Effect of Y2O3 addition on the crystal growth and sintering behavior of YSZ nanopowders prepared by a sol-gel process

Chih Wei Kuo, Yun-Hwei Shen, I. Ming Hung, Shaw Bing Wen, Huey Er Lee, Moo Chin Wang

Research output: Contribution to journalReview article

34 Citations (Scopus)

Abstract

The effect of Y2O3 (8 mol% ≤ Y2O3 ≤ 10 mol%) addition on the crystal growth and sintering behavior 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. X-ray diffraction (XRD), Brunauer-Emmett-Teller specific surface area analyses (BET), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron diffraction (ED) and dilatometric analysis (DA) have been utilized to characterize the YSZ nanocrystallites. Characterization reveals that the YSZ nanopowders are weakly agglomerated. When calcined at various temperatures for 2 h, the crystallite size increases and the surface area of the YSZ powders decreases when the calcination temperature increased from 673 to 1273 K. A nanocrystallite size distribution between 10 and 15 nm is obtained in the TEM examination, which is consistent with the XRD investigation. The activation energy for crystal growth were determined as 5.75 ± 0.68, 4.22 ± 0.51, and 5.24 ± 0.20 kJ/mol for 8, 9 and 10 YSZ precipitates, respectively. The morphology of the YSZ sintered at high temperature indicates the abnormal growth is due to the low activation energy for crystallite growth. Crown

Original languageEnglish
Pages (from-to)186-193
Number of pages8
JournalJournal of Alloys and Compounds
Volume472
Issue number1-2
DOIs
Publication statusPublished - 2009 Mar 20

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Yttria stabilized zirconia
Crystallization
Crystal growth
Sol-gel process
Sintering
Nanocrystallites
Activation energy
Transmission electron microscopy
X ray diffraction
Temperature
Crystallite size
Electron diffraction
Specific surface area
Powders
Calcination
Precipitates
Ethanol
Scanning electron microscopy
Water

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Kuo, Chih Wei ; Shen, Yun-Hwei ; Hung, I. Ming ; Wen, Shaw Bing ; Lee, Huey Er ; Wang, Moo Chin. / Effect of Y2O3 addition on the crystal growth and sintering behavior of YSZ nanopowders prepared by a sol-gel process. In: Journal of Alloys and Compounds. 2009 ; Vol. 472, No. 1-2. pp. 186-193.
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Effect of Y2O3 addition on the crystal growth and sintering behavior of YSZ nanopowders prepared by a sol-gel process. / Kuo, Chih Wei; Shen, Yun-Hwei; Hung, I. Ming; Wen, Shaw Bing; Lee, Huey Er; Wang, Moo Chin.

In: Journal of Alloys and Compounds, Vol. 472, No. 1-2, 20.03.2009, p. 186-193.

Research output: Contribution to journalReview article

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T1 - Effect of Y2O3 addition on the crystal growth and sintering behavior of YSZ nanopowders prepared by a sol-gel process

AU - Kuo, Chih Wei

AU - Shen, Yun-Hwei

AU - Hung, I. Ming

AU - Wen, Shaw Bing

AU - Lee, Huey Er

AU - Wang, Moo Chin

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AB - The effect of Y2O3 (8 mol% ≤ Y2O3 ≤ 10 mol%) addition on the crystal growth and sintering behavior 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. X-ray diffraction (XRD), Brunauer-Emmett-Teller specific surface area analyses (BET), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron diffraction (ED) and dilatometric analysis (DA) have been utilized to characterize the YSZ nanocrystallites. Characterization reveals that the YSZ nanopowders are weakly agglomerated. When calcined at various temperatures for 2 h, the crystallite size increases and the surface area of the YSZ powders decreases when the calcination temperature increased from 673 to 1273 K. A nanocrystallite size distribution between 10 and 15 nm is obtained in the TEM examination, which is consistent with the XRD investigation. The activation energy for crystal growth were determined as 5.75 ± 0.68, 4.22 ± 0.51, and 5.24 ± 0.20 kJ/mol for 8, 9 and 10 YSZ precipitates, respectively. The morphology of the YSZ sintered at high temperature indicates the abnormal growth is due to the low activation energy for crystallite growth. Crown

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