Oxygen nonstoichiometry and electrical conductivity of the solid solutions La2−xSrxNiOy (0≤x≤0.5)

Vashook, V.; Tolochko, S.P.; Yushkevich, I. I.; Makhnach, L. V.; Kononyuk, I.F.; Altenburg, H.; Hauck, J.; Ullmann, H.

doi:10.1016/s0167-2738(98)00134-9

Cited by 99 publications

(95 citation statements)

References 4 publications

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“…These differences do not seem to follow the same behavior for thin and thick layers, as for the 50 nm layers the conductivity is higher for the film deposited on STO substrate, while the contrary occurs for the 335 nm layers, a fact for which we do not have a clear explanation. Nevertheless, all the La 2 NiO 4+␦ films presented higher conductivity values than those published for bulk polycrystalline samples, 6,8,[30][31][32][33][34][35] and the maximum conductivity close to 330 S/cm was largely above the reported values to date for single-crystal samples along the a-b plane ͑maximum Ϸ 200 S/cm͒. 36 This fact seems to confirm the high quality of our samples.…”

Section: P29supporting

confidence: 82%

Electrical Conductivity and Oxygen Exchange Kinetics of La[sub 2]NiO[sub 4+δ] Thin Films Grown by Chemical Vapor Deposition

García

Burriel

Bonanos

et al. 2008

J. Electrochem. Soc.

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Epitaxial c-axis oriented La 2 NiO 4+␦ films were deposited onto SrTiO 3 and NdGaO 3 substrates by the pulsed injection metal organic chemical vapor deposition technique. Experimental conditions were optimized in order to accurately control the composition, thickness, and texture of the layers. X-ray diffraction was used to confirm the high crystalline quality of the obtained material. Electrical characterizations were performed on thin ͑50 nm͒ and thick ͑335 nm͒ layers. The total specific conductivity, which is predominantly electronic, was found to be larger for the thinner films measured ͑50 nm͒, probably due to the effect of the strain present in the layers. Those thin films ͑50 nm͒ showed values even larger than those observed for single crystals and, to our knowledge, are the largest conductivity values reported to date for the La 2 NiO 4+␦ material. The oxygen exchange kinetics was studied by the electrical conductivity relaxation technique, from which the surface exchange coefficient was determined.

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Section: P29supporting

confidence: 82%

Electrical Conductivity and Oxygen Exchange Kinetics of La[sub 2]NiO[sub 4+δ] Thin Films Grown by Chemical Vapor Deposition

García

Burriel

Bonanos

et al. 2008

J. Electrochem. Soc.

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“…[1][2][3][4][5][6][7] Because of their mixed conduction properties, Ln 2 NiO 4+¤ have attracted attention as cathode materials for solid oxide fuel cells (SOFCs). 8,9 Furthermore, the thermal expansion coefficients of Ln 2 NiO 4 -based materials are comparable to those of doped ceria and lanthanum gallate, which are well-known solid electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Local Structure and Oxide Ionic Diffusion of Nd2NiO4+^|^delta; with K2NiF4 Structure

et al. 2014

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The relationship between the local structure and oxide ionic conduction of Nd 2 NiO 4+δ possessing the K 2 NiF 4 structure was investigated. Various oxygen nonstoichiometry samples of Nd 2 NiO 4+δ prepared with different annealing oxygen partial pressures were examined. The local structure related to oxide ionic conduction was determined by the Nd K-edge extended X-ray absorption fine structure. The oxide ionic conductivity and surface exchange coefficient were estimated using electronic conductivity relaxation methods. The activation energy for the oxide ionic conductivity was found to have a direct correlation to the surface exchange coefficient. The bottleneck size for oxide ion conduction was strongly correlated to the oxide ionic conduction of interstitial oxygen and the oxygen surface exchange rate.

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“…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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Oxygen nonstoichiometry and electrical conductivity of the solid solutions La2−xSrxNiOy (0≤x≤0.5)

Cited by 99 publications

References 4 publications

Electrical Conductivity and Oxygen Exchange Kinetics of La[sub 2]NiO[sub 4+δ] Thin Films Grown by Chemical Vapor Deposition

Electrical Conductivity and Oxygen Exchange Kinetics of La[sub 2]NiO[sub 4+δ] Thin Films Grown by Chemical Vapor Deposition

Relationship between Local Structure and Oxide Ionic Diffusion of Nd2NiO4+^|^delta; with K2NiF4 Structure

Materiales conductores mixtos para la Oxidación Parcial de Hidrocarburos

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