Sang Jeong Park, Seyun Kim, Okmin Park, Se Woong Lee, Sang-il Kim
{"title":"Thermoelectric Transport Properties of Co0.5Fe0.5Se2, Co0.5Fe0.5Te2, and Their Solid-Solution Compositions","authors":"Sang Jeong Park, Seyun Kim, Okmin Park, Se Woong Lee, Sang-il Kim","doi":"10.1007/s13391-023-00459-8","DOIUrl":null,"url":null,"abstract":"<div><p>Transition-metal chalcogenides with tunable electronic transport properties and unique crystal structures have attracted much attention as potential thermoelectric materials. In this study, the electrical, thermal, and thermoelectrical transport properties of Co<sub>0.5</sub>Fe<sub>0.5</sub>Se<sub>2</sub>, Co<sub>0.5</sub>Fe<sub>0.5</sub>Te<sub>2</sub> and a series of solid-solution compositions (Co<sub>0.5</sub>Fe<sub>0.5</sub>(Se<sub>1−<i>y</i></sub>Te<sub><i>y</i></sub>)<sub>2</sub>, <i>y</i> = 0.25, 0.5, and 0.75) were investigated. Co<sub>0.5</sub>Fe<sub>0.5</sub>Se<sub>2</sub> and Co<sub>0.5</sub>Fe<sub>0.5</sub>Te<sub>2</sub> polycrystalline alloys exhibited high power factors of 1.37 and 1.53 mW/mK<sup>2</sup> at 600 K, respectively, and their solid-solution compositions exhibited lower power factors between 0.38 and 0.81 mW/mK<sup>2</sup>. The lattice thermal conductivities of Co<sub>0.5</sub>Fe<sub>0.5</sub>Se<sub>2</sub> and Co<sub>0.5</sub>Fe<sub>0.5</sub>Te<sub>2</sub> were 2.87 and 1.71 W/mK at 300 K, respectively, and their solid-solution compositions exhibited lower lattice thermal conductivities between 0.96 and 1.98 W/mK. Consequently, the thermoelectric figure of merit (<i>zT</i>) of the Co<sub>0.5</sub>Fe<sub>0.5</sub>Se<sub>2</sub> and Co<sub>0.5</sub>Fe<sub>0.5</sub>Te<sub>2</sub> polycrystalline alloys was 0.16 and 0.18 at 600 K, respectively, and the <i>zT</i> of their solid-solution composition exhibited lower values between 0.04 and 0.09. As the solid-solution composition exhibited a lower thermoelectric performance than the Co<sub>0.5</sub>Fe<sub>0.5</sub>Se<sub>2</sub> and Co<sub>0.5</sub>Fe<sub>0.5</sub>Te<sub>2</sub> polycrystalline alloys, the lower thermoelectric performance was analyzed and discussed.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":536,"journal":{"name":"Electronic Materials Letters","volume":"20 4","pages":"432 - 439"},"PeriodicalIF":2.1000,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electronic Materials Letters","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s13391-023-00459-8","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Transition-metal chalcogenides with tunable electronic transport properties and unique crystal structures have attracted much attention as potential thermoelectric materials. In this study, the electrical, thermal, and thermoelectrical transport properties of Co0.5Fe0.5Se2, Co0.5Fe0.5Te2 and a series of solid-solution compositions (Co0.5Fe0.5(Se1−yTey)2, y = 0.25, 0.5, and 0.75) were investigated. Co0.5Fe0.5Se2 and Co0.5Fe0.5Te2 polycrystalline alloys exhibited high power factors of 1.37 and 1.53 mW/mK2 at 600 K, respectively, and their solid-solution compositions exhibited lower power factors between 0.38 and 0.81 mW/mK2. The lattice thermal conductivities of Co0.5Fe0.5Se2 and Co0.5Fe0.5Te2 were 2.87 and 1.71 W/mK at 300 K, respectively, and their solid-solution compositions exhibited lower lattice thermal conductivities between 0.96 and 1.98 W/mK. Consequently, the thermoelectric figure of merit (zT) of the Co0.5Fe0.5Se2 and Co0.5Fe0.5Te2 polycrystalline alloys was 0.16 and 0.18 at 600 K, respectively, and the zT of their solid-solution composition exhibited lower values between 0.04 and 0.09. As the solid-solution composition exhibited a lower thermoelectric performance than the Co0.5Fe0.5Se2 and Co0.5Fe0.5Te2 polycrystalline alloys, the lower thermoelectric performance was analyzed and discussed.
期刊介绍：
Electronic Materials Letters is an official journal of the Korean Institute of Metals and Materials. It is a peer-reviewed international journal publishing print and online version. It covers all disciplines of research and technology in electronic materials. Emphasis is placed on science, engineering and applications of advanced materials, including electronic, magnetic, optical, organic, electrochemical, mechanical, and nanoscale materials. The aspects of synthesis and processing include thin films, nanostructures, self assembly, and bulk, all related to thermodynamics, kinetics and/or modeling.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
