Yeltsin Federal University

Yekaterinburg, Russia

Yeltsin Federal University

Yekaterinburg, Russia

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Kalinina E.G.,Ural Federal University | Lyutyagina N.A.,Yeltsin Federal University | Safronov A.P.,Yeltsin Federal University | Buyanova E.S.,Yeltsin Federal University
Inorganic Materials | Year: 2014

La0.7Sr0.3MnO3-δ (LSM) cathode materials have been prepared through pyrolysis of liquid precursors and by solid-state reaction. We examined the effect of the cathode material synthesis procedure on the growth of thin films of a solid electrolyte based on Y 2O3-stabilized ZrO2 (YSZ) nanopowder with an average geometric size of 10.9 nm on a dense surface of model cathodes by electrophoretic deposition. Using electron microscopy, BET surface area measurements, X-ray diffraction, thermal analysis, and dilatometry, we investigated the structure, specific surface area, phase composition, thermal properties, and sintering-induced volume changes of cathode materials differing in prior history. The results demonstrate that the starting cathode materials differed markedly in properties, but the cathodes produced by sintering them were identical in phase composition: they consisted entirely of a rhombohedral phase. The room-temperature electrical conductivity of the cathodes produced by solid-state reaction was 0.231 ± 0.01 S/cm, exceeding that of the cathodes produced through pyrolysis by an order of magnitude. © 2014 Pleiades Publishing, Ltd.


Slobodin B.V.,RAS Institute of Solid State Chemistry | Ishchenko A.V.,Yeltsin Federal University | Samigullina R.F.,RAS Institute of Solid State Chemistry | Teslenko O.S.,Yeltsin Federal University | And 2 more authors.
Inorganic Materials | Year: 2011

RbVO 3, CsVO 3, and Rb 0.5Cs 0.5VO 3 have been synthesized by the Pechini process. The vanadates have an orthorhombic structure (sp. gr. Pbcm), melt congruently in the range 650-530°C, and undergo a reversible phase transition in the range 520-340°C. We have determined the onset temperatures and end points of the transformations at a temperature scan rate of 3°C/min and their enthalpies, and measured the photo-, roentgeno-, and cathodoluminescence and diffuse reflectance spectra of the vanadates. The luminescence spectra each are well fitted with three pseudo-Voigt functions. CsVO 3 has the highest integrated emission intensity. The emission intensity of the Rb 0.5Cs 0.5VO 3 solid solution is lower than that of the simple vanadates because of the optical absorption around its intrinsic luminescence band. This may be due to the presence of stable vacancy-type structural defects in Rb 0.5Cs 0.5VO 3. © 2011 Pleiades Publishing, Ltd.


Slobodin B.V.,RAS Institute of Solid State Chemistry | Ishchenko A.V.,Yeltsin Federal University | Samigullina R.F.,RAS Institute of Solid State Chemistry | Yagodin V.V.,Yeltsin Federal University | Shul'Gin B.V.,Yeltsin Federal University
Inorganic Materials | Year: 2014

Four rubidium and cesium vanadates, with the compositions Rb 5V3O10, Rb3V5O 14, Cs5V3O10, and Cs 2V4O11, have been synthesized and identified, and their thermal stability ranges have been determined. Their spectroscopic properties and luminescence kinetics have been studied: we have measured their X-ray luminescence spectra at room temperature and liquid-nitrogen temperature, photoluminescence spectra, and photoluminescence excitation spectra. The spectra are compared to those of RbVO3 and CsVO3 - phosphors that have optimal properties among the alkali metal vanadates. © 2014 Pleiades Publishing, Ltd.


Kadyrova N.I.,RAS Institute of Solid State Chemistry | Mel'nikova N.V.,Yeltsin Federal University | Ustinova I.S.,Yeltsin Federal University | Zainulin Y.G.,RAS Institute of Solid State Chemistry
Inorganic Materials | Year: 2016

We have prepared ceramic CaCu3Ti4O12 samples by solid-state reaction and investigated the effect of high-pressure/high-temperature processing (p = 8.0 GPa, t = 1100°C) on the structure and electrical properties of CaCu3Ti4O12. © 2016, Pleiades Publishing, Ltd.


