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    STUDIA CHEMIA - Ediţia nr.4(II) din 2009  
         
  Articol:   PHYSICO-CHEMICAL CHARACTERIZATION OF 8YSZ NANOPARTICLES BY MODIFIED SOL-GEL METHOD.

Autori:  C. SUCIU, A. VIK, FIRUTA GOGA, E. DOROLTI, R. TETEAN, A.C. HOFFMANN. 		 
       
         
  Rezumat:  8 mol% Yttria Stabilized Zirconia (8YSZ) powders have been obtained by the modified sol-gel method using sucrose and pectin as organic precursors. The influence of the amounts of both sucrose and pectin were studied experimentally over a range of calcination temperatures. The obtained gels were investigated by Thermogravimetric/Differential Thermal Analysis (TG/DTA) to identify physico-chemical processes that take place during the process and to establish an optimal calcination temperature diagram. The final powders were investigated by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) to evaluate the phase composition, the microstructure and morphology. Crystallite size and particle size of the final powders were determined using Scherrer formula and nitrogen adsorption with the Brunauer–Emmett–Teller (BET) isotherm. The results confirm that the particle properties, size and crystallite size, are strongly dependent on the calcination temperature. On the other hand, the particle properties are rather—but not completely—insensitive to (and therefore the process rather “forgiving” for) variations in the amounts of sucrose or pectin used.

Keywords: YSZ, yttria stabilized zirconia, nanoparticles, sol-gel processing, calcination temperature, organic precursors, sucrose, pectin
  
         
     
         
         
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