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

The effect of Y2O3 addition 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 bee...

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Veröffentlicht in:Journal of non-crystalline solids 2005-02, Vol.351 (4), p.304-311
Hauptverfasser: Kuo, Chih-Wei, Lee, Yueh-Hsun, Fung, Kuan-Zong, Wang, Moo-Chin
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container_end_page 311
container_issue 4
container_start_page 304
container_title Journal of non-crystalline solids
container_volume 351
creator Kuo, Chih-Wei
Lee, Yueh-Hsun
Fung, Kuan-Zong
Wang, Moo-Chin
description The effect of Y2O3 addition 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 ZrO2 is obtained when added Y2O3 is greater than 8mol%. A nanocrystallite size distribution between 10 and 20nm is obtained in TEM observations.
doi_str_mv 10.1016/j.jnoncrysol.2004.11.002
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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 ZrO2 is obtained when added Y2O3 is greater than 8mol%. 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title Effect of Y2O3 addition on the phase transition and growth of YSZ nanocrystallites prepared by a sol–gel process
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