Petrovykh K.A.,RAS Institute of Solid State Chemistry | Rempel A.A.,RAS Institute of Solid State Chemistry | Kortov V.S.,Yeltsin Federal University | Valeeva A.A.,RAS Institute of Solid State Chemistry | Zvonarev S.V.,Yeltsin Federal University
Inorganic Materials | Year: 2013

Zn2SiO4:Mn (willemite) nanoparticles ∼30 nm in size have been prepared by disintegrating microcrystalline willemite powder in a planetary ball mill. X-ray diffraction and scanning electron micros-copy characterization showed that ball milling of the Zn2SiO 4:Mn powder for 60 min or a longer time ensured complete disintegration of the microcrystalline material and that the crystal structure of the resultant nanoparticles was identical to that of the parent powder. © 2013 Pleiades Publishing, Ltd.


Filonova E.A.,Yeltsin Federal University | Skutina L.S.,Yeltsin Federal University | Medvedev D.A.,RAS Institute of High Temperature Electrochemistry
Inorganic Materials | Year: 2016

Sr2-x Ba x NiMoO6 and Sr2Ni1-y Zn y MoO6 mixed oxides with a double perovskite structure have been synthesized by pyrolyzing polymer-salt materials. The phase composition and structure of the samples have been determined at 298 K. The effect of temperature on the crystal structure of Sr1.75Ba0.25NiMoO6, Ba2NiMoO6, and Sr2Ni1-y Zn y MoO6 has been studied for the first time. The linear thermal expansion coefficients of Sr1.75Ba0.25NiMoO6, Ba2NiMoO6, and Sr2Ni1-y Zn y MoO6 have been determined at temperatures from 298 to 1163 K in air. © 2016 Pleiades Publishing, Ltd.


Chikova O.A.,Yeltsin Federal University | Il'in V.Y.,Yeltsin Federal University | Tsepelev V.S.,Yeltsin Federal University | V'yukhin V.V.,Yeltsin Federal University
Inorganic Materials | Year: 2016

High-entropy melts in the Cu—Bi—Sn—In—Pb system have been studied by viscosity measurements during heating and subsequent cooling. The experimental data have been used to determine the temperatures at which microinhomogeneities in the melts irreversibly disappear. © 2016, Pleiades Publishing, Ltd.


Podkorytov A.L.,Yeltsin Federal University | Shtin S.A.,Yeltsin Federal University | Timofeev A.L.,Yeltsin Federal University | Yurovskaya N.L.,Yeltsin Federal University
Inorganic Materials | Year: 2015

This paper reports the solid-state synthesis, characterization, and physicochemical properties of zirconium-containing Ni4Nb2O9-based nickel niobates with the general formula Ni4-xZrx/2Nb2O9 (x = 0.05, 0.1, 0.15, 0.2). The materials have been identified by X-ray diffraction. We have determined the particle size composition of powder samples and the linear thermal expansion coefficients of the materials, assessed their chemical stability in acid media, and measured their electrical conductivity as a function of temperature. © Pleiades Publishing, Ltd., 2015.


Filonova E.A.,Yeltsin Federal University | Russkikh O.V.,Yeltsin Federal University | Dmitriev A.S.,Yeltsin Federal University
Inorganic Materials | Year: 2014

We have determined the extent of La1 - x Ba x Mn 1 - y Fe y O3 solid solutions with orthorhombically and rhombohedrally distorted perovskite structures. A partial phase diagram of the LaMnO3 + δ-BaMnO3-BaFeO 2.5-LaFeO3 system in air at a temperature of 1373 K has been proposed for the first time. We have measured the relative length change of La1 - x Ba x Mn1 - y Fe y O 3 samples and calculated their thermal expansion coefficients. © 2014 Pleiades Publishing, Ltd.


Filonova E.A.,Yeltsin Federal University | Dmitriev A.S.,Yeltsin Federal University
Inorganic Materials | Year: 2013

The crystal structure of the mixed oxide Sr2ZnMoO6 has been refined by powder neutron diffraction at 298 K. The temperature effect on the crystal structure of Sr2ZnMoO6 has been studied by X-ray diffraction. The oxide has been shown to undergo a phase transition at T = 670 K. The stability of Sr2ZnMoO6 in a reducing atmosphere has been assessed by thermogravimetry. The relative length change of Sr2ZnMoO6 has been determined by dilatometry in air in the temperature range 298-1273 K, and the linear thermal expansion coefficient of Sr2ZnMoO6 has been evaluated. The chemical compatibility of Sr2ZnMoO6 with Ce0.8Sm0.2O 2 - δ, Ce0.8Pr0.2O2 - δ, Zr0.85Y0.15O2 - δ, and La 0.88Sr0.12Ga0.82Mg0.18O 2.85 has been assessed. © 2013 Pleiades Publishing, Ltd.

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