{"title":"Unravelling the Ultralow Thermal Conductivity of Ternary Antimonide Zintl Phase RbGaSb2: A First-principles Study","authors":"","doi":"10.56042/ijpap.v61i9.3152","DOIUrl":null,"url":null,"abstract":"The recent discovery of antimonide based Zintl phase compounds has sparked the research in finding high-performance thermoelectric materials. In present study, a ternary antimonide Zintl phase RbGaSb 2 is investigated using First-principles calculations. A good agreement observed between our computed results, such as lattice parameter and thermal conductivity, with the experimental report validating our theoretical framework. A direct band gap of 1.17 eV is obtained using Tran Blaha modified Becke Johnson approach. The negative value of Seebeck coefficient indicates its n-type character. We purpose a strategy for enhancing power factor via carrier concentration optimization. The calculated results reveal the anisotropic transport properties. The intrinsic ultralow lattice thermal conductivity about 0.094 Wm -1 K -1 along the x-direction, and 0.019 Wm -1 K -1 along z-direction at room temperature is obtained. The ZT value can reach 0.90 (in x-direction) and 0.85 (in z-direction) for n-type doping at 900 K, indicating RbGaSb 2 as promising thermoelectric material.","PeriodicalId":0,"journal":{"name":"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.56042/ijpap.v61i9.3152","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The recent discovery of antimonide based Zintl phase compounds has sparked the research in finding high-performance thermoelectric materials. In present study, a ternary antimonide Zintl phase RbGaSb 2 is investigated using First-principles calculations. A good agreement observed between our computed results, such as lattice parameter and thermal conductivity, with the experimental report validating our theoretical framework. A direct band gap of 1.17 eV is obtained using Tran Blaha modified Becke Johnson approach. The negative value of Seebeck coefficient indicates its n-type character. We purpose a strategy for enhancing power factor via carrier concentration optimization. The calculated results reveal the anisotropic transport properties. The intrinsic ultralow lattice thermal conductivity about 0.094 Wm -1 K -1 along the x-direction, and 0.019 Wm -1 K -1 along z-direction at room temperature is obtained. The ZT value can reach 0.90 (in x-direction) and 0.85 (in z-direction) for n-type doping at 900 K, indicating RbGaSb 2 as promising thermoelectric material.