The production of ceramic nano particles in stirred media mills is, due to high grinding media wear and therewith a product contamination as well as high energy requirement and long grinding times not very suitable at the moment. New high-power-density mills and a special modification of the process lead to better economical values for this kind of process. Here different mill geometries were investigated and compared with a classical stirred media mill with discs. Due to higher energy densities in the grinding chamber these high-power-density mills are very suitable for grinding in the nanometer and submicron range. The product contamination due to grinding media wear could not be improved by using different mill geometries. Besides the geometry the formulation of the suspension has a great effect on the grinding result. Therefore different potential determined ions were chosen for an electrostatic stabilisation. of the particles. The influences which were caused by the different mill geometries and the different stabilisators; were given in dependency of the productions costs. These costs were mainly influenced by the grinding media wear and energy costs. (C) 2007 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.