Diffusion of the 65Zn radiotracer in ZnO polycrystalline ceramics

Materials Research. 2003;6(2):167-171 DOI 10.1590/S1516-14392003000200010

 

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Journal Title: Materials Research

ISSN: 1516-1439 (Print)

Publisher: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)

LCC Subject Category: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials

Country of publisher: Brazil

Language of fulltext: English

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AUTHORS

Maria Auxiliadora das Neves Nogueira
Wilmar Barbosa Ferraz
Antônio Claret Soares Sabioni

EDITORIAL INFORMATION

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Editorial Board

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Time From Submission to Publication: 36 weeks

 

Abstract | Full Text

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'delta (cm³/s) = 1.59×10-6 exp[(-2.44 ± 0.45) eV/kT], where D' is the grain-boundary diffusion coefficient and delta is the grain boundary width.