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Issue 7, 2005
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Structural studies of apatite-type oxide ion conductors doped with cobalt

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Abstract

A series of Co doped lanthanum silicate apatite-type phases, La9.83Si4.5Co1.5O26, La9.66Si5CoO26, La10Si5CoO26.5 and La8BaCoSi6O26, have been synthesised, and neutron diffraction, EXAFS and XANES used to investigate their structures in detail. All compositions were shown to possess the hexagonal apatite structure, and the results confirmed that cobalt can be doped onto both the La and Si sites within the structure depending on the starting composition. The Co doping is shown to cause considerable local distortions within the apatite structure. In the case of Si site doping two compositions showed anisotropic peak broadening, which has been attributed to incommensurate ordering of oxygen within the apatite channels.

Graphical abstract: Structural studies of apatite-type oxide ion conductors doped with cobalt

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Article information


Submitted
20 Dec 2004
Accepted
17 Feb 2005
First published
04 Mar 2005

Dalton Trans., 2005, 1273-1280
Article type
Paper

Structural studies of apatite-type oxide ion conductors doped with cobalt

J. R. Tolchard, J. E. H. Sansom, M. S. Islam and P. R. Slater, Dalton Trans., 2005, 1273
DOI: 10.1039/B418992B

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