Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/4451
Title: Diffusion of the 65Zn radiotracer in ZnO polycrystalline ceramics.
Authors: Nogueira, Maria Auxiliadora das Neves
Ferraz, Wilmar Barbosa
Sabioni, Antônio Claret Soares
Keywords: Zinc oxide
Zinc diffusion
Grain boundary
Varistor
Issue Date: 2003
Citation: NOGUEIRA, M. A. das N.; FERRAZ, W. B.; SABIONI, A. C. S. Diffusion of the 65Zn radiotracer in ZnO polycrystalline ceramics. Materials Research, São Carlos, v. 6, n. 2, p. 167-171, 2003. Disponível em: <http://www.scielo.br/pdf/mr/v6n2/16019.pdf>. Acesso em: 13 fev. 2015.
Abstract: Zinc self-diffusion coefficients were measured in polycrystalline ZnO of high density (>99% of the theoretical density) and of high purity (> 99.999%). The diffusion experiments were performed from 1006 to 1377 °C, in oxygen atmosphere, for times between 16 and 574 h. The diffusion profiles were established by means of Residual Activity Method using the 65Zn radioactive isotope as zinc tracer. In our experimental conditions, the zinc volume diffusion coefficients can be described by the following Arrhenius relationship: D(cm2/s) = 1.57×10-3 exp[(-2.66 ± 0.26) eV/kT]. In the same experimental conditions, the grain-boundary diffusion coefficients are approximately 4 orders of magnitude greater than the volume diffusion coefficients, and can be described by the Arrhenius relation: D’δ (cm3/s) = 1.59×10-6 exp[(-2.44 ± 0.45) eV/kT], where D’ is the grain-boundary diffusion coefficient and δ is the grain boundary width.
URI: http://www.repositorio.ufop.br/handle/123456789/4451
metadata.dc.identifier.doi: http://dx.doi.org/10.1590/S1516-14392003000200010
ISSN: 1516-1439
metadata.dc.rights.license: O periódico Materials Research dá permissão ao RI/UFOP para depositar uma cópia eletrônica dos artigos publicados por esse periódico em que ao menos um dos autores é aluno ou professor da UFOP. Contato via email em 25 out. 2013.
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