic-like with magnetic moments (per cell) 1.30 мB and 3.54 мB for non-stoichiometric SrTiO3.д and SrTi1-deltaO, respectively. On the contrary, our calculations reveal that for Sr vacancy the non-magnetic state of perovskite is retained, whereas the electronic spectrum of Sr1-deltaTiO3 also adopts metallic-like type

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3.
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   В 58


   
    Влияние высоких давлений на электрические свойства перовскитоподобных фаз ACu3V4O12 = Effect of high pressures on electrical properties of the perovskite-like phases ACu3V4O12 / Н. В. Мельникова, Н. И. Кадырова, И. С. Устинова, Ю. Г. Зайнулин, А. Н. Бабушкин // Известия РАН. Серия физическая. - 2012. - Т. 76, № 3. - С. 369-372 : граф. - Библиогр.: с. 371-372 (18 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФАЗЫ ПЕРОВСКИТОПОДОБНЫЕ -- ВЫСОКИЕ ДАВЛЕНИЯ -- ПЕРОВСКИТЫ СЛОЖНООКСИДНЫЕ
Аннотация: Исследованы электрические свойства новых перовскитоподобных соединений ACu3V4O12 (A = Gd, Er, Tm) при высоких давлениях (10–50 ГПа). Проанализировано влияние состава и структуры соединений на барические области существенных изменений в поведении электрических характеристик

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4.
Инвентарный номер: нет.
   
   S 98


   
    Synthesis of La1-xSrxMnO3+delta Manganites by Pyrohydrolysis of Nitrates / E. V. Mikhaleva, V. G. Vasil'ev, A. P. Nosov, E. V. Vladimirova, B. V. Slobodin // Glass Physics and Chemistry. - 2009. - Vol. 35, № 1. - P.81-86 : il. - Bibliogr. : p. 85-86 (29 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МАНГАНИТЫ ПЕРОВСКИТОПОДОБНЫЕ -- ПИРОГИДРОЛИЗ НИТРАТОВ -- МАГНИТОСОПРОТИВЛЕНИЕ
Аннотация: Single-phase finely dispersed perovskite-like manganites La1 –xSrxMnO3 +δ (0≤x≤0.33) with an average particle size of approximately 3μm were synthesized by the pyrohydrolytic method from a stoichiometric mixture of the corresponding metal nitrates at a temperature of 500° C in a water vapor atmosphere. The parameter δ was changed as a result of the subsequent heat treatment. It was established that the manganite La0.67Sr0.33MnO3 +δ synthesized by the pyrohydrolytic method is characterized by a more pronounced change in the magnetoresistance as compared to the manganite that had the same composition but was synthesized according to the conventional ceramic technique

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5.
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   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.)
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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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6.
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   N 11


   
    Na0.25Cu0.75VO3: A New Perovskite-like Vanadium Bronze / V. L. Volkov, N. I. Kadyrova, G. S. Zakharova, Yu. G. Zainulin, T. V. D'yachkova, A. P. Tyutyunnik, V. G. Zubkov // Inorganic Materials. - 2004. - Vol. 40, № 2. - P. 184-187 : il. - Bibliogr. : p. 187 (13 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
БРОНЗЫ ВАНАДИЕВЫЕ -- СВОЙСТВА ТЕРМИЧЕСКИЕ
Аннотация: A new cubic perovskite-like vanadium bronze of composition Na0.25Cu0.75VO3, with a lattice parameter of 7.2517(1) Å, is obtained by reacting NaVO3, V2O5, and Cu2O at 1100°C and 8 GPa. It exhibits metallic conduction, with a sharp change in resistivity above 200°C, and, presumably, undergoes a phase transition near 280°C. The thermal properties of the new vanadium bronze are studied in air and helium at normal pressure

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7.
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   K 48


    Kirsanov, N. A.
    Electrical and Magnetic Properties of the Pr2/3 + xTiO3 ± y Perovskite Phase / N. A. Kirsanov, G. V. Bazuev // Inorganic Materials. - 2001. - Vol. 37, № 5. - P. 487-490 : il. - Bibliogr. : p. 490 (17 ref.)
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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
БРОНЗЫ ПРАЗЕОДИМ-ТИТАНОВЫЕ -- СВОЙСТВА ЭЛЕКТРИЧЕСКИЕ -- СВОЙСТВА МАГНИТНЫЕ -- ТЕРМОЭДС
Аннотация: The thermoelectric power, electrical resistivity, and magnetic susceptibility of the praseodymium titanium bronze phase Pr2/3 + xTiO3 ± y were measured for compositions in the range 0 <= x <= 1/3. The conductivity of the bronze was found to exhibit metallic behavior between 77 and 450 K. The transport data were used to evaluate the electron mobility and Fermi energy. In the range 77–300 K, the magnetic susceptibility of Pr2/3 + xTiO3 ± y consists two contributions—those from Pr3+ (a strong function of temperature) and Ti3+ (a weak function of temperature)

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8.
Инвентарный номер: нет.
   
