Oxygen permeation through Sr(Ln)CoO3− (Ln=La, Nd, Sm, Gd) ceramic membranes

Kovalevsky, Andrei V.; Хартон, В.В.; Tikhonovich, V.N.; Naumovich, E.N.; Tonoyan, A.A.; Reut, O. P.; Boginsky, L.S

doi:10.1016/s0921-5107(97)00292-4

Cited by 89 publications

(42 citation statements)

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“…The amount of charge carriers and thus the electrical conductivity and thermoelectric properties in this system can be tuned by suitable Cosite and La-site substitution [13][14][15][16][17][18][19][20][21][22]. There has been substantial recent interest in strontium-doped rare earth perovskites (Ln 1-x Sr x CoO 3-δ ) as cathode materials for solid oxide fuels cells [19,[23][24][25][26][27][28], as an ideal substrate for the deposition of lead zirconium titanate (PZT) films [29], and as high temperature ceramic membranes [30][31][32]. These phases also display novel magnetic behaviour, including glassiness and room temperature ferromagnetism [33][34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Sol-gel preparation and characterization of non-substituted and Sr-substituted lanthanum cobaltates

Cizauskaite

Kareiva

2008

Open Chemistry

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This paper reports on the results concerning the sol-gel preparation and characterization of Sr-substituted perovskite lanthanum cobaltates La 1-x Sr x CoO 3-d (x = 0.0, 0.25, 0.5 and 0.75). The metal ions, generated by dissolving starting materials in diluted acetic acid were complexed by 1,2-ethanediol to obtain the precursors for the non-substituted and Sr-substituted LaCoO 3 . The influence of the synthesis temperature, heating time and the amount of substituent on the phase purity of La 1-x Sr x CoO 3-d were investigated. The phase transformations, composition and micro-structural features in the gels and polycrystalline samples were studied by thermal analysis (TG/DTA), infrared spectroscopy (IR), powder X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). © Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Section: Introductionmentioning

confidence: 99%

Sol-gel preparation and characterization of non-substituted and Sr-substituted lanthanum cobaltates

Cizauskaite

Kareiva

2008

Open Chemistry

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“…The fractions of hydrogen and CO typically reach maxima at pO 2 close to 10 -20 atm and then decrease for more oxidising conditions, yielding CO 2 and H 2 O. These stability requirements are excessive for mixed conducting materials based on LaCoO 3 [3][4][5], (Fig.2). Other materials (e.g.…”

Section: Simulation Of Limiting Working Conditions In Membrane Reactorsmentioning

confidence: 99%

“…A relatively wide range of mixed conductors has been studied for these membrane reactors [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], including single phase and composite materials consisting of a metallic conductor and a good ionic conductor. This concept is widely discarded because these composite materials are either based on noble metals of prohibitive cost, or fail to meet the required stability (e.g.Ag/Bi(Er)O 1.5 ) or oxidation resistance conditions.…”

Section: Introductionmentioning

confidence: 99%

“…This concept is widely discarded because these composite materials are either based on noble metals of prohibitive cost, or fail to meet the required stability (e.g.Ag/Bi(Er)O 1.5 ) or oxidation resistance conditions. The emphasis has thus been on mixed conducting ceramics, mainly single phase [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], and occasionally 2-phase ceramic/ceramic composites [17]. Perovskite materials Sr 1-x La x CoO 3-δ [3][4][5] and Sr 1-x La x FeO 3-δ possess the highest permeability, limited stability, and excessive thermal and chemical expansion.…”

Section: Introductionmentioning

confidence: 99%

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Materiales conductores mixtos para la Oxidación Parcial de Hidrocarburos

Frade¹,

Хартон²,

Yaremchenko³

et al. 2004

Bol. Soc. Esp. Ceram. Vidr.

