Superior thermal and oxygen barrier properties of high-entropy ferroelastic rare earth tantalate (8RE1/8)TaO4
Thermal/environmental barrier coatings (T/EBCs) are used to protect hot-section superalloys and/or ceramic matrix composite components from hot corrosion and oxidation; however, the majority of T/EBCs exhibit extremely high thermal and ionic conductivities. Here, we obtain a novel rare-earth tantala...
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2024-12-01
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| Series: | Journal of Advanced Ceramics |
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| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2024.9221000 |
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| author | Jun Wang Yongpan Zeng Xiaoyu Chong Manyu Zhang Qianqian Jin Yanjun Sun Xiangwei Tang Peng Wu Jing Feng |
| author_facet | Jun Wang Yongpan Zeng Xiaoyu Chong Manyu Zhang Qianqian Jin Yanjun Sun Xiangwei Tang Peng Wu Jing Feng |
| author_sort | Jun Wang |
| collection | DOAJ |
| description | Thermal/environmental barrier coatings (T/EBCs) are used to protect hot-section superalloys and/or ceramic matrix composite components from hot corrosion and oxidation; however, the majority of T/EBCs exhibit extremely high thermal and ionic conductivities. Here, we obtain a novel rare-earth tantalate with excellent oxygen and thermal insulation via a high-entropy strategy. The high-entropy component (8RE1/8)TaO4 (RE = rare earth), which is designed by large size disorder and mass disorder, has been reassembled into a stabilized monoclinic structure. (8RE1/8)TaO4 had 30.0%–31.1% and 59.2%–67.5% lower intrinsic thermal conductivity than single-RE RETaO4 and 8(Y2O3–ZrO2) 8YSZ at 1200 °C, respectively, and exhibited lower intrinsic thermal conductivity across the entire temperature range of 100–1200 °C. This is the result of strong scattering by the phonon–phonon, grain boundary, domain boundary, dislocation, and vacancy defects. The ionic conductivity of (8RE1/8)TaO4 is 3712–29,667 times lower than that of 8YSZ at 900 °C, benefiting from the strong Ta–O bonding strength, low concentration of mobile oxygen vacancies and severe lattice distortions that impede carrier transport. Moreover, (8RE1/8)TaO4 had superior high-temperature stability and excellent mechanical properties. Analysis of above results demonstrates that (8RE1/8)TaO4 is a promising candidate for T/EBCs. |
| format | Article |
| id | doaj-art-9448f7acf4134f6890ae507bc403b7d2 |
| institution | Kabale University |
| issn | 2226-4108 2227-8508 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Journal of Advanced Ceramics |
| spelling | doaj-art-9448f7acf4134f6890ae507bc403b7d22024-12-29T16:07:50ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082024-12-0113122051206710.26599/JAC.2024.9221000Superior thermal and oxygen barrier properties of high-entropy ferroelastic rare earth tantalate (8RE1/8)TaO4Jun Wang0Yongpan Zeng1Xiaoyu Chong2Manyu Zhang3Qianqian Jin4Yanjun Sun5Xiangwei Tang6Peng Wu7Jing Feng8Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaGuangdong Midea Kitchen Appliances Manufacturing Co., Ltd., Midea Group, Foshan 528300, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaMaterials Science and Engineering Research Center, Guangxi University of Science and Technology, Liuzhou 545006, ChinaGuangdong Midea Kitchen Appliances Manufacturing Co., Ltd., Midea Group, Foshan 528300, ChinaGuangdong Midea Kitchen Appliances Manufacturing Co., Ltd., Midea Group, Foshan 528300, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaThermal/environmental barrier coatings (T/EBCs) are used to protect hot-section superalloys and/or ceramic matrix composite components from hot corrosion and oxidation; however, the majority of T/EBCs exhibit extremely high thermal and ionic conductivities. Here, we obtain a novel rare-earth tantalate with excellent oxygen and thermal insulation via a high-entropy strategy. The high-entropy component (8RE1/8)TaO4 (RE = rare earth), which is designed by large size disorder and mass disorder, has been reassembled into a stabilized monoclinic structure. (8RE1/8)TaO4 had 30.0%–31.1% and 59.2%–67.5% lower intrinsic thermal conductivity than single-RE RETaO4 and 8(Y2O3–ZrO2) 8YSZ at 1200 °C, respectively, and exhibited lower intrinsic thermal conductivity across the entire temperature range of 100–1200 °C. This is the result of strong scattering by the phonon–phonon, grain boundary, domain boundary, dislocation, and vacancy defects. The ionic conductivity of (8RE1/8)TaO4 is 3712–29,667 times lower than that of 8YSZ at 900 °C, benefiting from the strong Ta–O bonding strength, low concentration of mobile oxygen vacancies and severe lattice distortions that impede carrier transport. Moreover, (8RE1/8)TaO4 had superior high-temperature stability and excellent mechanical properties. Analysis of above results demonstrates that (8RE1/8)TaO4 is a promising candidate for T/EBCs.https://www.sciopen.com/article/10.26599/JAC.2024.9221000thermal/environmental barrier coatings (t/ebcs)rare-earth tantalatehigh entropythermal conductivityionic conductivity |
| spellingShingle | Jun Wang Yongpan Zeng Xiaoyu Chong Manyu Zhang Qianqian Jin Yanjun Sun Xiangwei Tang Peng Wu Jing Feng Superior thermal and oxygen barrier properties of high-entropy ferroelastic rare earth tantalate (8RE1/8)TaO4 Journal of Advanced Ceramics thermal/environmental barrier coatings (t/ebcs) rare-earth tantalate high entropy thermal conductivity ionic conductivity |
| title | Superior thermal and oxygen barrier properties of high-entropy ferroelastic rare earth tantalate (8RE1/8)TaO4 |
| title_full | Superior thermal and oxygen barrier properties of high-entropy ferroelastic rare earth tantalate (8RE1/8)TaO4 |
| title_fullStr | Superior thermal and oxygen barrier properties of high-entropy ferroelastic rare earth tantalate (8RE1/8)TaO4 |
| title_full_unstemmed | Superior thermal and oxygen barrier properties of high-entropy ferroelastic rare earth tantalate (8RE1/8)TaO4 |
| title_short | Superior thermal and oxygen barrier properties of high-entropy ferroelastic rare earth tantalate (8RE1/8)TaO4 |
| title_sort | superior thermal and oxygen barrier properties of high entropy ferroelastic rare earth tantalate 8re1 8 tao4 |
| topic | thermal/environmental barrier coatings (t/ebcs) rare-earth tantalate high entropy thermal conductivity ionic conductivity |
| url | https://www.sciopen.com/article/10.26599/JAC.2024.9221000 |
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