An effective survey on the behavior of KTaO٣ nanopowder

The Main aim of this work is establishing a simple and effective processing route for the preparation of KTaO٣ nanopowder by combining conventional and well established ceramic processing techniques, such as the solid state synthesis of submicron sized powder [١-٩] and subsequent efficient milling to nano-range in an agitator bead mill. The influences of the milling time and different rotation speeds of the agitator shaft were followed by measurements of the particle size and size distribution and specific surface area. The optimization of the process resulted in a successful preparation of KTaO٣ nanopowder. Furthermore, the nanopowder was isostatically pressed between ٢٥٠ MPa and ٧٤٠ MPa and its compactionresponse diagram was constructed. In this research,We report the processing of KTaO٣ 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 N٢ adsorption method, respectively. With the optimized milling parameters we obtained KTaO٣ nanoparticles with an average size of ٢٥ 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 KTaO٣ 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 ٧٤٠ MPa, had a relative density of ٧٠ % and a narrow pore size distribution with an average pore radius of ٤ nm.