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Title: Oxygen diffusion in Bi2O3-doped ZnO
Title of periodic: Materials Research São Carlos
metadata.dc.title.subtitlejournal: Ibero-american Journal of Materials
Authors: Sabioni, Antônio Claret Soares
Daniel, Antônio Márcio J.M.
Ferraz, Wilmar Barbosa
Pais, Rafael Witter Dias
Huntz, Anne Marie
Jomard, François
Affiliation: Universidade Federal de Ouro Preto/UFOP, MG, Brasil
Universidade Federal de Ouro Preto/UFOP, MG, Brasil
Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil
Universidade Federal de Ouro Preto/UFOP, Belo Horizonte, MG, Brasil
Université Paris XI, Orsay, France
CNRS, Mendon, France
Issue Date: 2008
Keywords: Bismuth oxides;oxygen;diffusion;grain boundaries
Abstract: In order to clarify the influence of Bi-doping on oxygen diffusion in ZnO, the bulk and grain boundary oxygen diffusion coefficients were measured in Bi2O3-doped ZnO polycrystals by means of the gas-solid exchange method using the isotope 18O as the oxygen tracer. The experiments were performed on ZnO sintered samples containing 0.1, 0.3 and 0.5 mol
Bi2O3. The diffusion annealings were performed at 942, 1000 and 1092 ºC, in an Ar+18O2 atmosphere under an oxygen partial pressure of 0.2 atm. After the diffusion annealings, the 18O diffusion profiles were established by secondary ion mass spectrometry (SIMS). The results show an increase in the oxygen diffusion in the Bi2O3-doped ZnO, when compared to the oxygen diffusion in the undoped ZnO polycrystal under the same experimental conditions, both in bulk and in grain-boundaries. Moreover, it was observed that the higher the Bi2O3 concentration, the higher the oxygen diffusion. These results suggest that the incorporation of Bi2O3 increases the interstitial oxygen concentration which agrees with an interstitial diffusion mechanism both in bulk and in grain boundaries.
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