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Lookup NU author(s): Dr Stevin Pramana
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High oxygen content apatite germanates, La10Ge 6-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 La10Ge 5.5W0.5O27.5 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. © 2011 The Royal Society of Chemistry.
Author(s): Orera A, Baikie T, Kendrick E, Shin JF, Pramana S, Smith R, White TJ, Sanjuan ML, Slater PR
Publication type: Article
Publication status: Published
Journal: Dalton Transactions
Print publication date: 21/04/2011
Online publication date: 30/09/2010
ISSN (print): 1477-9226
ISSN (electronic): 1477-9234
Publisher: Royal Society of Chemistry
PubMed id: 20886149
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