ChemInform Abstract: OXYGEN PERMEABILITY OF STABILIZED ZIRCONIA SOLID ELECTROLYTES

Pal'guev, S.F.; Gil’derman, V. K.; Neujmin, A. D.

doi:10.1002/chin.197535014

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“…[2]. The expected 1/4 power oxygen pressure dependence of the permeability was observed by Smith et al (7), Fisher (9), Palguev et al (11), and Iwase et al (12). An exponent of 1/3 was reported by Heyne and Beekmans (3), who suggested that the observed deviation from 1/4 might be due to either a different incorporation mechanism for the electronic defects or to partial rate control by a surface reaction.…”

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confidence: 64%

“…7 at fixed P'o2 and variable thickness (T = 1230~ It is seen that the activation energies for bulk diffusion and for surface reaction are very similar. From the expression for/~, the following expression may be obtained (3,12,13) for the electronic conductivity o -~ at 1 atm 195 -+ 10 k J/tool in o -~ (~-Ucm-') = (10.9 _+ 3.4) - [11] RT The activation energy may be compared with the following values (in kilojoules per mole) from the literature: 217 (2), 183 (3), 233 (7), 232 (9), 263 (10), 155 (11), and 98 (12).…”

Section: Discussionmentioning

confidence: 99%

“…In spite of numerous studies (3,(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) there is no universal agreement on the general validity of Eq. [2].…”

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confidence: 98%

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Mechanism of Oxygen Permeation Through Lime‐Stabilized Zirconia

Dou

Masson

Pacey

1985

J. Electrochem. Soc.

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The isothermal permeation of oxygen through CaO-ZrO~ was studied at 960~176 and oxygen pressures P'o2 of 10 -:' to 1 atm on one side of the permeation cell and P"o~ of 10-~-10 -4 arm on the other. In the steady state, the permeating flux was directly proportional to (p,o.,n _ p,,o.,,,,), where n varied from 2.5 to 4.0. The value of n depended on the microstructure of the sample. For sample~ withou~ micropores, a value of n = 4 was found. These samples also contained a second phase whose composition depended on the nature and extent of impurities. For samples with nonconnected micropores, n varied from 3.6 to 2.5, depending on the thickness, and the results were consistent with a mechanism in which permeation is limited partly by diffusion within the solid and partly by a surface reaction. Both the bulk and surface processes have activation energies of about 200 kJ-mol-'.

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confidence: 64%