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Featured researches published by A.S. Urusova.


Journal of Materials Chemistry | 2014

Tuning oxygen content and distribution by substitution at Co site in 112 YBaCo2O5+δ: impact on transport and thermal expansion properties

A.S. Urusova; V.A. Cherepanov; Oleg I. Lebedev; T.V. Aksenova; L.Ya. Gavrilova; V. Caignaert; B. Raveau

Polycrystalline “112” ordered oxygen deficient double perovskites YBaCo2−xMexO5+δ (Me = Fe, Cu, Ni) were synthesized by a glycerol-nitrate route with 0.0 ≤ x ≤ 0.7 for Me = Fe, 0.0 ≤ x ≤ 0.6 for Me = Cu and x = 0.1 for Me = Ni. The combined X-ray diffraction, electron microscopy and thermo-gravimetric studies show that all these oxides exhibit the ap × ap × 2ap tetragonal structure (S.G. P4/mmm); moreover, the oxygen content increases continuously with x in the iron-substituted oxide YBaCo2−xFexO5+δ, whereas the opposite is observed for the copper phase YBaCo2−xCuxO5+δ. This difference, which is due to the more electropositive character of Fe3+ compared to Cu2+, is hindered in the Ni2+ case due to its inability to accommodate the pyramidal coordination. The changes of the conductivity of these compounds versus temperature are closely related to their oxygen loss, in agreement with a defect structure model suggested earlier. Thermal expansion measurements prove the absence of phase transition in all oxides within the temperature range studied. The chemical compatibility of YBaCo1.4Fe0.6O5+δ with the electrolyte Ce0.8Sm0.2O2−δ is also demonstrated.


Russian Journal of General Chemistry | 2016

Specific features of phase equilibriums in Ln–Ba–Fe–O systems

Nadezhda E. Volkova; A.S. Urusova; L.Ya. Gavrilova; A.V. Bryuzgina; K. M. Deryabina; M. Yu. Mychinko; Oleg I. Lebedev; B. Raveau; V.A. Cherepanov

Formation of five-layered Ln2–εBa3+εFe5O15–δ phases [exhibiting nanoscale ordering with layer-by-layer location of the cations in the Ln–Ba–(Ln,Ba)–(Ln,Ba)–Ba–Ln perovskite-type structure] has occurred in the Ln–Ba–Fe–O (Ln = Y, Pr, Nd, Sm, Eu, and Gd) systems at 1100°С in air. Partial substitution of iron with cobalt (Ln2–εBa3+εFe5–yCoyO15–δ, Ln = Nd, Sm, Eu) has stabilized formation of the ordered structure. The oxygen content in the complex oxides has been determined in air over a wide temperature range by means of high-temperature thermogravimetry and iodometric titration. The change in oxygen content with temperature for the phases with five-layered ordering was significantly smaller than for the disordered phases.


Journal of Solid State Chemistry | 2013

Phase equilibria, crystal structure and oxygen content of intermediate phases in the Y–Ba–Co–O system

A.S. Urusova; V.A. Cherepanov; T.V. Aksenova; L.Ya. Gavrilova; E.A. Kiselev


Chimica Techno Acta. 2015. Vol. 2. № 4. | 2015

Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

V.A. Cherepanov; L.Ya. Gavrilova; Nadezhda E. Volkova; A.S. Urusova; T.V. Aksenova; E.A. Kiselev


Journal of Solid State Chemistry | 2017

Phase equilibria, crystal structure and properties of complex oxides in the Nd2O3–SrO–CoO system

T.V. Aksenova; T.G. Efimova; O.I. Lebedev; Sh.I. Elkalashy; A.S. Urusova; V.A. Cherepanov


Journal of Alloys and Compounds | 2014

Crystal structure, oxygen nonstoichiometry and thermal expansion of the layered NdBaCo2−xМxO5+δ (M = Ni, Cu)

T.V. Aksenova; A.S. Urusova; L.Ya. Gavrilova; V.A. Cherepanov


Journal of Solid State Chemistry | 2017

Phase equilibria, crystal structure, oxygen nonstoichiometry and thermal expansion of complex oxides in the Nd2O3 – SrO – Fe2O3 system

T.V. Aksenova; A.E. Vakhromeeva; Sh.I. Elkalashy; A.S. Urusova; V.A. Cherepanov


Journal of Alloys and Compounds | 2017

Phase equilibria in the Y–Ba–Fe–O system

A.S. Urusova; A.V. Bryuzgina; M. Yu. Mychinko; Natalia E. Mordvinova; Oleg I. Lebedev; V. Caignaert; E.A. Kiselev; T.V. Aksenova; V.A. Cherepanov


MRS Proceedings | 2012

Synthesis, structure and properties of LnBa(Co,Me) 2 O 5+δ (Ln = Nd, Sm, Ho and Y; Me = Fe, Ni, Cu) as potential cathodes for SOFCs

V.A. Cherepanov; Ludmila Ya. Gavrilova; Tatyana V. Aksenova; A.S. Urusova; Nadezhda E. Volkova


Solid State Ionics | 2018

Phase equilibria, structure and properties of complex oxides in the NdFeO3 − δ – SrFeO3 − δ – SrCoO3 − δ – NdCoO3 − δ system as potential cathodes for SOFCs

Sh.I. Elkalashy; A.R. Gilev; T.V. Aksenova; A.S. Urusova; V.A. Cherepanov

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E.A. Kiselev

Ural Federal University

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Oleg I. Lebedev

Centre national de la recherche scientifique

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Sh.I. Elkalashy

Nuclear Regulatory Commission

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B. Raveau

Centre national de la recherche scientifique

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