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Issue 11, 2012
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Sr1−xKxSi1−yGeyO3−0.5x: a new family of superior oxide-ion conductors

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Abstract

Monoclinic SrMO3 (M = Si or Ge) contains (001) planes of M3O9 units of three corner shared MO4 coplanar complexes separated by close-packed planes of Sr2+ ions each coordinated, top and bottom, by three terminal oxygen on three different M3O9 units. Substitution of K+ for Sr2+ introduces terminal-oxygen vacancies that are either not accommodated by corner sharing with a neighboring M3O9 unit, apparently because of steric hindrance by the large Sr2+ and K+ ions, or are accommodated by a distortion that creates an interstitial mobile oxide ion. Stabilization of a terminal-oxygen vacancy in a tetrahedral anion complex by steric hindrance in Sr1−xKxSi1−yGeyO3−0.5x represents a new design principle for superior oxide-ion electrolytes at intermediate temperatures.

Graphical abstract: Sr1−xKxSi1−yGeyO3−0.5x: a new family of superior oxide-ion conductors

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Supplementary files

Article information


Submitted
25 Jul 2012
Accepted
30 Aug 2012
First published
03 Oct 2012

Energy Environ. Sci., 2012,5, 9626-9631
Article type
Paper

Sr1−xKxSi1−yGeyO3−0.5x: a new family of superior oxide-ion conductors

P. Singh and J. B. Goodenough, Energy Environ. Sci., 2012, 5, 9626
DOI: 10.1039/C2EE22978A

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