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Issue 15, 2011
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Apatite germanates doped with tungsten: synthesis, structure, and conductivity

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Abstract

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.

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

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Publication details

The article was received on 21 Jun 2010, accepted on 09 Aug 2010, published on 30 Sep 2010 and first published online on 30 Sep 2010


Article type: Paper
DOI: 10.1039/C0DT00690D
Citation: Dalton Trans., 2011,40, 3903-3908
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    Apatite germanates doped with tungsten: synthesis, structure, and conductivity

    A. Orera, T. Baikie, E. Kendrick, J. F. Shin, S. Pramana, R. Smith, T. J. White, M. L. Sanjuán and P. R. Slater, Dalton Trans., 2011, 40, 3903
    DOI: 10.1039/C0DT00690D

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