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Grain-by-grain compositional variations and interstitial metals - a new route towards achieving high performance in Half-Heusler thermoelectrics
| hal.structure.identifier | Institute of Chemical Sciences and Centre for Advanced Energy Storage and Recovery | |
| dc.contributor.author | BARCZAK, Sonia | |
| hal.structure.identifier | SUPA School of Physics and Astronomy [Glasgow] | |
| dc.contributor.author | HALPIN, John | |
| hal.structure.identifier | Institute of Petroleum Engineering | |
| dc.contributor.author | BUCKMAN, Jim | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DECOURT, Rodolphe | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | POLLET, Michaël | |
| hal.structure.identifier | ISIS Facility | |
| dc.contributor.author | SMITH, Ronald | |
| hal.structure.identifier | SUPA School of Physics and Astronomy [Glasgow] | |
| dc.contributor.author | MACLAREN, Donald | |
| hal.structure.identifier | Institute of Chemical Sciences and Centre for Advanced Energy Storage and Recovery | |
| dc.contributor.author | BOS, Jan-Willem | |
| dc.date.issued | 2018-01-25 | |
| dc.identifier.issn | 1944-8244 | |
| dc.description.abstractEn | Half-Heusler alloys based on TiNiSn are promising thermoelectric materials characterized by large power factors and good mechanical and thermal stabilities, but they are limited by large thermal conductivities. A variety of strategies have been used to disrupt their thermal transport, including alloying with heavy, generally expensive, elements and nanostructuring, enabling figures of merit, ZT ≥ 1 at elevated temperatures (>773 K). Here, we demonstrate an alternative strategy that is based around the partial segregation of excess Cu leading to grain-by-grain compositional variations, the formation of extruded Cu “wetting layers” between grains, and—most importantly—the presence of statistically distributed interstitials that reduce the thermal conductivity effectively through point-defect scattering. Our best TiNiCuySn (y ≤ 0.1) compositions have a temperature-averaged ZTdevice = 0.3–0.4 and estimated leg power outputs of 6–7 W cm–2 in the 323–773 K temperature range. This is a significant development as these materials were prepared using a straightforward processing method, do not contain any toxic, expensive, or scarce elements, and are therefore promising candidates for large-scale production. | |
| dc.language.iso | en | |
| dc.publisher | Washington, D.C. : American Chemical Society | |
| dc.subject.en | half-Heusler | |
| dc.subject.en | phase segregation | |
| dc.subject.en | structure−property relationships | |
| dc.subject.en | thermoelectrics | |
| dc.subject.en | TiNiSn | |
| dc.title.en | Grain-by-grain compositional variations and interstitial metals - a new route towards achieving high performance in Half-Heusler thermoelectrics | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1021/acsami.7b14525 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | ACS Applied Materials & Interfaces | |
| bordeaux.page | 4786-4793 | |
| bordeaux.volume | 10 | |
| bordeaux.issue | 5 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01717721 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01717721v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=ACS%20Applied%20Materials%20&%20Interfaces&rft.date=2018-01-25&rft.volume=10&rft.issue=5&rft.spage=4786-4793&rft.epage=4786-4793&rft.eissn=1944-8244&rft.issn=1944-8244&rft.au=BARCZAK,%20Sonia&HALPIN,%20John&BUCKMAN,%20Jim&DECOURT,%20Rodolphe&POLLET,%20Micha%C3%ABl&rft.genre=article |
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