Πλοήγηση ανά Συγγραφέα "Medvedev, D."
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BaCeO3: Materials development, properties and application
Medvedev, D.; Murashkina, A.; Pikalova, E.; Demin, A.; Podias, A.; Tsiakaras, P. (2014)The characteristic of a number of oxide materials, which include BaCeO3-systems, is their ability to show the proton conductivity along with oxygen-ion conductivity. Such atypical behavior for other oxides attracts great ... -
Conductivity of Gd-doped BaCeO3 protonic conductor in H2-H2O-O2 atmospheres
Medvedev, D.; Murashkina, A.; Demin, A.; Tzorbatzoglou, F.; Tsiakaras, P. (2013)This work proposes a radically new simple method of evaluation of the proton conductivity based on measurement of the conductivity of ceramic materials depending on the oxygen partial pressure (pO2) at a gradual transition ... -
Cu and Gd co-doped BaCeO3 proton conductors: Experimental vs SEM image algorithmic-segmentation results
Ananyev, M.; Medvedev, D.; Gavrilyuk, A.; Mitri, S.; Demin, A.; Malkov, V.; Tsiakaras, P. (2014)Segmentation algorithms for the quantitative description of the surface microstructure and the evaluation of the grain-boundary conductivity of ceramic materials surface using SEM microphotographs analysis was developed ... -
The effect of cobalt oxide addition on the properties of gadolinium doped barium cerate
Maragou, V.; Medvedev, D.; Gorbova, E.; Demin, A.; Tsiakaras, P. (2009)In the present work the effect of cobalt oxide addition on the density and on the electrical properties of gadolinium doped barium cerate is investigated. A series of BaCe0.9-xGd0.1CoxO3-δ (?=0.00, 0.01, 0.03, 0.05, 0.07, ... -
Electrochemical properties of ceramic membranes based on SrTi0.5Fe0.5O3-delta in reduced atmosphere
Murashkina, A.; Maragou, V.; Medvedev, D.; Sergeeva, V.; Demin, A. K.; Tsiakaras, P. (2012)The present work aims at the investigation of the electrochemical properties of SrTi0.5Fe0.5O3-delta as a membrane material for hydrogen production via electrochemical reforming. The dependence of the electrical conductivity ... -
Hydrogen production aided by new (1-x) SrTi0.5Fe0.5O3-delta-xCe(0.8)(Sm0.8Sr0.2)(0.2)O2-delta(MIEC) composite membranes
Murashkina, A.; Pikalova, E.; Medvedev, D.; Demin, A.; Tsiakaras, P. (2014)In the present work, composite materials of the type (1-x)SrTi0.5Fe0.5O3-delta-xCe(0.8)(Sm0.8Sr0.2)(0.2)O2-delta (with x = 0, 0.25, 0.5, 0.75 and 1) are obtained by the two step solid state technique. Their transport ... -
Influence of Cu on the properties of gadolinium-doped barium cerate
Gorbova, E.; Maragou, V.; Medvedev, D.; Demin, A.; Tsiakaras, P. (2008)In the present work the effect of copper oxide addition on the densification behavior and electrical conductivity of BaCe1-xGdxO3-delta (BCG) type ceramics is investigated. Small addition (1 mol%) of this sintering additive ... -
Influence of sintering additives of transition metals on the properties of gadolinium-doped barium cerate
Gorbova, E.; Maragou, V.; Medvedev, D.; Demin, A.; Tsiakaras, P. (2008)In the present work the effect of MOx (where M =Cu, Ni, Zn, Fe, Co, Ti) addition on the densification behavior and electrical conductivity of BaCe(0.9)d(0.1)O(3-delta) ceramics is investigated. It was found that the small ... -
Insights on thermal and transport features of BaCe0.8-xZrxY0.2O3-delta proton-conducting materials
Lagaeva, J.; Medvedev, D.; Demin, A.; Tsiakaras, P. (2015)BaCe0.8-xZrxY0.2O3-delta-based materials (BCZYx, 0 <= x <= 0.8) are obtained through a modified citrate-nitrate combustion method at 1150 degrees C with following sintering at 1450 degrees C. Then their thermomechanical ... -
Investigation of the protonic conduction in Sm doped BaCeO3
