Cobalt Doping as the Controlling Factor of Oxygen Diffusivity in ZnO by More than Four Orders of Magnitude

Abstract:

Oxygen diffusivity in ZnO ceramics doped with cobalt was investigated using an isotope tracer method. The oxygen isotope (¹⁸O) was introduced by ¹⁸O/¹⁶O exchange annealing in an ¹⁸O₂ atmosphere, and the depth profile of the ¹⁸O concentration was analyzed by secondary ion mass spectrometry. The results show that oxygen diffusivity in ZnO steeply increases with increasing Co concentration. In fact, the bulk oxygen diffusivity in 15 mol% Co-doped ZnO was four orders of magnitude greater than that of nominally non-doped ZnO. Oxygen diffusivity at grain boundaries was also enhanced by Co-doping.

• Periodical: Defect and Diffusion Forum (Volume 363)
• Pages: 85-90
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.363.85
• Online since: May 2015
• Authors: Minako Hashiguchi*, Isao Sakaguchi, Reona Miyazaki, Kazunori Takada, Naoki Ohashi
• Keywords: Cobalt Oxide, Oxygen Tracer Diffusion, Zinc Oxide

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