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Effect of Ta5+ doping on the thermal physical properties of defective fluorite Y3NbO7 ceramics |
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| Authors: | Dowon Song Janghyeok Pyeon Myeungwoo Ryu Hak-Beom Jeon Yoon-Suk Oh Taeseup Song Ungyu Paik SeungCheol Yang Yeon-Gil Jung |
| Affiliation: | 1. Department of Energy Engineering, Hanyang University, Seoul, Republic of Korea
These authors contributed equally to this work.;2. Department of Materials Convergence and System Engineering, Changwon National University, Changwon, Republic of Korea These authors contributed equally to this work.;3. Department of Energy Engineering, Hanyang University, Seoul, Republic of Korea;4. Korea Institute of Ceramic Engineering and Technology, Gyeonggi-do, Republic of Korea;5. Department of Materials Convergence and System Engineering, Changwon National University, Changwon, Republic of Korea |
| Abstract: | The effects of substituting the B cation in A3BO7 ceramics on their thermal physical properties were investigated by applying a large mass difference. Y3(Nb1-xTax)O7 (x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) ceramics were synthesized, and their structural characteristics were determined. All the fabricated Y3(Nb1-xTax)O7 ceramics showed defective fluorite structures and glass-like low thermal conductivity (1.18?2.04 W/m?K at 25°C) because of the highly distorted crystal structure and significant mass difference. Substitution with Ta5+ enhanced the sintering resistance, leading to superior thermal-insulating performance via grain boundary scattering. Furthermore, the ceramics exhibited excellent coefficients of thermal expansion, implying the promising applicability of Y3(Nb1-xTax)O7 as new thermal barrier materials. The effect of mass difference on the thermomechanical properties of the ceramics was examined, suggesting a simple strategy for engineering the chemical composition of new thermal barrier materials. |
| Keywords: | mechanical properties oxides thermal barrier coatings thermal conductivity thermal expansion |