   I-98


    Ivanovskii, A. L.
    Electronic properties of the Ti3AlN perovskite [Text] / A. L. Ivanovskii, N. I. Medvedeva, D. L. Novikov // Physics of the Solid State. - 1997. - Vol. 39, №6. - P929-931. - Библиогр. : с. 931 (11 ref.)
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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЭЛЕКТРОННЫЕ СВОЙСТВА -- ПЕРОВСКИТЫ -- ПЕРЕХОДНЫЕ МЕТАЛЛЫ -- НИТРИДЫ

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9.
Инвентарный номер: нет.
   
   I-76


   
    Ion-electron transport in strontium ferrites: relationships with structural features and stability [Text] / M. V. Patrakeev, I. A. Leonidov, V. L. Kozhevnikov, V. V. Kharton // Solid State Sciences. - 2004. - Vol. 6, № 9. - P907-913. - Bibliogr. : p. 913 (27 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФЕРРИТ СТРОНЦИЯ -- НЕСТЕХИОМЕТРИЯ КИСЛОРОДНАЯ -- ПРОВОДИМОСТЬ ИОННАЯ -- ИОННЫЙ ПЕРЕНОС -- ЭЛЕКТРОННЫЙ ТРАНСПОРТ
Аннотация: The total electrical conductivity of strontium ferrites, including intergrowth Sr4Fe6O13+delta, Sr3Fe2O6+delta with a Ruddlesden-Popper??structure, and SrFeO2.5+delta where the cubic perovskite lattice transforms into vacancy-ordered brownmillerite at p(O2) < 10 Pa and??T < 850 .C, was measured at 650.1000 .C in the oxygen partial pressure range 10.15 Pa to 50 kPa. The data were used in order to determine partial ion, p- and n-type electron contributions in the vicinity of electron.hole equilibrium point. The ferrites with brownmillerite and Ruddlesden-Popper structures exhibit substantial ion transport due to thermally-activated disordering of oxygen vacancies and??oxygen ions in the perovskite structural slabs, whereas the ion conductivity of Sr4Fe6O13+delta remains below 0.01 S cm.1 in the studied??conditions. The bonding energy of oxygen ions, evaluated from the formation enthalpy of n-type charge carriers, increases in the sequence??Sr4Fe6O13+delta < SrFeO3+delta < Sr3Fe2O6delta. These values correlate with thermodynamic stability of strontium ferrites at low p(O2). The??transition of SrFeO2.5+delta brownmillerite into disordered cubic phase above 850 .C leads to higher stability in reducing atmospheres. The??level of p-type conductivity is mainly governed by the concentration of electron holes, which was calculated from the oxygen content??determined by coulometric titration technique. The hole mobility, which is quite similar for all strontium ferrites and has a temperatureactivated??character, varies in the range 0.005.0.05 cm2 V.1 s.1 indicative of small-polaron conduction mechanism

\\\\Expert2\\nbo\\Solid State Sciences\\2004, v.6, N 9, p.907.pdf
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10.
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   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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11.
Инвентарный номер: нет.
   
   Э 45


   
    Электрические свойства перовскитоподобной фазы CaCoCu2V4O12 при давлениях до 50 гпа = The electrical properties of the perovskite-like phase CaCoCu2V4O12 at pressures up to 50 GPa / Н. В. Мельникова, Н. И. Кадырова, А. В. Тебеньков, И. С. Устинова, Ю. Г. Зайнулин, А. Н. Бабушкин // Известия РАН. Серия физическая. - 2011. - Т. 75, № 8. - С. 1183-1185 : граф. - Библиогр.: с. 1185 (14 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФАЗЫ ПЕРОВСКИТОПОДОБНЫЕ -- СВОЙСТВА ЭЛЕКТРИЧЕСКИЕ -- ОКСИДЫ
Аннотация: Представлены результаты экспериментальных исследований влияния высоких давлений (10–50 ГПа) на электрические свойства и магнитосопротивление перовскитоподобной фазы высокого давления CaCoCu2V4O12. Установлены барические области существенных изменений в поведении электрических характеристик

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12.
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   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.
   
   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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14.
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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15.
Инвентарный номер: нет.
   
   H 65


   
    High-Pressure Defect Phase NdxCu3V4O / N. I. Kadyrova, Yu. G. Zainulin, V. L. Volkov, G. S. Zakharova, A. V. Korolev // Russian Journal of Inorganic Chemistry. - 2009. - Vol. 54, № 12. - P1872-1875 : il. - Bibliogr. : p. 1875 (9 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПЕРОВСКИТОПОДОБНЫЕ ОКСИДЫ -- ФАЗЫ ВЫСОКОГО ДАВЛЕНИЯ
Аннотация: A perovskite-like oxide NdxCu3V4O12(space group Im Z= 2,a= 7.278–7.322Å) with cationic vacancies was prepared for the first time under triaxial compression of p= 6.0–9.0 GPa at 0–1300° C. The compound has a metal-type conductivity, paramagnetic properties, and a phase transition

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16.
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   H 65


