Enhancement of nanovoid formation in annealed amorphous Al 2O3 including W

R. Nakamura, M. Ishimaru, A. Hirata, K. Sato, M. Tane, H. Kimizuka, T. Shudo, T. J. Konno, H. Nakajima

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Abstract

The effect of W on the nanovoid formation in annealed amorphous Al 2O3 was studied by transmission electron microscopy and molecular dynamics simulations. A comparison of the void formation behavior in electron-beam deposited Al2O3 (without W) and resistance-heating deposited Al2O3 (with 10 at. W) revealed that W enhances the formation and growth of nanovoids. An analysis of the pair distribution function (PDF) in both types of amorphous Al 2O3 showed that the introduction of W into amorphous Al2O3 brings about a significant change in the amorphous structure. Furthermore, it was found by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) that sub-nm sized W clusters exist in as-deposited Al2O3 prepared by resistance-heating and then dissolve in the amorphous matrix with annealing. The combination of PDF analysis and HAADF-STEM observation provides evidence that the enhancement of void formation originates in the heterogeneous short-range atomic configurations induced by the addition of W.

Original languageEnglish
Article number064324
JournalJournal of Applied Physics
Volume110
Issue number6
DOIs
Publication statusPublished - 2011 Sep 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Nakamura, R., Ishimaru, M., Hirata, A., Sato, K., Tane, M., Kimizuka, H., Shudo, T., Konno, T. J., & Nakajima, H. (2011). Enhancement of nanovoid formation in annealed amorphous Al 2O3 including W. Journal of Applied Physics, 110(6), [064324]. https://doi.org/10.1063/1.3639290