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Journal of Nanomaterials
Volume 2012, Article ID 469143, 7 pages
http://dx.doi.org/10.1155/2012/469143
Research Article

Top-Down Processing of N a N b O 3 Nanopowder

1Electronic Ceramics Department, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
2Centre of Excellence NAMASTE, Jamova cesta 39, 1000 Ljubljana, Slovenia

Received 23 February 2012; Accepted 5 April 2012

Academic Editor: Sergio J. Mejía-Rosales

Copyright © 2012 Jurij Koruza et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We report the processing of NaNbO3 nanopowder by combining the solid-state synthesis and subsequent milling in the agitator bead mill. The effect of different rotation speeds of the agitator shaft on the comminution process was followed by laser granulometry. The morphology and specific surface area of the powders were investigated by scanning electron microscopy and the N2 adsorption method, respectively. With the optimized milling parameters, we obtained NaNbO3 nanoparticles with an average size of 25 nm and a narrow particle size distribution. The result is comparable to other processing techniques, such as solution-based chemical routes or mechanochemical synthesis; however, the presented method does not require any complicated processing and it can be easily upscaled to yield large quantities of the NaNbO3 nanopowder. Furthermore, the compaction behaviour of the obtained nanopowder was investigated, and a compaction-response diagram was constructed revealing good compactability of the powder. The green compacts, isostatically pressed at 740 MPa, had a relative density of 70% and a narrow pore size distribution with an average pore radius of 4 nm.