Oxygen diffusion in Bi2O3-doped ZnO

Materials Research

Antônio Claret Soares Sabioni²  Antônio Márcio J.m. Daniel²  Wilmar Barbosa Ferraz¹  Rafael Witter Dias Pais²  Anne-marie Huntz¹  François Jomard¹ 

[1] ,Universidade Federal de Ouro Preto Departamento de Física Laboratório de Difusão em MateriaisOuro Preto MG ,Brazil

关键词: oxygen diffusion;    Bi2O3-doped ZnO;    bulk diffusion;    grain boundary diffusion;   

DOI  :  10.1590/S1516-14392008000200019

来源: SciELO

【 摘 要 】

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 °C, 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.

【 授权许可】

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