Nanotwins Strengthening High Thermoelectric Performance Bismuth Antimony Telluride Alloys
Abstract Bi2Te3 based thermoelectric alloys have been commercialized in solid‐state refrigeration, but the poor mechanical properties restrict their further application. Nanotwins have been theoretically proven to effectively strengthen these alloys and could be sometimes constructed by strong defor...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2022-05-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202200432 |
| _version_ | 1818206731774197760 |
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| author | Haixu Qin Wanbo Qu Yang Zhang Yongsheng Zhang Zihang Liu Qian Zhang Haijun Wu Wei Cai Jiehe Sui |
| author_facet | Haixu Qin Wanbo Qu Yang Zhang Yongsheng Zhang Zihang Liu Qian Zhang Haijun Wu Wei Cai Jiehe Sui |
| author_sort | Haixu Qin |
| collection | DOAJ |
| description | Abstract Bi2Te3 based thermoelectric alloys have been commercialized in solid‐state refrigeration, but the poor mechanical properties restrict their further application. Nanotwins have been theoretically proven to effectively strengthen these alloys and could be sometimes constructed by strong deformation during synthesis. However, the obscure underlying formation mechanism restricts the feasibility of twin boundary engineering on Bi2Te3 based materials. Herein, thorough microstructure characterizations are employed on a series of Bi0.4Sb1.6Te3+δ alloys to systematically investigate the twins’ formation mechanism. The results show that the twins belong to the annealing type formed in the sintering process, which is sensitive to Te deficiency, rather than the deformation one. The Te deficiency combined with mechanical deformation is prerequisite for constructing dense nanotwins. By reducing the δ below −0.01 and undergoing strong deformation, samples with a high density of nanotwins are obtained and exhibit an ultrahigh compressive strength over 250 MPa, nearly twice as strong as the previous record reported in hierarchical nanostructured (Bi, Sb)2Te3 alloy. Moreover, benefitting from the suppressed intrinsic excitation, the average zT value of this robust material could reach near 1.1 within 30–250 °C. This work opens a new pathway to design high‐performance and mechanically stable Bi2Te3 based alloys for miniature device development. |
| first_indexed | 2024-12-12T04:17:41Z |
| format | Article |
| id | doaj.art-f069ab0827a04f1ca9be2e6f22529635 |
| institution | Directory Open Access Journal |
| issn | 2198-3844 |
| language | English |
| last_indexed | 2024-12-12T04:17:41Z |
| publishDate | 2022-05-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj.art-f069ab0827a04f1ca9be2e6f225296352022-12-22T00:38:24ZengWileyAdvanced Science2198-38442022-05-01914n/an/a10.1002/advs.202200432Nanotwins Strengthening High Thermoelectric Performance Bismuth Antimony Telluride AlloysHaixu Qin0Wanbo Qu1Yang Zhang2Yongsheng Zhang3Zihang Liu4Qian Zhang5Haijun Wu6Wei Cai7Jiehe Sui8State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 ChinaState Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 ChinaInstrumental Analysis Center Xi'an Jiaotong University Xi'an 710049 ChinaKey Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 ChinaState Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 ChinaDepartment of Materials Science and Engineering Harbin Institute of Technology (Shenzhen) Shenzhen 518055 ChinaState Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 ChinaState Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 ChinaState Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 ChinaAbstract Bi2Te3 based thermoelectric alloys have been commercialized in solid‐state refrigeration, but the poor mechanical properties restrict their further application. Nanotwins have been theoretically proven to effectively strengthen these alloys and could be sometimes constructed by strong deformation during synthesis. However, the obscure underlying formation mechanism restricts the feasibility of twin boundary engineering on Bi2Te3 based materials. Herein, thorough microstructure characterizations are employed on a series of Bi0.4Sb1.6Te3+δ alloys to systematically investigate the twins’ formation mechanism. The results show that the twins belong to the annealing type formed in the sintering process, which is sensitive to Te deficiency, rather than the deformation one. The Te deficiency combined with mechanical deformation is prerequisite for constructing dense nanotwins. By reducing the δ below −0.01 and undergoing strong deformation, samples with a high density of nanotwins are obtained and exhibit an ultrahigh compressive strength over 250 MPa, nearly twice as strong as the previous record reported in hierarchical nanostructured (Bi, Sb)2Te3 alloy. Moreover, benefitting from the suppressed intrinsic excitation, the average zT value of this robust material could reach near 1.1 within 30–250 °C. This work opens a new pathway to design high‐performance and mechanically stable Bi2Te3 based alloys for miniature device development.https://doi.org/10.1002/advs.202200432Bi2Te3mechanical propertiesnanotwinsthermoelectric performance |
| spellingShingle | Haixu Qin Wanbo Qu Yang Zhang Yongsheng Zhang Zihang Liu Qian Zhang Haijun Wu Wei Cai Jiehe Sui Nanotwins Strengthening High Thermoelectric Performance Bismuth Antimony Telluride Alloys Advanced Science Bi2Te3 mechanical properties nanotwins thermoelectric performance |
| title | Nanotwins Strengthening High Thermoelectric Performance Bismuth Antimony Telluride Alloys |
| title_full | Nanotwins Strengthening High Thermoelectric Performance Bismuth Antimony Telluride Alloys |
| title_fullStr | Nanotwins Strengthening High Thermoelectric Performance Bismuth Antimony Telluride Alloys |
| title_full_unstemmed | Nanotwins Strengthening High Thermoelectric Performance Bismuth Antimony Telluride Alloys |
| title_short | Nanotwins Strengthening High Thermoelectric Performance Bismuth Antimony Telluride Alloys |
| title_sort | nanotwins strengthening high thermoelectric performance bismuth antimony telluride alloys |
| topic | Bi2Te3 mechanical properties nanotwins thermoelectric performance |
| url | https://doi.org/10.1002/advs.202200432 |
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