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Apatite germanates doped with tungsten: synthesis, structure, and conductivity

Orera, A and Baikie, T and Kendrick, E and Shin, J. Felix and Pramana, S and Smith, R and White, T and Sanjuan, M.L. and Slater, Peter.R. (2011) Apatite germanates doped with tungsten: synthesis, structure, and conductivity. Dalton Transactions, 40. pp. 3903-3908.

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URL of Published Version: http://pubs.rsc.org/en/content/articlelanding/2011/dt/c0dt00690d

Identification Number/DOI: 10.1039/C0DT00690D

High oxygen content apatite germanates, La10Ge6-xWxO27+x, have been prepared by doping on the Ge site with W. In addition to increasing the oxygen content, this doping strategy is shown to result in stabilisation of the hexagonal lattice, and yield high conductivities. Structural studies of La10Ge5.5W0.5O27.5 show that the interstitial oxygen sites are associated to a different degree with the Ge/WO4 tetrahedra, leading to five coordinate Ge/W and significant disorder for the oxygen sites associated with these units. Raman spectroscopy studies suggest that in the case of the WO5 units, the interstitial oxygen is more tightly bonded and therefore not as mobile as in the case of the GeO5 units, thus not contributing significantly to the conduction process.

Type of Work:Article
Date:2011 (Publication)
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemistry
Keywords:solid oxide fuel cell; electrolyte; apatite; tungsten;
Subjects:QD Chemistry
Institution:University of Birmingham
Copyright Holders:Royal Society of Chemistry
ID Code:1153
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