Effect of Y2O3 addition on the phase transition and growth of YSZ nanocrystallites prepared by a sol-gel process
Effect of Y2O3 addition on the phase transition and growth of YSZ nanocrystallites prepared by a sol-gel process
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DOI：
10.1016/j.jnoncrysol.2004.11.002
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发表时间：
2005-02
影响因子：
3.5
通讯作者：
Chih-Wei Kuo;Yueh-Hsun Lee;K. Fung;Moo-Chin Wang
中科院分区：
文献类型：
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作者：
Chih-Wei Kuo;Yueh-Hsun Lee;K. Fung;Moo-Chin Wang
The effect of Y2O3addition on the phase transition and growth of yttria-stabilized zirconia (YSZ) nanocrystallites prepared by a sol–gel process with various mixtures of ZrOCl2·8H2O and Y(NO3)3·6H2O ethanol–water solutions at low temperatures has been studied. DTA/TGA, XRD, SEM, TEM and ED have been utilized to characterize the YSZ nanocrystallites. The crystallization temperature of 3YSZ, in which Y2O3/(Y2O3+ZrO2)=0.03, gel powders estimated by DTA/TG is about 427°C. When 3YSZ and 5YSZ gels are calcined at 500–700°C, their crystal structures as composed of coexisting tetragonal and monoclinic ZrO2, and tetragonal phase decreases with calcination temperature increasing from 500 to 700°C. Pure cubic ZrO2is obtained when added Y2O3is greater than 8mol%. A nanocrystallite size distribution between 10 and 20nm is obtained in TEM observations.
