Abstract
The phase transformation and crystalline growth of 4 mol% yttria partially stabilized zirconia (4Y-PSZ) precursor powders have been investigated using the coprecipitation route, using zirconium oxide chloride octahydrate (ZrOCl2·8H2O) and yttrium nitrate (Y(NO3)3·6H2O) as the initial materials. Differential thermal analysis (DTA), X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), nano beam electron diffraction (NBED), and high resolution TEM (HRTEM) were utilized to characterize the behavior of phase transformation and crystalline growth of the 4Y-PSZ precursor powders after calcined. Tetragonal ZrO2 crystallization occurred at about 718.2 K. The activation energy of tetragonal ZrO2 crystallization was 227.0 ± 17.4 kJ/mol, obtained by a non-isothermal method. The growth morphology parameter (n) and growth mechanism index were close to 2.0, showing that tetragonal ZrO2 had a plate-like morphology. The crystalline size of tetragonal ZrO2 increased from 7.9 to 27.6 nm when the calcination temperature was increased from 973 to 1,273 K. The activation energies of tetragonal ZrO2 growth were 14.97 ± 0.33 and 84.46 ± 6.65 kJ/mol when precursor powders after calcined from 723–973 and 973–1,273 K, respectively.
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The authors gratefully acknowledge the financial support from the Ministry of Economic Affairs, Taiwan, Republic of China, under Grant 102-EC-17-A-08-S1-142. The authors and also deeply thank Prof. M.H. Hon and Mr. S.Y. Yau for offering valuable advice and suggestions on the experiments and analyses.
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Wang, CL., Hwang, WS., Chu, HL. et al. Phase transformation and crystalline growth of 4 mol% yttria partially stabilized zirconia. J Sol-Gel Sci Technol 70, 428–440 (2014). https://doi.org/10.1007/s10971-014-3303-y
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DOI: https://doi.org/10.1007/s10971-014-3303-y