Oxygen Permeability of Strontium-Doped LaCoO<sub>3-δ</sub>Perovskites

Doorn, R.H.E. van; Kruidhof, H.; Bouwmeester, Henny J.M.; Burggraaf, A.J.

doi:10.1557/proc-369-377

Cited by 11 publications

(6 citation statements)

References 12 publications

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“…Rod shaped samples with composition x = 0.7 were made by thermal decomposition of metal-EDTA complexes followed by calcination at 900°C shaping, sintering and machining as described elsewhere [20]. The density of these rods was determined by the Archimedes method using mercury, and was found to be larger than 94% of the theoretical value.…”

Section: Methodsmentioning

confidence: 99%

Surface oxygen exchange of LaSrCoO

et al. 1997

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The surface oxygen exchange of Lao.3Sro,, Co0,_6 has been studied by 'SO/'hO exchange followed by dynamic SIMS analysis in the temperature region 700-900°C at a po, of 2.1 X lo4 Pa. The activation energy for the surface exchange rate (k) is 283 kJ mol -' and for the oxygen tracer diffusion coefficient (D *) 56t4 kJ mol-' The absolute values for both k and D * are among the highest known in the literature. The characteristic thickness at a po, of 2.1 X lo4 Pa is calculated to lie in the range 0.70 to 1.3 mm and is a function of temperature. The latter reflects the different activation energies for k and D*. The surface oxygen exchange coefficient is proportional to p& with n =0.41 to.02 at WYC, which has been explained by a rate determining step involving an adsorbed oxygen species and an oxygen vacancy. No oxygen pressure dependence for the tracer diffusion coefficient was observed at this temperature.

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Section: Methodsmentioning

confidence: 99%

Surface oxygen exchange of LaSrCoO

et al. 1997

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“…The exact structure of La 1 _ jr Sr J .Co0 3 _ < ; compounds is dependent on the oxygen non-stoichiometry (S) and is reported to be rhombohedral or cubic. Recently, these materials have received wide attention due to their potential applications as oxygen separation membranes, electrode materials for solid oxide fuel cells, as catalysts, gas sensors (van Doom et al, 1994), (Ohno et al, 1983).…”

Section: Strontiummentioning

confidence: 99%

About the crystal structure of La_1−xSr_xCoO_3−δ (0≤x≤0.6)

et al. 1996

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The crystal structure of La1−xSrxCoO3−δ (0≤x≤0.6) has been studied, using powder X-Ray diffraction. The crystal structure shows a transition from rhombohedral distorted perovskite for LaCoO3−δ into cubic perovskite for La0.4Sr0.6CoO3−δ. The cubic unit cell parameter is ac=3.8342(1) Å for La0.4Sr0.6CoO3−δ, the space group probably being Pm3m. Using a hexagonal setting, the cell parameters for La0.5Sr0.5CoO3−δ, are a=5.4300(3) Å, c=13.2516(10) Å; a=5.4375(1) Å, c=13.2313(4) Å for La0.6Sr0.4CoO3−δ; a=5.4437(1) Å, c=13.2085(5) Å for La0.7Sr0.3CoO3−δ; a=5.4497(2) Å, c=13.1781(6) Å for La0.8Sr0.2CoO3−δ and a=5.4445(2) Å, c=13.0936(6) Å for LaCoO3−δ with the space group probably being R3c.

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“…Rare earth element (REE) and strontium cobaltites with perovskite-like structures are promising materi als for solid oxide fuel cells [1][2][3] and oxygen membranes [4,5] owing to their high electronic and oxygen ionic conductivity and high electrochemical activity. Harnessing of cobaltites in electrochemical cells with solid electrolytes based on bismuth oxide seems to hold great promise since the thermal expansion coefficients of the given materials are sufficiently close [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Formation and properties of reaction layers of cobaltite electrodes on bismuth oxide electrolytes

Хартон¹,

Naumovich²,

Самохвал³

1997

Solid State Ionics

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Interaction o f electrodes consisting o f perovskite-like rare earth elem ents (R EE) and strontium cobaltites with Bio.7 5 Yo.25Oj 5 solid electrolyte has been studied. Formation o f solid solutions L a ,_ t _ vS r ,B ivC o 0 1_ A (jc = 0 -0 .5 ; y = 0 -0 .1 ) as w ell as ( B i , _ tC or) , _ vY vO , 5 (* = 0 -0 .4 ; >' = 0 -0 .2 5 ) can occur in the diffusion layer betw een cobaltite electrodes and B i20 3-based solid electrolytes. The crystal structure, electrical conductivity and oxygen perm eability o f these solid solutions have been investigated. It has been found that the values o f the conductivity and oxygen permeability o f L a(Sr,B i)C o(), л solid solutions decrease with increasing bismuth content. The results o f the investigation o f polarization resistance o f oxide electrodes in contact with B i0 7 5 Y H2 5 O , 5 solid electrolyte are presented.

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Oxygen Permeability of Strontium-Doped LaCoO_3-δPerovskites

Cited by 11 publications

References 12 publications

Surface oxygen exchange of LaSrCoO

Surface oxygen exchange of LaSrCoO

About the crystal structure of La_1−xSr_xCoO_3−δ (0≤x≤0.6)

Formation and properties of reaction layers of cobaltite electrodes on bismuth oxide electrolytes

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Oxygen Permeability of Strontium-Doped LaCoO3-δPerovskites

Cited by 11 publications

References 12 publications

Surface oxygen exchange of LaSrCoO

Surface oxygen exchange of LaSrCoO

About the crystal structure of La1−xSrxCoO3−δ (0≤x≤0.6)

Formation and properties of reaction layers of cobaltite electrodes on bismuth oxide electrolytes

Contact Info

Product

Resources

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Oxygen Permeability of Strontium-Doped LaCoO_3-δPerovskites

About the crystal structure of La_1−xSr_xCoO_3−δ (0≤x≤0.6)