Synthesis of Ga-doped Ge-based apatites: effect of dopant and cell symmetry on oxide ion conductivity

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Abstract

Apatite-type rare earth silicates/germanates are attracting significant interest as a new class of oxide ion conductors. For the germailates, La9.33+x(GeO4)(6)O2+3x/2, it has been shown that, depending oil 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 the effect of Ga doping oil the cell symmetry and conductivity is reported, with the observation of triclinic cells across the series La-10(GeO4)(6-x)(GaO4)(x)O3-x/2. Through co-doping with Y on the La site, i.e. La8Y2(GeO4)(6-x)(GaO4)(x)O3-x/2, it is shown that hexagonal cells are obtained. and the dependence of the conductivity on oxygen content/Ga content is discussed. In particular it is shown that the stabilisation of the hexagonal cell through Y doping enhances the low temperature conductivity. (C) 2008 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)3627-3632
Number of pages6
JournalMaterials Research Bulletin
Volume43
Issue number12
Early online date3 Feb 2008
DOIs
Publication statusPublished - 1 Dec 2008

Keywords

  • Ionic conductivity
  • Chemical synthesis
  • X-ray diffraction
  • Oxides

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