Screening of promising thermoelectric materials from MnTe-GeTe alloying

IF 10 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Tiantian Wang , Quansheng Guo , Jianghe Feng , Juan Li , Ruiheng Liu
{"title":"Screening of promising thermoelectric materials from MnTe-GeTe alloying","authors":"Tiantian Wang ,&nbsp;Quansheng Guo ,&nbsp;Jianghe Feng ,&nbsp;Juan Li ,&nbsp;Ruiheng Liu","doi":"10.1016/j.mtphys.2025.101661","DOIUrl":null,"url":null,"abstract":"<div><div>GeTe-MnTe-based materials have been proposed as promising thermoelectric materials due to the ineluctable phase transition of GeTe materials. However, the previously reported Ge<sub>1-<em>x</em></sub>Mn<sub><em>x</em></sub>Te alloys with low MnTe content may mix with the rhombohedral phase of GeTe, making the sample unstable during thermal cycling. Moreover, the exact phase of GeTe-MnTe-based alloys have not been thoroughly studied. In this work, a series of Ge<sub>1-<em>x</em></sub>Mn<sub><em>x</em></sub>Te (0 ≤ <em>x</em> ≤ 1) compounds were synthesized, and the changes in crystal structure and thermoelectric properties were investigated across the composition range from GeTe to MnTe. At the phase boundary, both rhombohedral and cubic phases GeTe coexist in the range of <em>x</em> = 0.15 to 0.3, while cubic phase GeTe and hexagonal MnTe phases coexist for <em>x</em> = 0.5 to 0.7. The single cubic phase is observed only near <em>x</em> = 0.4. Alloying with MnTe significantly increase the effective mass of the electronic band, which negatively impacts the electrical performance, suggesting that the thermoelectric properties are compromised in favor of enhancing the stability of the GeTe structure. Although the resistivity of the alloy increases with Mn content, the Seebeck coefficient rises significantly, and thermal conductivity decreases. These changes are likely due to enhanced phonon scattering caused by the two phases and the Mn solute atoms. As a result, relatively high figure-of-merit (<em>zT</em>) values are achieved in the rhombohedral-to-cubic phase transition region (<em>x</em> = 0.15, 0.2, 0.3) for Ge<sub>1-<em>x</em></sub>Mn<sub><em>x</em></sub>Te.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101661"},"PeriodicalIF":10.0000,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Today Physics","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2542529325000173","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0

Abstract

GeTe-MnTe-based materials have been proposed as promising thermoelectric materials due to the ineluctable phase transition of GeTe materials. However, the previously reported Ge1-xMnxTe alloys with low MnTe content may mix with the rhombohedral phase of GeTe, making the sample unstable during thermal cycling. Moreover, the exact phase of GeTe-MnTe-based alloys have not been thoroughly studied. In this work, a series of Ge1-xMnxTe (0 ≤ x ≤ 1) compounds were synthesized, and the changes in crystal structure and thermoelectric properties were investigated across the composition range from GeTe to MnTe. At the phase boundary, both rhombohedral and cubic phases GeTe coexist in the range of x = 0.15 to 0.3, while cubic phase GeTe and hexagonal MnTe phases coexist for x = 0.5 to 0.7. The single cubic phase is observed only near x = 0.4. Alloying with MnTe significantly increase the effective mass of the electronic band, which negatively impacts the electrical performance, suggesting that the thermoelectric properties are compromised in favor of enhancing the stability of the GeTe structure. Although the resistivity of the alloy increases with Mn content, the Seebeck coefficient rises significantly, and thermal conductivity decreases. These changes are likely due to enhanced phonon scattering caused by the two phases and the Mn solute atoms. As a result, relatively high figure-of-merit (zT) values are achieved in the rhombohedral-to-cubic phase transition region (x = 0.15, 0.2, 0.3) for Ge1-xMnxTe.
求助全文
约1分钟内获得全文 求助全文
来源期刊
Materials Today Physics
Materials Today Physics Materials Science-General Materials Science
CiteScore
14.00
自引率
7.80%
发文量
284
审稿时长
15 days
期刊介绍: Materials Today Physics is a multi-disciplinary journal focused on the physics of materials, encompassing both the physical properties and materials synthesis. Operating at the interface of physics and materials science, this journal covers one of the largest and most dynamic fields within physical science. The forefront research in materials physics is driving advancements in new materials, uncovering new physics, and fostering novel applications at an unprecedented pace.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信