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 language | English |
|---|---|
| Pages (from-to) | 186-193 |
| Number of pages | 8 |
| Journal | Journal of Alloys and Compounds |
| Volume | 472 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 2009 Mar 20 |
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All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry
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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 journal › Review article
TY - JOUR
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
PY - 2009/3/20
Y1 - 2009/3/20
N2 - 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
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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UR - http://www.scopus.com/inward/citedby.url?scp=61349120715&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2008.05.027
DO - 10.1016/j.jallcom.2008.05.027
M3 - Review article
VL - 472
SP - 186
EP - 193
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - 1-2
ER -