   
    High-Pressure Defect Phase CexCu3V4O12 / N. I. Kadyrova, Yu. G. Zainulin, V. L. Volkov, G. S. Zakharova, A. V. Korolev // Russian Journal of Inorganic Chemistry. - 2008. - Vol. 53, № 10. - P1542-1545 : il. - Bibliogr. : p. 1545 (5 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ -- ПЕРОВСКИТОПОДОБНЫЕ ОКСИДЫ
Аннотация: Nonstoichiometric perovskite oxide CexCu3V4O12(space group ImZ= 2,a=7.264–7.328 Å) with cationic vacancies was prepared barothermally. This compound has metal-type conductivity, paramagnetic properties, and a phase transition

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17.
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   H 65


   
    High-Pressure Defect Phase LaxCu3V4O12 / N. I. Kadyrova, Yu. G. Zainulin, V. L. Volkov, G. S. Zakharova, A. V. Korolev // Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 6. - P825-828 : il. - Bibliogr. : p. 828 (5 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ -- ПЕРОВСКИТОПОДОБНЫЕ ОКСИДЫ
Аннотация: Perovskite-like nonstoichiometric oxide LaxCu3V4O12(space group Im3, Z= 2, a= 7.313–7.354 Å) with cation-site vacancies has been prepared for the first time at high pressures (p= 6.0–8.0 GPa) and high temperatures (T= 700–1100°C). The compound has metal-type conductivity and paramagnetic properties, and undergoes a phase transition

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18.
Инвентарный номер: нет.
   
   A 58


    Animitsa, I. E.
    Structure and Electrical Properties of Oxygen-Deficient Strontium Copper Niobate / I. E. Animitsa, E. N. Dogodaeva, E. V. Zabolotskaya // Russian Journal of Inorganic Chemistry. - 2010. - Vol. 55, № 2. - P254-260 : il. - Bibliogr. : p. 260 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПРОТОННЫЙ ПЕРЕНОС -- НИОБАТЫ -- СТРОНЦИЙ
Аннотация: The transport properties of Sr5.66Cu0.14Nb2.20O11.30 double perovskite, which enters the homogeneity region of (Sr1 – yCuy)6 – 2xNb2 + 2xO11 + 3x solid solution, are concerned. The total conductivity is differentiated into terms over wide ranges of temperatures and oxygen partial pressure pO2 in dry and humid atmospheres. When pO2 is low or high, a test sample has dominant electron transport of n- or p-type, respectively. In air (pO2 = 0.21 atm), the p-type electron conductivity term increases with temperature elevation. In a humid atmosphere ( pH2O= 0.02 atm), a sample is capable of a reversible incorporation of water occlusion from the gas phase; as a result, some proton conductivity term appears and ion transference numbers increase over a wide range of pO2 values

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19.
Инвентарный номер: нет.
   
   N 21


   
    Nanostructured composite materials of cerium oxide and barium cerate / D. A. Medvedev, E. Yu. Pikalova , A. K. Demin , V. R. Khrustov , I. V. Nikolaenko , A. V. Nikonov, V. B. Malkov, B. D. Antonov // Russian Journal of Physical Chemistry A. - 2013. - Vol. 87, № 2. - С. 270-277
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЦЕРАТ БАРИЯ -- ОКСИД ЦЕРИЯ -- КОМПОЗИЦИОННЫЕ МАТЕРИАЛЫ -- НАНОРАЗМЕРНЫЕ ПОРОШКИ
Аннотация: Nanosized powders with a composition of (1-x)Ce0.8Sm0.2O2-δ-xBace0.8Sm0.2O3-δ (x = 0, 0.3, and 1) were obtained by self-ignition combustion synthesis (SICS) from the appropriate nitrates and various organic fuels (glycine, glycerol, citric acid, and a mixture of citric acid and ethylene glycol). The most finely dispersed powders formed when the concentration of the perovskite phase in the system decreased or when glycerol or citric acid-enthyleneglycol mixture was used as a fuel during SICS. A procedure for the preparation of powders and nanostructured ceramics was developed and their electric properties were studied.

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20.
Инвентарный номер: нет.
   
   H 99


   
    Hydration and Proton Transport in Solid Solutions Based on Ba2CaWO6 / I. E. Animitsa, N. A. Kochetova, T. A. Denisova, N. A. Zhuravlev, I. V. Baklanova // Russian Journal of Physical Chemistry A. - 2009. - Vol. 83, № 2. - P197-202 : il. - Bibliogr. : p. 201 (12 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ГИДРАТАЦИЯ -- ПРОТОННЫЙ ПЕРЕНОС -- ТВЕРДЫЕ РАСТВОРЫ -- ВОЛЬФРАМАТЫ ЩЕЛОЧНОЗЕМЕЛЬНЫХ МЕТАЛЛОВ
Аннотация: Hydrated alkaline-earth metal tungstates Ba4Ca2 +xW2 –xO12 – 2x with perovskite structure were studied by the thermogravimetry, 1H NMR, IR, and Raman spectroscopy methods. Electrical conductivity and transfer numbers were measured with varying T, Po2, and PH2O. The solid solutions are capable of reversibly intercalating water and can exhibit high-temperature proton transport. The localization of protons on oxygen results in the appearance of energetically nonequivalent OH groups; a small fraction of protons are present in the form of H2O and H3O+

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