On the oxide ion conductivity of potassium doped strontium silicates

Ryan D. Bayliss; Stuart N. Cook; Sarah Fearn; John A. Kilner; Colin Greaves; Stephen J. Skinner

doi:10.1039/c4ee00734d

On the oxide ion conductivity of potassium doped strontium silicates

Ryan D. Bayliss^*, Stuart N. Cook, Sarah Fearn, John A. Kilner, Colin Greaves, Stephen J. Skinner

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

Recent reports of remarkably high oxygen ion conductivity in a new family of layered strontium silicates have questioned the rationale for materials design in solid electrolytes. Here, we present a re-investigation of the crystal structure, microstructure, total conductivity and perform the first direct investigation of oxygen ion diffusivity of a nominal Sr_0.8K _0.2Si_0.5Ge_0.5O_2.9 composition. The results show very low levels of oxide ion conductivity, which do not correlate with total electrical conductivity. Furthermore, sub-micron elemental mapping reveals a previously unreported inhomogeneous chemical composition. The absence of evidence for secondary phases in the diffraction data suggests that the additional phases are amorphous in nature.

Original language	English
Pages (from-to)	2999-3005
Number of pages	7
Journal	Energy & Environmental Science
Volume	7
Issue number	9
DOIs	https://doi.org/10.1039/c4ee00734d
Publication status	Published - 9 Jul 2014

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Environmental Chemistry
Pollution
Nuclear Energy and Engineering

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https://doi.org/10.1039/C4EE00734DLicence: None: All rights reserved

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title = "On the oxide ion conductivity of potassium doped strontium silicates",

abstract = "Recent reports of remarkably high oxygen ion conductivity in a new family of layered strontium silicates have questioned the rationale for materials design in solid electrolytes. Here, we present a re-investigation of the crystal structure, microstructure, total conductivity and perform the first direct investigation of oxygen ion diffusivity of a nominal Sr0.8K 0.2Si0.5Ge0.5O2.9 composition. The results show very low levels of oxide ion conductivity, which do not correlate with total electrical conductivity. Furthermore, sub-micron elemental mapping reveals a previously unreported inhomogeneous chemical composition. The absence of evidence for secondary phases in the diffraction data suggests that the additional phases are amorphous in nature. ",

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AU - Bayliss, Ryan D.

AU - Cook, Stuart N.

AU - Fearn, Sarah

AU - Kilner, John A.

AU - Greaves, Colin

AU - Skinner, Stephen J.

PY - 2014/7/9

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N2 - Recent reports of remarkably high oxygen ion conductivity in a new family of layered strontium silicates have questioned the rationale for materials design in solid electrolytes. Here, we present a re-investigation of the crystal structure, microstructure, total conductivity and perform the first direct investigation of oxygen ion diffusivity of a nominal Sr0.8K 0.2Si0.5Ge0.5O2.9 composition. The results show very low levels of oxide ion conductivity, which do not correlate with total electrical conductivity. Furthermore, sub-micron elemental mapping reveals a previously unreported inhomogeneous chemical composition. The absence of evidence for secondary phases in the diffraction data suggests that the additional phases are amorphous in nature.

AB - Recent reports of remarkably high oxygen ion conductivity in a new family of layered strontium silicates have questioned the rationale for materials design in solid electrolytes. Here, we present a re-investigation of the crystal structure, microstructure, total conductivity and perform the first direct investigation of oxygen ion diffusivity of a nominal Sr0.8K 0.2Si0.5Ge0.5O2.9 composition. The results show very low levels of oxide ion conductivity, which do not correlate with total electrical conductivity. Furthermore, sub-micron elemental mapping reveals a previously unreported inhomogeneous chemical composition. The absence of evidence for secondary phases in the diffraction data suggests that the additional phases are amorphous in nature.

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On the oxide ion conductivity of potassium doped strontium silicates

Abstract

ASJC Scopus subject areas

UN SDGs

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