The aim of this work is to elaborate nanostructured cerium dioxides for catalytic and gas sensor applications. Nanosized cerium oxide powders were prepared via three chemical routes: 1) chemical precipitation followed by high-energy mechanical milling; 2) soft chemical preparation, 3) an unusual method of pulverization of liquid solution developed in our laboratory. The obtained powders were characterized using X-Ray diffraction analyses and Transmission Electron Microscopy experiments. Nanoparticles of pure CeO2 oxide having their sizes ranging from 2 to 10 nanometers have been obtained.
The formation, growth and sedimentation of intermetallic phase is one of the methods used to produce from scrap - commercial purity aluminium alloys. The formula of the sedimented phase was established basing on the chemical composition determined by the x-ray microprobe analysis of the sedimented particles. Until now the quarternary Al-Fe-Mn-Si equilibrium phase diagram is not known. The structure of this phase was studied using the X-ray powder diffraction technique and electron diffraction on thin foils using TEM. Both methods confirmed that the structure of the Al7(Fe,Mn)2Si phase has a cubic lattice with a parameter ao=12.56 A and 144 atoms per unit cell and belongs to the Im3 space group. The formation of this structure was confirmed in alloys with a chemical composition similar to the studied intemetallic phase.
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