The low and high temperature thermoelectric properties of Yb3Si5
Silicides have been of great interest for thermoelectric applications due to their abundant elements as well as thermal and chemical stability. In this paper, we examined the thermoelectric properties of Yb _3 Si _5 polycrystalline samples in a wide temperature range from 10 to 800 K. The temperatur...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2021-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ac128a |
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| author | Fahim Ahmed Jaroslav Valenta Naohito Tsujii Ahmad Hussain Nawishta Jabeen Takao Mori |
| author_facet | Fahim Ahmed Jaroslav Valenta Naohito Tsujii Ahmad Hussain Nawishta Jabeen Takao Mori |
| author_sort | Fahim Ahmed |
| collection | DOAJ |
| description | Silicides have been of great interest for thermoelectric applications due to their abundant elements as well as thermal and chemical stability. In this paper, we examined the thermoelectric properties of Yb _3 Si _5 polycrystalline samples in a wide temperature range from 10 to 800 K. The temperature dependence of the Seebeck coefficient was successfully analyzed by assuming a narrow 4f quasi-particle band, indicating the intermediate valence state of Yb ^2+ -Yb ^3+ is responsible for the high power factor. A very large maximum power factor of ∼ 4.70 mWm ^−1 K ^−2 was observed at 72 K and room temperature value ∼ 1.56 mWm ^−1 K ^−2 for Yb _3 Si _5 . These results shows that Yb-Si compounds have large potential to be used as low temperature TE applications in the future. We also studied the Co-doping effect in Yb _3 Si _5 , namely, Yb _3 Co _x Si _5− _x where x = 0, 0.1, 0.15, 0.20 and investigated their thermoelectric properties. While powder X-ray diffraction analysis confirmed all main peaks indexed to Yb _3 Si _5 phase, SEM and EDX analyses revealed that Co is precipitated as metal particles, forming a composite material with Yb _3 Si _5 phase. Thermoelectric properties of the Co-doped samples are also reported. |
| first_indexed | 2024-03-12T15:42:44Z |
| format | Article |
| id | doaj.art-08f3e00e171c44768c0023b01d2d7070 |
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| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:42:44Z |
| publishDate | 2021-01-01 |
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| series | Materials Research Express |
| spelling | doaj.art-08f3e00e171c44768c0023b01d2d70702023-08-09T15:52:23ZengIOP PublishingMaterials Research Express2053-15912021-01-018707550410.1088/2053-1591/ac128aThe low and high temperature thermoelectric properties of Yb3Si5Fahim Ahmed0https://orcid.org/0000-0001-5530-9492Jaroslav Valenta1https://orcid.org/0000-0002-2268-7187Naohito Tsujii2Ahmad Hussain3Nawishta Jabeen4Takao Mori5Department of Physics, Division of Science and Technology, University of Education, Lahore 54770 , PakistanInternational Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba 305-0044, JapanInternational Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba 305-0044, JapanDepartment of Physics, The University of Lahore , Sub-campus Sargodha, 40100, PakistanDepartment of Physics, The University of Lahore , Sub-campus Sargodha, 40100, PakistanInternational Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba 305-0044, Japan; Graduate School of Pure and Applied Sciences, University of Tsukuba , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, JapanSilicides have been of great interest for thermoelectric applications due to their abundant elements as well as thermal and chemical stability. In this paper, we examined the thermoelectric properties of Yb _3 Si _5 polycrystalline samples in a wide temperature range from 10 to 800 K. The temperature dependence of the Seebeck coefficient was successfully analyzed by assuming a narrow 4f quasi-particle band, indicating the intermediate valence state of Yb ^2+ -Yb ^3+ is responsible for the high power factor. A very large maximum power factor of ∼ 4.70 mWm ^−1 K ^−2 was observed at 72 K and room temperature value ∼ 1.56 mWm ^−1 K ^−2 for Yb _3 Si _5 . These results shows that Yb-Si compounds have large potential to be used as low temperature TE applications in the future. We also studied the Co-doping effect in Yb _3 Si _5 , namely, Yb _3 Co _x Si _5− _x where x = 0, 0.1, 0.15, 0.20 and investigated their thermoelectric properties. While powder X-ray diffraction analysis confirmed all main peaks indexed to Yb _3 Si _5 phase, SEM and EDX analyses revealed that Co is precipitated as metal particles, forming a composite material with Yb _3 Si _5 phase. Thermoelectric properties of the Co-doped samples are also reported.https://doi.org/10.1088/2053-1591/ac128athermoelectrictyseebeck coefficientsilicidespower factorlow temperature TE properties |
| spellingShingle | Fahim Ahmed Jaroslav Valenta Naohito Tsujii Ahmad Hussain Nawishta Jabeen Takao Mori The low and high temperature thermoelectric properties of Yb3Si5 Materials Research Express thermoelectricty seebeck coefficient silicides power factor low temperature TE properties |
| title | The low and high temperature thermoelectric properties of Yb3Si5 |
| title_full | The low and high temperature thermoelectric properties of Yb3Si5 |
| title_fullStr | The low and high temperature thermoelectric properties of Yb3Si5 |
| title_full_unstemmed | The low and high temperature thermoelectric properties of Yb3Si5 |
| title_short | The low and high temperature thermoelectric properties of Yb3Si5 |
| title_sort | low and high temperature thermoelectric properties of yb3si5 |
| topic | thermoelectricty seebeck coefficient silicides power factor low temperature TE properties |
| url | https://doi.org/10.1088/2053-1591/ac128a |
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