Gorbova, E.; Maragou, V.; Medvedev, D.; Demin, A.; Tsiakaras, P. (2008)In the present work the structural and electrical properties of samarium-doped barium cerate perovskites of BaCe1-xSmxO3-delta formula (with x=0-0.2), prepared by following the solid state reaction method, are investigated. ... -
Investigation of the structural and electrical properties of Co-doped BaCe0.9Gd0.1O3-delta
Medvedev, D.; Maragou, V.; Zhuravleva, T.; Demin, A.; Gorbova, E.; Tsiakaras, P. (2011)In the present work the effect of cobalt oxide addition on the density and on the electrical properties of gadolinium-doped barium cerate is investigated. A series of BaCe0.9-xGd0.1CoxO3-delta (x = 0.00, 0.01, 0.03, 0.05, ... -
New mixed ionic-electronic composite materials based on SRTI0.5FE0.5O3-Δ and CE0.8(SM0.8SR0.2)0.2O2-Δ
Murashkina, A.; Pikalova, E.; Medvedev, D.; Demin, A.; Tzorbatzoglou, F.; Tsiakaras, P. (2013)The crystal, electrical and electrochemical properties of the new composite materials of (1-x)SrTi0.5Fe0.5O3-δ-xCe0.8(Sm0.8Sr0.2)0.2O2-δ (0≤x≤1, Δx= 0.25) prepared by solid phase method. Composites have no phase interaction. ... -
Novel composite solid state electrolytes on the base of BaCeO3 and CeO2 for intermediate temperature electrochemical devices
Medvedev, D.; Maragou, V.; Pikalova, E.; Demin, A.; Tsiakaras, P. (2013)In the present work, nano-sized powders of (1-x)Ce0.8Sm0.2O2-delta-xBaCe(0.8)Sm(0.2)O(3-delta) (x = 0, 0.3, 0.5, 0.7 and 1) were obtained by solution combustion synthesis (self-combustion synthesis, SCS) method of nitrate ... -
Polarization study of Fe|BaCe<inf>0.5</inf>Zr<inf>0.3</inf>Y<inf>0.08</inf>Yb<inf>0.08</inf>Cu<inf>0.04</inf>O<inf>3-δ</inf>|Fe electrochemical cells in wet H<inf>2</inf> atmosphere
Mitri, S.; Medvedev, D.; Kontou, S.; Gorbova, E.; Demin, A.; Tsiakaras, P. (2015)In the present work, the steady-state current-overpotential characteristics of the Fe|BaCe<inf>0.5</inf>Zr<inf>0.3</inf>Y<inf>0.08</inf>Yb<inf>0.08</inf>Cu<inf>0.04</inf>O<inf>3-δ</inf>|Fe interface as a function of the ... -
Single phase materials based on Co-doped SrTiO3 for mixed ionic-electronic conductors applications
Murashkina, A.; Maragou, V.; Medvedev, D.; Sergeeva, V.; Demin, A.; Tsiakaras, P. (2012)In the present work the effect of cobalt oxide addition on the structural and electrical properties of strontium titanate is examined. The SrTi1-xCoxO3-delta (0 <= x <= 0.4) samples were synthesized according to solid state ... -
Structural, thermomechanical and electrical properties of new (1-x) Ce0.8Nd0.2O2-delta-xBaCe(0.8)Nd(0.2)O(3-delta) composites
Medvedev, D.; Pikalova, E.; Demin, A.; Podias, A.; Korzun, I.; Antonov, B.; Tsiakaras, P. (2014)In this work composite (1-x)Ce0.8Nd0.2O2-delta-xBaCe(0.8)Nd(0.2)O(3-delta) ceramics were prepared via the one-step citrate-nitrate combustion procedure, and characterised by TG-DSC, XRD analysis, and SEM. Their transport ... -
Sulfur and carbon tolerance of BaCeO3-BaZrO3 proton-conducting materials
Medvedev, D.; Lyagaeva, J.; Plaksin, S.; Demin, A.; Tsiakaras, P. (2015)In the present work, BaCe0.8-xZrxY0.2O3-delta-based ceramic samples (BCZYx) are prepared and their chemical stability in corrosive atmospheres containing high concentrations of H2O, CO2 and H2S is investigated. Based on ... -
Textured BaCe(0.5)Zr(0.3)Ln(0.2)O(3-delta) (Ln = Yb, Y, Gd, Sm, Nd and La) ceramics obtained by the aid of solid-state reactive sintering method
Lyagaeva, J.; Medvedev, D.; Filonova, E.; Demin, A.; Tsiakaras, P. (2015)Dense BaCe(0.5)Zr(0.3)Ln(0.2)O(3-delta) (Ln = Yb, Y, Gd, Sm, Nd and La) proton-conducting ceramic materials are successfully prepared by solid-state reactive sintering method. The XRD analysis shows that the surface of ...