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Synthesis and characterization of ((La1-xGdx)2Zr2O7; x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 1) nanoparticles for advanced TBCs

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Abstract

Multicomponent rare-earth oxide-doped zirconia-based thermal barrier coatings (TBCs) are attractive alternatives for yttria-stabilized zirconia (YSZ) in advanced TBC applications. In this study, a zirconia-based nanopowder doped by multiple rare-earth oxides ((La1-xGdx)2Zr2O7; x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 1) was synthesized using sol-gel and calcination method. The product was then characterized by X-ray diffraction (XRD), simultaneous thermal analysis (STA), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and dilatometric test. According to STA results, the proper calcination temperature of (La1-xGdx)2Zr2O7 nanopowders could be considered > 800 °C. The results indicated that Gd2Zr2O7 exhibits a defect fluorite-type structure, and with the incorporation of larger La3+, it transformed into an ordered pyrochlore-type structure. The microstructure and morphology of the product were studied by field emission scanning electron microscopy (FESEM), revealing the formation of (La1-xGdx)2Zr2O7 nanoparticles with the mean size below 100 nm. Also, the thermal expansion coefficient of (La1-xGdx)2Zr2O7 nanoparticles was determined 8–12.5 × 10−6 K−1 at 1000 °C.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, Faculty of Technology and Engineering, Shahrekord University, P.O. Box 115, Shahrekord, Iran

    A. Keyvani, P. Mahmoudinezhad & A. Jahangiri

  2. Department of Ceramics, Materials and Energy Research Center, Karaj, Iran

    M. Bahamirian

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  1. A. Keyvani
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  2. P. Mahmoudinezhad
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Keyvani, A., Mahmoudinezhad, P., Jahangiri, A. et al. Synthesis and characterization of ((La1-xGdx)2Zr2O7; x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 1) nanoparticles for advanced TBCs. J Aust Ceram Soc 56, 1543–1550 (2020). https://doi.org/10.1007/s41779-020-00500-1

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