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A taxonomy of apatite frameworks for the crystal chemical design of fuel cell electrolytes

Lookup NU author(s): Dr Stevin Pramana

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Abstract

Apatite framework taxonomy succinctly rationalises the crystallographic modifications of this structural family as a function of chemical composition. Taking the neutral apatite [La8Sr2][(GeO4)6]O 2 as a prototype electrolyte, this classification scheme correctly predicted that 'excess' oxygen in La9SrGe6O26.5 is tenanted in the framework as [La9Sr][(GeO4)5.5(GeO5) 0.5]O2, rather than the presumptive tunnel location of [La9Sr][(GeO4)6]O2.5. The implication of this approach is that in addition to the three known apatite genera-A10(BO3)6X2, A10(BO4)6X2, A10(BO5)6X2-hybrid electrolytes of the types A10(BO3/BO4/BO5)6 X2 can be designed, with potentially superior low-temperature ion conduction, mediated by the introduction of oxygen to the framework reservoir. © 2008 Elsevier Inc. All rights reserved.


Publication metadata

Author(s): Pramana SS, Klooster WT, White TJ

Publication type: Article

Publication status: Published

Journal: Journal of Solid State Chemistry

Year: 2008

Volume: 181

Issue: 8

Pages: 1717-1722

Print publication date: 01/08/2008

Online publication date: 01/04/2008

ISSN (print): 0022-4596

ISSN (electronic): 1095-726X

Publisher: Academic Press

URL: https://doi.org/10.1016/j.jssc.2008.03.028

DOI: 10.1016/j.jssc.2008.03.028


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