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Phase stability control of interstitial oxide ion conductivity in the La1+xSr1-xGa3O7+x/2 melilite family

Thomas, Chris I.; Kuang, Xiaojun; Deng, Zengqiang; Niu, Hongjun; Claridge, John B. and Rosseinsky, Matthew J. (2010) Phase stability control of interstitial oxide ion conductivity in the La1+xSr1-xGa3O7+x/2 melilite family. Chemistry of Materials, 22 (8). pp. 2510-2516. ISSN 1520-5002 (Online); 0897-4756 (Print)

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PDF (C.I. Thomas, X. Kuang, Z. Deng, H. Niu, J. B. Claridge and M. J. Rosseinsky*, Phase stability control of interstitial oxide ion conductivity in the La1+xSr1-xGa3O7+x/2 melilite family. Chemistry of Materials 22, 2510 (2010)) - Accepted Version
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Abstract

The two-dimensional polyhedral anion network melilites La1+xSr1-xGa3O7+0.5x exhibit interstitial oxide ion conductivity. The solid solution is shown to extend to x = 0.64 and the variation of the conductivity with x is investigated. At high temperatures all of these compounds adopt the typical tetragonal melilite structure. When x > 0.6, cooling below 600 °C results in a reversible phase transition to an orthorhombic structure which reduces the ionic conductivity. Quenching experiments have shown the tetragonal structure has a higher conductivity compared to the orthorhombic structure of the same composition. Short-range order effects associated with this transition exercise an important influence on the composition- and temperature-dependence of the conductivity.

Item Type:Article
Additional Information:Issue date: April 27, 2010. Published online: March 30, 2010. At time of publication Chris I. Thomas was at the University of Liverpool.
Uncontrolled Keywords:Ceramics; Fuel Cells; Oxide Ion Conduction; Structure-Property Relationships
Subjects:Q Science > QD Chemistry
Departments, Research Centres and Related Units:Academic Faculties, Institutes and Research Centres > Faculty of Science > Department of Chemistry
DOI:10.1021/cm903132w
Publisher's Statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/cm903132w.
Refereed:Yes
Status:Published
ID Code:4473
Deposited On:11 Nov 2011 13:54
Last Modified:21 Nov 2011 14:51

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