Opracowanie nanokrystalicznych proszków tlenkowych, mikrostruktura i nanochemia.

Ultra fine powders were prepared either by freeze-drying (VO2, Y2O3-doped ZrO2, CeO2) or by the alum process (550 and 1650 ppm by wt MgO-doped Al2O3). X-ray diffraction and transmission electron microscopy analysis reveal that the as-prepared particles were well crystallized after thermal decomposition of the precursor. The average crystallite size is a function of the calcination temperature and of the amount of dopant; MgO acting as a grain growth inhibitor of the alumina grains, due likely to the high segregation of Mg at the periphery of the grains shows by XPS analysis.