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Title: Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes
Authors: Wei, Fengxia
Gasparyan, Hripsime
Keenan, Philip J.
Gutmann, Matthias
Fang, Yanan
Baikie, Tom
Claridge, John B.
Slater, Peter R.
Kloc, Christian Leo
White, Timothy John
Keywords: Structure-property relation
Anisotropic oxide ion conduction
Issue Date: 2015
Source: Wei, F., Gasparyan, H., Keenan, P. J., Gutmann, M., Fang, Y., Baikie, T., et al. (2015). Anisotropic oxide ion conduction in melilite intermediate temperature electrolytes. Journal of Materials Chemistry A, 3(6), 3091-3096.
Series/Report no.: Journal of Materials Chemistry A
Abstract: Electrolytes with oxide ion conductivities higher than 10−2 S cm−1 at moderate temperatures (∼500–900 °C) offer the possibility for solid oxide fuel cells to operate with less maintenance. This study of [A1+xB1−x]2[Ga]2[Ga2O7+x/2]2 (0 ≤ x ≤ 0.5) (A = La, Nd; B = Ca, Sr) layered-melilite found that in large single crystals intralayer oxide ion conduction is dominant. This anisotropic behavior arises by relaxation about the interstitial oxygen through changes in the interlayer A and Ga coordination, and at 850 °C conductivities are ∼0.008 S cm−1 along the c direction and ∼0.036 S cm−1 perpendicular to the c axis. It is found that the ionic conductivity can be optimized by increasing the number of interstitial oxygen and reducing the size of interlayer cations.
ISSN: 2050-7488
DOI: 10.1039/C4TA05132G
Rights: © 2015 The Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Materials Chemistry A, The Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
MSE Journal Articles

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