Ti Addition Effect on the Grain Structure Evolution and Thermoelectric Transport Properties of Hf<sub>0.5</sub>Zr<sub>0.5</sub>NiSn<sub>0.98</sub>Sb<sub>0.02</sub> Half-Heusler Alloy
Compositional tuning is one of the important approaches to enhance the electronic and thermal transport properties of thermoelectric materials since it can generate point defects as well as control the phase evolution behavior. Herein, we investigated the Ti addition effect on the grain growth durin...
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| author | Junsang Cho Taegyu Park Ki Wook Bae Hyun-Sik Kim Soon-Mok Choi Sang-il Kim Sung Wng Kim |
| author_facet | Junsang Cho Taegyu Park Ki Wook Bae Hyun-Sik Kim Soon-Mok Choi Sang-il Kim Sung Wng Kim |
| author_sort | Junsang Cho |
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| description | Compositional tuning is one of the important approaches to enhance the electronic and thermal transport properties of thermoelectric materials since it can generate point defects as well as control the phase evolution behavior. Herein, we investigated the Ti addition effect on the grain growth during melt spinning and thermoelectric transport properties of Hf<sub>0</sub><sub>.5</sub>Zr<sub>0.5</sub>NiSn<sub>0.98</sub>Sb<sub>0.02</sub> half-Heusler compound. The characteristic grain size of melt-spun ribbons was reduced by Ti addition, and very low lattice thermal conductivity lower than 0.27 W m<sup>−1</sup> K<sup>−1</sup> was obtained within the whole measured temperature range (300–800 K) due to the intensified point defect (substituted Ti) and grain boundary (reduced grain size) phonon scattering. Due to this synergetic effect on the thermal transport properties, a maximum thermoelectric figure of merit, <i>zT</i>, of 0.47 was obtained at 800 K in (Hf<sub>0</sub><sub>.5</sub>Zr<sub>0.5</sub>)<sub>0.8</sub>Ti<sub>0.2</sub>NiSn<sub>0.98</sub>Sb<sub>0.02</sub>. |
| first_indexed | 2024-03-10T09:33:18Z |
| format | Article |
| id | doaj.art-460a23cef92b49fe9b6cb2913f3e6f15 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T09:33:18Z |
| publishDate | 2021-07-01 |
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| spelling | doaj.art-460a23cef92b49fe9b6cb2913f3e6f152023-11-22T04:18:36ZengMDPI AGMaterials1996-19442021-07-011414402910.3390/ma14144029Ti Addition Effect on the Grain Structure Evolution and Thermoelectric Transport Properties of Hf<sub>0.5</sub>Zr<sub>0.5</sub>NiSn<sub>0.98</sub>Sb<sub>0.02</sub> Half-Heusler AlloyJunsang Cho0Taegyu Park1Ki Wook Bae2Hyun-Sik Kim3Soon-Mok Choi4Sang-il Kim5Sung Wng Kim6Department of Artificial Intelligence, Sungkyunkwan University, Suwon 16419, KoreaMaterials and Components Policy Division, Ministry of Trade, Industry and Energy, Sejong 30118, KoreaR&D Center, CY Autotech Co., Ltd., Hwaseong 18336, KoreaDepartment of Materials Science and Engineering, Hongik University, Seoul 04066, KoreaSchool of Energy, Materials and Chemical Engineering, Korea University of Technology and Education, Cheonan 31253, KoreaDepartment of Materials Science and Engineering, University of Seoul, Seoul 02504, KoreaDepartment of Energy Science, Sungkyunkwan University, Suwon 16419, KoreaCompositional tuning is one of the important approaches to enhance the electronic and thermal transport properties of thermoelectric materials since it can generate point defects as well as control the phase evolution behavior. Herein, we investigated the Ti addition effect on the grain growth during melt spinning and thermoelectric transport properties of Hf<sub>0</sub><sub>.5</sub>Zr<sub>0.5</sub>NiSn<sub>0.98</sub>Sb<sub>0.02</sub> half-Heusler compound. The characteristic grain size of melt-spun ribbons was reduced by Ti addition, and very low lattice thermal conductivity lower than 0.27 W m<sup>−1</sup> K<sup>−1</sup> was obtained within the whole measured temperature range (300–800 K) due to the intensified point defect (substituted Ti) and grain boundary (reduced grain size) phonon scattering. Due to this synergetic effect on the thermal transport properties, a maximum thermoelectric figure of merit, <i>zT</i>, of 0.47 was obtained at 800 K in (Hf<sub>0</sub><sub>.5</sub>Zr<sub>0.5</sub>)<sub>0.8</sub>Ti<sub>0.2</sub>NiSn<sub>0.98</sub>Sb<sub>0.02</sub>.https://www.mdpi.com/1996-1944/14/14/4029point defectthermoelectrichalf-Heuslerlattice thermal conductivityphonon scattering |
| spellingShingle | Junsang Cho Taegyu Park Ki Wook Bae Hyun-Sik Kim Soon-Mok Choi Sang-il Kim Sung Wng Kim Ti Addition Effect on the Grain Structure Evolution and Thermoelectric Transport Properties of Hf<sub>0.5</sub>Zr<sub>0.5</sub>NiSn<sub>0.98</sub>Sb<sub>0.02</sub> Half-Heusler Alloy Materials point defect thermoelectric half-Heusler lattice thermal conductivity phonon scattering |
| title | Ti Addition Effect on the Grain Structure Evolution and Thermoelectric Transport Properties of Hf<sub>0.5</sub>Zr<sub>0.5</sub>NiSn<sub>0.98</sub>Sb<sub>0.02</sub> Half-Heusler Alloy |
| title_full | Ti Addition Effect on the Grain Structure Evolution and Thermoelectric Transport Properties of Hf<sub>0.5</sub>Zr<sub>0.5</sub>NiSn<sub>0.98</sub>Sb<sub>0.02</sub> Half-Heusler Alloy |
| title_fullStr | Ti Addition Effect on the Grain Structure Evolution and Thermoelectric Transport Properties of Hf<sub>0.5</sub>Zr<sub>0.5</sub>NiSn<sub>0.98</sub>Sb<sub>0.02</sub> Half-Heusler Alloy |
| title_full_unstemmed | Ti Addition Effect on the Grain Structure Evolution and Thermoelectric Transport Properties of Hf<sub>0.5</sub>Zr<sub>0.5</sub>NiSn<sub>0.98</sub>Sb<sub>0.02</sub> Half-Heusler Alloy |
| title_short | Ti Addition Effect on the Grain Structure Evolution and Thermoelectric Transport Properties of Hf<sub>0.5</sub>Zr<sub>0.5</sub>NiSn<sub>0.98</sub>Sb<sub>0.02</sub> Half-Heusler Alloy |
| title_sort | ti addition effect on the grain structure evolution and thermoelectric transport properties of hf sub 0 5 sub zr sub 0 5 sub nisn sub 0 98 sub sb sub 0 02 sub half heusler alloy |
| topic | point defect thermoelectric half-Heusler lattice thermal conductivity phonon scattering |
| url | https://www.mdpi.com/1996-1944/14/14/4029 |
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