Advanced Powder Technology, Vol.10, No.4, 383-397, 1999
Formation of ceria partially stabilized zirconia nanocrystals by laser evaporation-condensation
Sintered CeaO(2)-ZrO2 (1 : 9 molar ratio) targets were subject to CO2 laser ablation (1600 W for 8 s in ait) regarding alloying and phase transformation of the fluorite-type condensates for potential engineering applications. Analytical electron microscopy indicated the CeO2-ZrO2 solid solution condensates contain tetragonal precipitates in the cubic phase matrix and are generally spherical in shape. On the other hand, dendritic particles with curved vicinal {similar to 111} surfaces were also formed, due to the combined effects of Wulff shape, constitutional supercooling and cellular growth along < 110 >. The relatively large particles have a clear Si (impurity)-rich amorphous shell indicating a vapor-liquid-solid formation mechanism.
Keywords:SOLID-SOLUTIONS;ZRO2-CEO2 SYSTEM;GOLD CLUSTERS;TRANSFORMATION;TEMPERATURE;CATALYSTS;DIAGRAM;ZRO2;MIGRATION;REDUCTION