Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

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Diffusion Processes in the Sintering of Zirconia-Based Nanomaterials

Melikhova, O.; Cizek, J.; Prochazka, I.; Anwand, W.; Konstantinova, T.; Danilenko, I.


In the present work, zirconia-based nanomaterials with various stabilizers were prepared by a co-precipitation technique. Defects in these nanomaterials were characterized by positron annihilation spectroscopy which is a non-destructive technique with a high sensitivity to open volume defects and atomic scale resolution. It was found that zirconia-based nanomaterials contain vacancies and also nano-scale and meso-scale pores. Diffusion processes which occur in the nanomaterials sintered at elevated temperatures were investigated by depth sensitive positron annihilation studies on a variable energy slow positron beam. It was found that sintering causes intensive grain growth and residual porosity is removed from samples by diffusion to the surface.

Keywords: Yttria-stabilised zirconia; nanopowders; sintering; porosity; positron annihilation

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