Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n‐Bi2Te3 Thermoelectrics
Abstract Over the past years, thermoelectric Mg3Sb2 alloys particularly in n‐type conduction, have attracted increasing attentions for thermoelectric applications, due to the multivalley conduction band, abundance of constituents, and less toxicity. However, the high vapor pressure, causticity of Mg...
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| Format: | Article |
| Language: | English |
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Wiley
2019-08-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.201802286 |
| _version_ | 1818856660111720448 |
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| author | Xuemin Shi Cheng Sun Zhonglin Bu Xinyue Zhang Yixuan Wu Siqi Lin Wen Li Alireza Faghaninia Anubhav Jain Yanzhong Pei |
| author_facet | Xuemin Shi Cheng Sun Zhonglin Bu Xinyue Zhang Yixuan Wu Siqi Lin Wen Li Alireza Faghaninia Anubhav Jain Yanzhong Pei |
| author_sort | Xuemin Shi |
| collection | DOAJ |
| description | Abstract Over the past years, thermoelectric Mg3Sb2 alloys particularly in n‐type conduction, have attracted increasing attentions for thermoelectric applications, due to the multivalley conduction band, abundance of constituents, and less toxicity. However, the high vapor pressure, causticity of Mg, and the high melting point of Mg3Sb2 tend to cause the inclusion in the materials of boundary phases and defects that affect the transport properties. In this work, a utilization of tantalum‐sealing for melting enables n‐type Mg3Sb2 alloys to show a substantially higher mobility than ever reported, which can be attributed to the purification of phases and to the coarse grains. Importantly, the inherently high mobility successfully enables the thermoelectric figure of merit in optimal compositions to be highly competitive to that of commercially available n‐type Bi2Te3 alloys and to be higher than that of other known n‐type thermoelectrics at 300–500 K. This work reveals Mg3Sb2 alloys as a top candidate for near‐room‐temperature thermoelectric applications. |
| first_indexed | 2024-12-19T08:28:01Z |
| format | Article |
| id | doaj.art-410539df933543c6a35d373d6aeed0b8 |
| institution | Directory Open Access Journal |
| issn | 2198-3844 |
| language | English |
| last_indexed | 2024-12-19T08:28:01Z |
| publishDate | 2019-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj.art-410539df933543c6a35d373d6aeed0b82022-12-21T20:29:16ZengWileyAdvanced Science2198-38442019-08-01616n/an/a10.1002/advs.201802286Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n‐Bi2Te3 ThermoelectricsXuemin Shi0Cheng Sun1Zhonglin Bu2Xinyue Zhang3Yixuan Wu4Siqi Lin5Wen Li6Alireza Faghaninia7Anubhav Jain8Yanzhong Pei9Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji University 4800 Caoan Road Shanghai 201804 ChinaInterdisciplinary Materials Research Center School of Materials Science and Engineering Tongji University 4800 Caoan Road Shanghai 201804 ChinaInterdisciplinary Materials Research Center School of Materials Science and Engineering Tongji University 4800 Caoan Road Shanghai 201804 ChinaInterdisciplinary Materials Research Center School of Materials Science and Engineering Tongji University 4800 Caoan Road Shanghai 201804 ChinaInterdisciplinary Materials Research Center School of Materials Science and Engineering Tongji University 4800 Caoan Road Shanghai 201804 ChinaInterdisciplinary Materials Research Center School of Materials Science and Engineering Tongji University 4800 Caoan Road Shanghai 201804 ChinaInterdisciplinary Materials Research Center School of Materials Science and Engineering Tongji University 4800 Caoan Road Shanghai 201804 ChinaLawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley CA 94720 USALawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley CA 94720 USAInterdisciplinary Materials Research Center School of Materials Science and Engineering Tongji University 4800 Caoan Road Shanghai 201804 ChinaAbstract Over the past years, thermoelectric Mg3Sb2 alloys particularly in n‐type conduction, have attracted increasing attentions for thermoelectric applications, due to the multivalley conduction band, abundance of constituents, and less toxicity. However, the high vapor pressure, causticity of Mg, and the high melting point of Mg3Sb2 tend to cause the inclusion in the materials of boundary phases and defects that affect the transport properties. In this work, a utilization of tantalum‐sealing for melting enables n‐type Mg3Sb2 alloys to show a substantially higher mobility than ever reported, which can be attributed to the purification of phases and to the coarse grains. Importantly, the inherently high mobility successfully enables the thermoelectric figure of merit in optimal compositions to be highly competitive to that of commercially available n‐type Bi2Te3 alloys and to be higher than that of other known n‐type thermoelectrics at 300–500 K. This work reveals Mg3Sb2 alloys as a top candidate for near‐room‐temperature thermoelectric applications.https://doi.org/10.1002/advs.201802286grain sizehigh mobilityMg3Sb2 alloysthermoelectrics |
| spellingShingle | Xuemin Shi Cheng Sun Zhonglin Bu Xinyue Zhang Yixuan Wu Siqi Lin Wen Li Alireza Faghaninia Anubhav Jain Yanzhong Pei Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n‐Bi2Te3 Thermoelectrics Advanced Science grain size high mobility Mg3Sb2 alloys thermoelectrics |
| title | Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n‐Bi2Te3 Thermoelectrics |
| title_full | Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n‐Bi2Te3 Thermoelectrics |
| title_fullStr | Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n‐Bi2Te3 Thermoelectrics |
| title_full_unstemmed | Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n‐Bi2Te3 Thermoelectrics |
| title_short | Revelation of Inherently High Mobility Enables Mg3Sb2 as a Sustainable Alternative to n‐Bi2Te3 Thermoelectrics |
| title_sort | revelation of inherently high mobility enables mg3sb2 as a sustainable alternative to n bi2te3 thermoelectrics |
| topic | grain size high mobility Mg3Sb2 alloys thermoelectrics |
| url | https://doi.org/10.1002/advs.201802286 |
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