Phase Stability Control of Interstitial Oxide Ion Conductivity in the La1+xSr1-xGa3O7+x/2 Melilite Family

Thomas, CI, Kuang, XJ, Deng, ZQ, Niu, HJ, Claridge, JB ORCID: 0000-0003-4849-6714 and Rosseinsky, MJ ORCID: 0000-0002-1910-2483 (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.

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)) thomas_chemistry_of_materials.pdf - Author Accepted Manuscript Download (752kB)

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:	## TULIP Type: Articles/Papers (Journal) ##
Uncontrolled Keywords:	FUEL-CELLS, ELECTRICAL-CONDUCTION, ELECTROLYTES, STRONTIUM, CERAMICS, BEHAVIOR, LAGAO3
Subjects:	?? QD ??
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	11 Nov 2011 13:54
Last Modified:	16 Dec 2022 04:36
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.
URI:	https://livrepository.liverpool.ac.uk/id/eprint/4473