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Synthesis of hexagonal lanthanum germanate apatites through site selective isovalent doping with yttrium

Slater, Peter and Kendrick, Emma (2007) Synthesis of hexagonal lanthanum germanate apatites through site selective isovalent doping with yttrium Materials Research Bulletin, 43 (2008). ISSN 00255408

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Abstract

Apatite-type lanthanum silicates/germanates have been attracting considerable interest as a new class of oxide ion conductors, whose conductivity is mediated by oxide ion interstititials. For the germanates, it has been shown that, depending on composition, the cell can be either hexagonal or triclinic, with evidence for reduced low temperature conductivities for the latter, attributed to increased defect trapping in this lower symmetry cell. In this paper we show that site selective doping of Y into the triclinic apatite-type oxide ion conductors, La9.33+z(GeO4)6O2+3z/2 (0.33≤z≤0.67) results in a hexagonal lattice for the complete series with correspondingly enhanced low temperature conductivity.

Item Type: Article
Additional Information: E.K endrick, P.R. Slater; Mater. Res. Bull. 43 (2008) 2509
Uncontrolled Keywords: Oxides, Chemical Synthesis, X-ray diffraction, Ionic Conductivity, Apatite, Solid Oxide Fuel Cell
Divisions: Faculty of Engineering and Physical Sciences > Chemistry
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:43
Last Modified: 23 Sep 2013 18:34
URI: http://epubs.surrey.ac.uk/id/eprint/1673

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