Oxygen ion transport and electrode properties of La(Sr)MnO3

Хартон, В.В.; Николаев, А. В.; Naumovich, E.N.; Vecher, A.A.

doi:10.1016/0167-2738(95)00179-a

Cited by 46 publications

(27 citation statements)

References 3 publications

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“…Experimental procedures for the characterisation, including determination of the oxygen-ion transference numbers by the e.m.f. method, have been reported elsewhere (6,(9)(10)(11)(12)(13)(14). The spectroscopic analysis showed no deviations in the cation composition of the ceramics with respect to their chemical formulas within the experimental error limits; the total concentration of impurities was found to be less than 0.01 at%.…”

Section: Methodsmentioning

confidence: 94%

Propiedades de transporte de cerámicas Bicuvox dopadas

Yaremchenko¹,

Хартон²,

Mather³

et al. 1999

Bol. Soc. Esp. Ceram. Vidr.

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.5-δ a temperaturas superiores a 500K es ligeramente menor que la correspondiente a BICUVOX.10 no dopada, pero las propiedades de transporte en el rango de temperaturas 370-450K son similares. Dopando BICUVOX.10 con praseodimio produce la formaci-n de fases secundarias y la reducci-n de la conductividad y la expansi-n tŽrmica de las muestras cer ‡micas. El noemero de transporte del i-n sin ox'geno de fases con un contenido en tierra rara moderado como dopante (x ≤ 0.10) varia en el rango 0.90-0.99 a 780-910k y disminuye con el aumento de la temperatura. Los coeficientes de expansi-n tŽrmicos calculados a partir de los datos dilatomŽtricos para cer ‡micas

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Section: Methodsmentioning

confidence: 94%

Propiedades de transporte de cerámicas Bicuvox dopadas

Yaremchenko¹,

Хартон²,

Mather³

et al. 1999

Bol. Soc. Esp. Ceram. Vidr.

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“…The maximum ionic conductivity in ZrO 2 -based systems is observed when the content of acceptor-type dopant cations with the smallest radii (Sc, Yb, Y) is close to the minimum necessary to completely stabilize the cubic fluorite-type phase in the operating temperature range [9,11,16,[32][33][34][35]. This concentration (often referred to as the low stabilization limit) and the conductivity of the ceramic electrolytes are dependent, to a finite extent, on the pre-history and various microstructural features.…”

Section: Stabilized Zirconia Electrolytesmentioning

confidence: 99%

“…Taking into account the precursor costs, yttria-stabilized zirconia (YSZ) is among the most commonly used solid electrolytes to date. Numerous attempts have been made to identify new electrolyte compositions in ternary systems, particularly to increase the conductivity by optimizing the average size of dopant cations, to increase the stability of Sc-containing materials by co-doping, or to decrease the cost of Ln 3 þ -stabilized phases by mixing rare-and alkaline-earth dopants [33]. However, no worthwhile improvement has been observed.…”

Section: Stabilized Zirconia Electrolytesmentioning

confidence: 99%

Oxygen Ion‐Conducting Materials

Хартон

Marques

Kilner

et al. 2009

Solid State Electrochemistry I

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Oxygen ionic and mixed ionic-electronic conductors find important applications in solid-state electrochemical devices, including sensors, solid oxide fuel cells, hightemperature electrolyzers, and oxygen separation membranes. This chapter presents a brief overview of oxide phases with high diffusivity of O 2À anions, providing an introduction to this fascinating topic. Particular emphasis is centered on the comparative analysis of ionic and electronic conductivity variations in the major groups of solid oxide electrolytes and mixed conductors, such as perovskite-and fluorite-related compounds, apatite-type silicates, and derivatives of g-Bi 4 V 2 O 11 and b-La 2 Mo 2 O 9 . The defect chemistry mechanisms relevant to the oxygen ion migration processes are briefly discussed. IntroductionTechnologies based on the use of high-temperature electrochemical cells with oxygen anion-or mixed-conducting ceramics provide important advantages with respect to the conventional industrial processes [1][2][3][4][5][6][7][8]. In particular, solid oxide fuel cells (SOFCs) are considered as alternative electric power generation systems due to high energy-conversion efficiency, fuel flexibility, and environmental safety [1][2][3]. Dense ceramic membranes with mixed oxygen-ionic and electronic conductivity have an infinite theoretical separation factor with respect to oxygen, and can be used for gas separation and the partial oxidation of light hydrocarbons [4,5,7,8] (these and other applications are reviewed in Chapters 12 and 13). For all types of electrochemical cells, the key properties which determine the use of a material are the partial ionic and electronic conductivities. As an example, solid electrolytes for SOFCs, oxygen pumps and electrochemical sensors should exhibit a maximum oxygen ionic conductivity, while the electronic transport should be minimal. In contrast, for SOFC electrodes Solid State Electrochemistry I: Fundamentals, Materials and their Applications. Edited by Vladislav V. Kharton

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“…9 presents a comparison between data on oxygen vacancy diffusion coefficients of different perovskite-type oxides. At small dopant concentrations, the vacancy diffusion coefficient in the perovskites containing variable-valence cations decreases with doping, which is caused probably by strengthening of the B-O Coulombic interaction, due to the formation of M 4 § ions [30,31].…”

Section: Comments On Relationships Between Ionicmentioning

confidence: 98%

“…testing of gas tightness, are described elsewhere [7,8,[13][14][15][16][17][18][19][20][21]. Unless otherwise specified, all the properties relate to single-phase perovskite-type solid solutions.…”

Section: Experimental Descriptionmentioning

confidence: 99%

Ionic and electronic transport in perovskite-type La(Ga,M)O3−δ (M=Mg, Cr, Fe, Co, Ni, Nb)

Хартон

Naumovich

Marques

1999

Ionics

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ometry, but is lower than for La(Ga,Mg)O3.~ and (La,Sr)GaO3+ Co-doping with Nb and Mg was found to result in decreasing ionic transport in La(Ga,Nb,Mg)O3_s due to blocking of oxygen sites by Nb 5+. Small additions of Fe to the B-site of L%9Sr01GaO3. ~ increase the ionic conductivity, whereas substitution of Cr for Ga has the opposite effect. Incorporation of transition metal cations into the Ga site leads to a higher p-type electronic conductivity in all studied perovskites.

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Oxygen ion transport and electrode properties of La(Sr)MnO3

Cited by 46 publications

References 3 publications

Propiedades de transporte de cerámicas Bicuvox dopadas

Propiedades de transporte de cerámicas Bicuvox dopadas

Oxygen Ion‐Conducting Materials

Ionic and electronic transport in perovskite-type La(Ga,M)O3−δ (M=Mg, Cr, Fe, Co, Ni, Nb)

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