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Thermodynamic calculations with additional conditions for the conservation of carbon and hydrogen were used to predict the gas composition obtained by partial oxidation of methane as a function of oxygen partial pressure and temperature; this was used to assess the stability and oxygen permeability requirements of mixed conducting membrane materials proposed for this purpose. A re-examination of known mixed conductors shows that most materials with highest permeability still fail to fulfil the requirements of stability under reducing conditions. Other materials possess sufficient stability but their oxygen permeability is insufficient. Different approaches were thus used to attempt to overcome those limitations, including changes in composition in the A and B site positions of ABO 3 perovskites, and tests of materials with different structure types. Promising results were obtained mainly for some materials with perovskite or related K 2 NiF 4 -type structures. Limited stability of the most promising materials shows that one should rely mainly on kinetic limitations in the permeate side to protect the mixed conductor from severe reducing conditions. Materiales conductores mixtos para la Oxidación Parcial de HidrocarburosSe han usado cálculos termodinámicos con condiciones adicionales para la conservación del carbono e hidrógeno para predecir la composición del gas obtenido mediante la oxidación parcial del metano en función de la presión parcial de oxígeno y de la temperatura; esto se ha usado para asegurar los requerimientos de estabilidad y permeabilidad al oxígeno de los materiales conductores mixtos empleados como membrana para este propósito. Un nuevo exámen de los conductores mixtos conocidos muestra que la mayoría de los materiales con la mayor permeabilidad todavía fallan en el cumplimiento de los requerimientos de estabilidad bajo condiciones reductoras. Otros materiales poseen suficiente estabilidad, pero su permeabilidad al oxígeno es insuficiente. Por ello se han empleado diferentes aproximaciones para intentar superar esas limitaciones, incluyendo cambios en la composición en las posiciones A y B de de las perovsquitas ABO 3 , y pruebas con materiales con estructuras diferentes. Se han obtenido resultados prometedores principalmente en algunos materiales con estructura perovsquita o estructuras relacionadas con K 2 NiF 4 . La estabilidad limitada de los materiales más prometedores muestra que los estudios deben hacerse principalmente sobre las limitaciones cinéticas del lado permeable para proteger el conductor mixto en condiciones reductoras severas.

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“…An additional feature that results from the oxygen vacancies is the so-called mixed conductivity, which is a combination of high ionic conductivity and high electronic conductivity [2]. It opens possibilities for practical applications of these materials as high temperature ceramic membranes [3] and as cathode materials for solid oxide fuels [4].…”

Section: Introductionmentioning

confidence: 99%

Influence of Pressure on Magnetic Properties of La_1-xSr_xCoO_3-δ(x=0.5, 0.67, 1)

et al. 2006

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Influence of pressure on the phase transition temperature TC and on the spontaneous magnetisation M 0 of highly Sr substituted and oxygen nonstoichiometric La1−xSrxCoO 3−δ samples was investigated. An increase in TC and M 0 with pressure in investigated samples was found, indicating strengthening of ferromagnetic double exchange interactions, and the expansion of volume of ferromagnetic phase as a result of enhancement in ferromagnetic interactions in both cluster-glass and long range ferromagnetic states. We did not observe clear correlation between changes in pressure coefficient dT C /dP and changes in the formal oxidation state of the Co ion.

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Oxygen permeation through Sr(Ln)CoO3− (Ln=La, Nd, Sm, Gd) ceramic membranes

Cited by 89 publications

References 20 publications

Sol-gel preparation and characterization of non-substituted and Sr-substituted lanthanum cobaltates

Sol-gel preparation and characterization of non-substituted and Sr-substituted lanthanum cobaltates

Materiales conductores mixtos para la Oxidación Parcial de Hidrocarburos

Influence of Pressure on Magnetic Properties of La_1-xSr_xCoO_3-δ(x=0.5, 0.67, 1)

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Oxygen permeation through Sr(Ln)CoO3− (Ln=La, Nd, Sm, Gd) ceramic membranes

Cited by 89 publications

References 20 publications

Sol-gel preparation and characterization of non-substituted and Sr-substituted lanthanum cobaltates

Sol-gel preparation and characterization of non-substituted and Sr-substituted lanthanum cobaltates

Materiales conductores mixtos para la Oxidación Parcial de Hidrocarburos

Influence of Pressure on Magnetic Properties of La1-xSrxCoO3-δ(x=0.5, 0.67, 1)

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Influence of Pressure on Magnetic Properties of La_1-xSr_xCoO_3-δ(x=0.5, 0.67, 1)