publication . Article . 2010

surface enhancement of oxygen exchange and diffusion in the ionic conductor la2mo2o9

Liu, J.; Chater, R. J.; Hagenhoff, B.; Morris, R. J. H. (Richard J. H.); Skinner, S. J.;
Open Access
  • Published: 17 Jun 2010 Journal: Solid State Ionics, volume 181, pages 812-818 (issn: 0167-2738, Copyright policy)
  • Publisher: Elsevier BV
  • Country: United Kingdom
Abstract
Isotopic surface oxygen exchange and its subsequent diffusion have been measured using secondary ion mass spectrometry in the fast ionic conductor La2Mo2O9. A silver coating was applied to the sample surface to enhance the surface exchange process for dry oxygen. Contrary to previous studies performed using a wet atmosphere, no grain boundary diffusion tail was observed under these optimized dry exchange conditions. The activation energy for oxygen diffusion was found to be 0.66(+/- 0.09) eV at high temperature (>570 degrees C), and 1.25(+/- 0.01)eV at low temperature (<570 degrees C). Time-of-Flight secondary ion mass spectrometry was employed to investigate th...
Subjects
free text keywords: General Materials Science, General Chemistry, Condensed Matter Physics, Grain boundary diffusion coefficient, Coating, engineering.material, engineering, Oxygen, chemistry.chemical_element, chemistry, Secondary ion mass spectrometry, Analytical chemistry, Atmosphere, Inorganic chemistry, Ionic bonding, Activation energy, Conductor, QD, QC
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