Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multi-scale defect analysis
Thermal barrier coating (TBC) materials can improve energy conversion efficiency and reduce fossil fuel use. Herein, novel rare earth tantalates RETaO4, as promising candidates for TBCs, were reassembled into multi-component solid solutions with a monoclinic structure to further depress thermal cond...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2023-11-01
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| Series: | Journal of Advanced Ceramics |
| Subjects: | |
| Online Access: | https://www.sciopen.com/article/10.26599/JAC.2023.9220811 |
| _version_ | 1827578413322338304 |
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| author | Jun Wang Qianqian Jin Jianbo Song Di Zhang Bin Xu Zhiyi Ren Meng Wang Shixiao Yan Xiaoliang Sun Chi Liu Xiaoyu Chong Jing Feng |
| author_facet | Jun Wang Qianqian Jin Jianbo Song Di Zhang Bin Xu Zhiyi Ren Meng Wang Shixiao Yan Xiaoliang Sun Chi Liu Xiaoyu Chong Jing Feng |
| author_sort | Jun Wang |
| collection | DOAJ |
| description | Thermal barrier coating (TBC) materials can improve energy conversion efficiency and reduce fossil fuel use. Herein, novel rare earth tantalates RETaO4, as promising candidates for TBCs, were reassembled into multi-component solid solutions with a monoclinic structure to further depress thermal conductivity via an entropy strategy. The formation mechanisms of oxygen vacancy defects, dislocations, and ferroelastic domains associated with the thermal conductivity are demonstrated by aberration-corrected scanning transmission electron microscopy. Compared to single-RE RETaO4 and 8YSZ, the intrinsic thermal conductivity of (5RE1/5)TaO4 was decreased by 35%–47% and 57%–69% at 1200 ℃, respectively, which is likely attributed to multi-scale phonon scattering from Umklapp phonon–phonon, point defects, domain structures, and dislocations. r¯RE3+/rTa5+ and low-temperature thermal conductivity are negatively correlated, as are the ratio of elastic modulus to thermal conductivity (E/κ) and high-temperature thermal conductivity. Meanwhile, the high defects’ concentration and lattice distortion in high-entropy ceramics enhance the scattering of transverse-wave phonons and reduce the transverse-wave sound velocity, leading to a decrease in the thermal conductivity and Young’s modulus. In addition, 5HEC-1 has ultra-low thermal conductivity, moderate thermal expansion coefficients, and high hardness among three five-component high-entropy samples. Thus, 5HEC-1 with superior thermal barrier and mechanical properties can be used as promising thermal insulating materials. |
| first_indexed | 2024-03-08T21:46:12Z |
| format | Article |
| id | doaj.art-9f6c2519b89943a4ac59296356c0a640 |
| institution | Directory Open Access Journal |
| issn | 2226-4108 2227-8508 |
| language | English |
| last_indexed | 2024-03-08T21:46:12Z |
| publishDate | 2023-11-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Journal of Advanced Ceramics |
| spelling | doaj.art-9f6c2519b89943a4ac59296356c0a6402023-12-20T09:05:49ZengTsinghua University PressJournal of Advanced Ceramics2226-41082227-85082023-11-0112112087210010.26599/JAC.2023.9220811Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multi-scale defect analysisJun Wang0Qianqian Jin1Jianbo Song2Di Zhang3Bin Xu4Zhiyi Ren5Meng Wang6Shixiao Yan7Xiaoliang Sun8Chi Liu9Xiaoyu Chong10Jing Feng11Faculty 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, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaShanghai Electro–Mechanical Engineering Institute, Shanghai 201109, ChinaShanghai Electro–Mechanical Engineering Institute, Shanghai 201109, ChinaShanghai Electro–Mechanical Engineering Institute, Shanghai 201109, ChinaShanghai Electro–Mechanical Engineering Institute, Shanghai 201109, ChinaShanghai Spaceflight Precision Machinery Institute, Shanghai 201109, ChinaShanghai Spaceflight Precision Machinery Institute, Shanghai 201109, ChinaShanghai Spaceflight Precision Machinery Institute, Shanghai 201109, 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 barrier coating (TBC) materials can improve energy conversion efficiency and reduce fossil fuel use. Herein, novel rare earth tantalates RETaO4, as promising candidates for TBCs, were reassembled into multi-component solid solutions with a monoclinic structure to further depress thermal conductivity via an entropy strategy. The formation mechanisms of oxygen vacancy defects, dislocations, and ferroelastic domains associated with the thermal conductivity are demonstrated by aberration-corrected scanning transmission electron microscopy. Compared to single-RE RETaO4 and 8YSZ, the intrinsic thermal conductivity of (5RE1/5)TaO4 was decreased by 35%–47% and 57%–69% at 1200 ℃, respectively, which is likely attributed to multi-scale phonon scattering from Umklapp phonon–phonon, point defects, domain structures, and dislocations. r¯RE3+/rTa5+ and low-temperature thermal conductivity are negatively correlated, as are the ratio of elastic modulus to thermal conductivity (E/κ) and high-temperature thermal conductivity. Meanwhile, the high defects’ concentration and lattice distortion in high-entropy ceramics enhance the scattering of transverse-wave phonons and reduce the transverse-wave sound velocity, leading to a decrease in the thermal conductivity and Young’s modulus. In addition, 5HEC-1 has ultra-low thermal conductivity, moderate thermal expansion coefficients, and high hardness among three five-component high-entropy samples. Thus, 5HEC-1 with superior thermal barrier and mechanical properties can be used as promising thermal insulating materials.https://www.sciopen.com/article/10.26599/JAC.2023.9220811thermal barrier coating (tbc)entropy strategyoxygen vacancydislocationferroelastic domainsintrinsic thermal conductivity |
| spellingShingle | Jun Wang Qianqian Jin Jianbo Song Di Zhang Bin Xu Zhiyi Ren Meng Wang Shixiao Yan Xiaoliang Sun Chi Liu Xiaoyu Chong Jing Feng Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multi-scale defect analysis Journal of Advanced Ceramics thermal barrier coating (tbc) entropy strategy oxygen vacancy dislocation ferroelastic domains intrinsic thermal conductivity |
| title | Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multi-scale defect analysis |
| title_full | Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multi-scale defect analysis |
| title_fullStr | Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multi-scale defect analysis |
| title_full_unstemmed | Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multi-scale defect analysis |
| title_short | Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multi-scale defect analysis |
| title_sort | revealing the low thermal conductivity of high entropy rare earth tantalates via multi scale defect analysis |
| topic | thermal barrier coating (tbc) entropy strategy oxygen vacancy dislocation ferroelastic domains intrinsic thermal conductivity |
| url | https://www.sciopen.com/article/10.26599/JAC.2023.9220811 |
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