Crystallization kinetics and growth mechanism of 8 mol% yttria-stabilized zirconia (8YSZ) nano-powders prepared by a sol-gel process

Chih Wei Kuo, Yueh Hsun Lee, I. Ming Hung, Moo Chin Wang, Shaw Bing Wen, Kuan Zong Fung, Chi Jen Shih

研究成果: Article同行評審

48 引文 斯高帕斯(Scopus)

摘要

Eight mol% yttria-stabilized zirconia (8YSZ) gel powders were synthesized at 348 K for 2 h using ZrOCl2·8H2O and Y(NO3)3·6H2O as starting materials in an ethanol-water solution by a sol-gel process. The crystallization kinetics and growth mechanism of the 8YSZ gel powders have been investigated using differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED). The XRD results and SAED pattern show that the 8YSZ gel powders calcined at 773 K for 2 h is a cubic ZrO2. The activation energy for the crystallization of the cubic ZrO2 formation in the 8YSZ gel powders is determined as 231.76 kJ/mol by a non-isothermal DTA method. Both growth morphology parameter (n) and crystallization mechanism index (m) are close to 3.0, indicating that the bulk nucleation is dominant in the cubic ZrO2 formation. The TEM examination shows that the cubic ZrO2 has a spherical-like morphology with a size ranging from 10 to 20 nm.

原文English
頁(從 - 到)470-475
頁數6
期刊Journal of Alloys and Compounds
453
發行號1-2
DOIs
出版狀態Published - 2008 4月 3

All Science Journal Classification (ASJC) codes

  • 材料力學
  • 機械工業
  • 金屬和合金
  • 材料化學

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