Diffusion of the 65Zn radiotracer in ZnO polycrystalline ceramics.

dc.contributor.authorNogueira, Maria Auxiliadora das Neves
dc.contributor.authorFerraz, Wilmar Barbosa
dc.contributor.authorSabioni, Antônio Claret Soares
dc.date.accessioned2015-02-20T15:09:32Z
dc.date.available2015-02-20T15:09:32Z
dc.date.issued2003
dc.description.abstractZinc 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.pt_BR
dc.identifier.citationNOGUEIRA, 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.pt_BR
dc.identifier.doihttp://dx.doi.org/10.1590/S1516-14392003000200010
dc.identifier.issn1516-1439
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/4451
dc.language.isoen_USpt_BR
dc.rights.licenseO 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.pt_BR
dc.subjectZinc oxidept_BR
dc.subjectZinc diffusionpt_BR
dc.subjectGrain boundarypt_BR
dc.subjectVaristorpt_BR
dc.titleDiffusion of the 65Zn radiotracer in ZnO polycrystalline ceramics.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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