23. - 25. 10. 2012, Brno, Czech Republic, EU SYNTHESIS AND CONSOLIDATION OF OXIDE NANOPARTICLES Igor DANILENKO, Tetyana KONSTANTINOVA, Oksana GORBAN, Galina VOLKOVA, Valentina GLAZUNOVA, Sergei PROKHORENKO, Iryna BRYUKHANOVA Donetsk Institute for Physics and Engineering NAS of Ukraine, Ukraine, 83114, Donetsk, R.Luxemburg str., 72, matscidep@aim.com Abstract In this study we investigate the influence of precursor type, synthesis conditions and dopants concentration on phase composition, particle size and agglomeration degree of different oxide nanopowders, in particular: zirconia, zirconia composites, lanthanum manganite, ets. Also we try to find the influence of characteristics of these powders on consolidation. It was shown that the synthesis conditions have extremely influence on characteristics and structure of different types of oxide nanopowders. In case of zirconia the change of synthesis conditions lead to changing the particle size, agglomeration degree and particle surface properties. Consolidation of nanoparticles under high pressure conditions lead to martensitic phase transformations and this process has extremely depends from synthesis conditions. Zirconia nanopowders which are synthesized from nitrate salts are more stable to phase transition in comparison with powders obtained from chloride salts. For LSM materials we found the strong difference of particles morphology and magnetic properties according to starting material structure. It was found that formation of complex structure of precursor materials during drying and calcinations stage do not allow to obtain the nanoparticles. It was shown that the powders characteristics, what formed during synthesis, are inherited during consolidation process and in ceramics structure and properties. Keywords: oxide nanopowders, synthesis, powder structure, consolidation. 1. INTRODUCTION The processes of nanopowders obtaining, properties studies and nanostructured materials utilization lately are very popular in world science, because the properties of these materials promise the substantial change as compared to their conventional analogues [1]. The decreasing of particles size of initial powder from microns to nanosizes allowed not only to improve mechanical properties of ceramic materials but also to find out the change of their physical properties. However the obtaining of nanoparticles with sharp size distribution and the predetermined chemical composition is a complex task in connection with high agglomeration ability of nanoparticles. In most cases we have obtain ceramic powders with dispersion primary particles, which form the firmly linked aggregates are the second particles, which, in same queue, associate in hard or soft agglomerates. The calcinations lead to transform it to polycrystalline particles, with the small value of coherent scattering area and low value of specific surface area. At the same time for fundamental researches except for the requirement of particles connections in the system is very important have the nanoparticles samples with the set of sizes in a nanometric range [1]. There are many methods for the nanopowders obtaining were developed [2-5]. Each of that has own advantages and failings. One of the major disadvantages of most methods is the inheritance of structure of the precursor materials by the structure of the final powder. In this study we show the influence precursor structures not only on the powder characteristics and properties but on consolidation processes and physical properties of material. In this study we investigate two types of oxide materials: ZrO 2 -3mol%Y 2 O 3 and lanthanum manganite (La 0,7 Sr 0,3 MnO 3 ).