Synthesis and Characterization of Yttria-Stabilized Zirconia Nanoparticles Doped with Ytterbium and Gadolinium: ZrO2 9.5Y2O3 5.6Yb2O3 5.2Gd2O3
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Defect cluster thermal barrier coatings (TBCs) are attractive alternatives to Yttria-stabilized zirconia (YSZ) in advanced applications. In this study, YSZ nanoparticles doped with ytterbium and gadolinium (ZrO2 9.5Y2O3 5.6Yb2O3 5.2Gd2O3 (ZGYbY)) were synthesized through a chemical co-precipitation and calcination method, and characterized by in situ high-temperature X-ray diffraction analysis in the temperature range of 25 °C to 1000 °C (HTK-XRD), thermogravimetric analysis, differential thermal analysis, Fourier transform infrared spectroscopy, Raman spectroscopy, and field emission scanning electron microscopy (FE-SEM). Precise cell parameters of t-prime phase and the best zirconia phase for TBC applications were calculated by Cohen’s and Rietveld refinement methods. Optimum crystallization temperature of the precursor powder was found to be 1000 °C. Furthermore, FE-SEM results for the calcined ZGYbY powders indicated orderly particles of uniform shape and size with a small tendency toward agglomeration. Average lattice thermal expansion coefficient in the temperature range of 25 °C to 1000 °C was determined to be 31.71 × 10−6 K−1.
The authors would like to acknowledge the financial support from the Iran National Science Foundation (INSF).
- 4.S. Bose, High Temperature Coatings, 2nd ed. Butterworth-Heinemann, Oxford, 2011, pp. 155-232.Google Scholar
- 11.M. Stiger, N. Yanar, M. Topping, F. Pettit, and G. Meier, Z. Metallkd., 1999, vol. 90, pp. 1069-1078.Google Scholar
- 23.D. Zhu, Y. L. Chen, and R. A. Miller, NASA/TM, 2004, 212480.Google Scholar
- 26.Sulzer Metco, Material Product Data Sheet: Zirconia Gadolinia Ytterbia Yttria Agglomerated and Sintered Thermal Spray Powder, 2015, DSMTS-0099.4.Google Scholar
- 27.L. Tan, L. Zhao, S. Guo, E. Khosravi, and S. Yang, TMS2013 Supplemental Proceedings, 2013, pp. 335–42.Google Scholar
- 35.G. Socrates, Infrared and Raman characteristic group frequencies: tables and charts, 3rd ed., John Wiley & Sons, Chichester, 2004, pp. 95-98.Google Scholar
- 38.A. Naumenko, N. Berezovska, M. Biliy, and O. Shevchenko, Phys. Chem. Solid State, 2008, vol. 9, pp. 121-125.Google Scholar