dc.contributor.author | Song, Lirong | |
dc.contributor.author | Blichfeld, Anders Bank | |
dc.contributor.author | Zhang, Jaiwai | |
dc.contributor.author | Kasai, Hidetaka | |
dc.contributor.author | Iversen, Bo B | |
dc.date.accessioned | 2018-09-21T06:33:08Z | |
dc.date.available | 2018-09-21T06:33:08Z | |
dc.date.created | 2018-09-20T13:50:02Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Journal of Materials Chemistry A. 2018, 6 (9), 4079-4087. | nb_NO |
dc.identifier.issn | 2050-7488 | |
dc.identifier.uri | http://hdl.handle.net/11250/2563766 | |
dc.description.abstract | Here we report that the thermoelectric properties of bulk β-Zn4Sb3 can be improved in the range 300–575 K by Ag doping at the Zn sites. Proper Ag doping leads to decreased electrical resistivity and increased Seebeck coefficient, thus resulting in a large improvement in power factor. The figure of merit, zT, has an obvious enhancement due to Ag doping although the thermal conductivity is slightly increased. (Zn0.9925Ag0.0075)4Sb3 exhibits a promising zT of ∼1.2 at 575 K, which is superior to most previously reported p-type doped Zn4Sb3 materials. Furthermore, the high-temperature thermal stability is studied in detail. The (Zn0.9925Ag0.0075)4Sb3 bulk sample does not decompose even when the temperature is elevated to 793 K in vacuum. When the bulk sample is heated to 573 K in air, (Zn0.9925Ag0.0075)4Sb3 is also stable, unlike undoped Zn4Sb3 where Zn whiskers come out of the surface. In-house in situ powder X-ray diffraction (PXRD) and multi-temperature synchrotron PXRD (up to 793 K) reveal that the undoped Zn4Sb3 powder sample starts decomposing into ZnSb at 473 K if exposed to the air and it is fully decomposed into ZnSb, ZnO, and Sb after cooling down from 793 to 300 K. However, there is ∼24 wt% Zn4Sb3 preserved in the (Zn0.995Ag0.005)4Sb3 powder sample after the same heat treatment, while only ∼6 wt% Zn4Sb3 remains in (Zn0.99Ag0.01)4Sb3. The above result indicates that proper Ag doping leads to enhanced high-temperature thermal stability in β-Zn4Sb3. This work thereby suggests Ag-doped Zn4Sb3 bulk material as a promising candidate for thermoelectric applications in terms of enhanced performance as well as improved high-temperature thermal stability. | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | Royal Society of Chemistry | nb_NO |
dc.title | Enhanced thermoelectric performance and high-temperature thermal stability of p-type Ag-doped β-Zn4Sb3 | nb_NO |
dc.type | Journal article | nb_NO |
dc.description.version | submittedVersion | nb_NO |
dc.source.pagenumber | 4079-4087 | nb_NO |
dc.source.volume | 6 | nb_NO |
dc.source.journal | Journal of Materials Chemistry A | nb_NO |
dc.source.issue | 9 | nb_NO |
dc.identifier.doi | 10.1039/C7TA10859A | |
dc.identifier.cristin | 1611528 | |
dc.relation.project | Norges forskningsråd: 250403 | nb_NO |
dc.description.localcode | This is a submitted manuscript of an article published by Royal Society of Chemistry in Journal of Materials Chemistry A, 05 Feb 2018 | nb_NO |
cristin.unitcode | 194,66,35,0 | |
cristin.unitname | Institutt for materialteknologi | |
cristin.ispublished | true | |
cristin.fulltext | preprint | |
cristin.qualitycode | 1 | |