Paper Titles
Experimental Errors in Studying the Defect Mobility in Nonstoichiometric Metal Oxides
p.139
Determination of the Stress Distribution at the Interface Metal-Oxide: Numerical and Theoretical Considerations
p.145
Kinetic Constraints in Diffusion
p.151
Random Walk Model of the Mechanical Relaxation
p.157
Zinc Self-Diffusion in ZnO
p.163
Diffusion of Confined Polymer Chains
p.169
On Vacancy Concentrations in Dilute FCC Alloys
p.175
Which is Larger, a Self-Interstitial or a Vacancy Activation Energy of Diffusion in Silicon?
p.181
Software for Simulation of Oxidation Processes
p.189

Zinc Self-Diffusion in ZnO

Article Preview

Abstract:

This work deals with the study of zinc self-diffusion in ZnO polycrystal of high density and of high purity. The diffusion experiments were performed using the 65Zn radioactive isotope as zinc tracer. A thin film of the tracer was deposited on the polished surface of the samples, and then the diffusion annealings were performed from 1006 to 1377oC, in oxygen atmosphere. After the diffusion treatment, the 65Zn diffusion profiles were established by means of the Residual Activity Method. From the zinc diffusion profiles were deduced the volume diffusion coefficient and the product dDgb for the grain-boundary diffusion, where d is the grain-boundary width and Dgb is the grain-boundary diffusion coefficient. The results obtained for the volume diffusion coefficient show good agreement with the most recent results obtained in ZnO single crystals using stable tracer and depth profiling by secondary ion mass spectrometry, while for the grain-boundary diffusion there is no data published by other authors for comparison with our results. The zinc grain-boundary diffusion coefficients are ca. 4 orders of magnitude greater than the volume diffusion coefficients, in the same experimental conditions, which means that grain-boundary is a fast path for zinc diffusion in polycrystalline ZnO.

You might also be interested in these eBooks
Diffusion in Materials - DIMAT2004 View Preview

Info:

Periodical:

Defect and Diffusion Forum (Volumes 237-240)

Pages:

163-168

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.237-240.163

Citation:

Cite this paper

Online since:

April 2005

Authors:

M.A.N. Nogueira, Antônio Claret Soares Sabioni, Wilmar Barbosa Ferraz

Keywords:

Grain Boundary, Radiotracer, Varistor, Zinc Oxide (ZnO), Zinc Self-Diffusion

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2005 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] T. K. Gupta and W. G. Carlson, J. Mater. Sci., vol. 20 (1985), p.3487.

Google Scholar

[2] H. L. Tuller, J. Electroceramics, vol. 4: S1 (1999), p.33.

Google Scholar

[3] K. S. Kim, Ph.D. thesis, Massachusetts Institute of Technology (1971).

Google Scholar

[4] W. J. Moore and E. L. William, Crystal Imperfections and Chemical Reactivity of Solids. ( The Faraday Society. Aberdeen 1959).

Google Scholar

[5] W. G. Tomlins, J. Appl. Phys., vol. 87, n1(2000), p.117.

Google Scholar

[6] J. Philibert, Atom Movements, Diffusion and Mass Transport in Solids. Les Editions de Physique (1991).

Google Scholar

[7] L. Badrour, E. G. Moya, J. Bernadini and F. Moya, J. Phys. Chem. Solids, vol. 50, n. 6 (1989), p.551.

Google Scholar

[8] L. G. Harrison, Transactions of Faraday Society, vol. 57 (1961), p.1191.

Google Scholar

[9] T. Suzuoka, J. Phys. Soc. Japan, vol 19 (1964), p.839.

Google Scholar

[10] A. Atkinson and R.I. Taylor, Phil. Mag. A, vol. 43(1981), p.979.

Google Scholar

[11] I. Kaur and W. Gust. Fundamentals of Grain and Interphase Boundary Diffusion. Ziegler Press, Stuttgart, 1988, 391p.

Google Scholar

[12] Wuensch, B. and Tuller, H.L. J. Phys. Solids vol. 55, No. 10 (1994) p.975.

Google Scholar

[13] Yanagida, H. et al. The Chemistry of Ceramics, Wiley, England, (1996).

Google Scholar

[14] A.C.S. Sabioni, Solid State Ionics, vol. 170, Issues1-2 (2004), p.145.

Google Scholar

[15] R.D. Shanon, Acta Crystallographica, A32 (1976), p.751.

Google Scholar