Optimization of thermoelectric properties of n-type Mn- and Te-doped Mg3Sb2-xBix phases

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences Pub Date : 2025-06-12 DOI:10.1016/j.solidstatesciences.2025.108011

Trong Phan , Yu-Chih Tseng , Yurij Mozharivskyj

{"title":"Optimization of thermoelectric properties of n-type Mn- and Te-doped Mg3Sb2-xBix phases","authors":"Trong Phan , Yu-Chih Tseng , Yurij Mozharivskyj","doi":"10.1016/j.solidstatesciences.2025.108011","DOIUrl":null,"url":null,"abstract":"<div><div>This study explores the effects of Mg and Bi amounts, ball milling duration, and sintering conditions on the purity and thermoelectric properties of the Mn- and Te-doped Mg3Sb2-xBix phases (Mg2.97+yMn0.03BixSb1.99-xTe0.01). We found that excess Mg is necessary to achieve phase pure samples, but too much Mg forms impurities that decrease thermoelectric efficiency. Increasing Bi content leads to lower phase stability and decomposition. There is also an optimal ball milling time, beyond which decomposition of the material occurs. The highest figure of merit, zT, of 1.44 was achieved for the Mg3.27Mn0.03Bi1.30Sb0.69Te0.01 sample at 623K, which is comparable to the performance of Bi2Te3. Our findings suggest that Mg3Sb2-xBix phases are promising low-cost and environmentally friendly thermoelectric materials mid-range temperature applications.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"168 ","pages":"Article 108011"},"PeriodicalIF":3.4000,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solid State Sciences","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S129325582500189X","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}

引用次数: 0

Abstract

This study explores the effects of Mg and Bi amounts, ball milling duration, and sintering conditions on the purity and thermoelectric properties of the Mn- and Te-doped Mg₃Sb_2-xBi_x phases (Mg_2.97+yMn_0.03Bi_xSb_1.99-xTe_0.01). We found that excess Mg is necessary to achieve phase pure samples, but too much Mg forms impurities that decrease thermoelectric efficiency. Increasing Bi content leads to lower phase stability and decomposition. There is also an optimal ball milling time, beyond which decomposition of the material occurs. The highest figure of merit, zT, of 1.44 was achieved for the Mg_3.27Mn_0.03Bi_1.30Sb_0.69Te_0.01 sample at 623K, which is comparable to the performance of Bi₂Te₃. Our findings suggest that Mg₃Sb_2-xBi_x phases are promising low-cost and environmentally friendly thermoelectric materials mid-range temperature applications.

查看原文本刊更多论文

n型Mn和te掺杂Mg3Sb2-xBix相热电性能的优化

本研究探讨了Mg和Bi用量、球磨时间和烧结条件对Mn和te掺杂Mg3Sb2-xBix相（Mg2.97+yMn0.03BixSb1.99-xTe0.01）纯度和热电性能的影响。我们发现过量的Mg是获得相纯样品所必需的，但过多的Mg会形成杂质，降低热电效率。Bi含量的增加导致相稳定性和分解性降低。还有一个最佳球磨时间，超过这个时间，材料就会发生分解。在623K时，Mg3.27Mn0.03Bi1.30Sb0.69Te0.01样品的zT达到了1.44的最高品质值，与Bi2Te3的性能相当。我们的研究结果表明，Mg3Sb2-xBix相是一种有前景的低成本和环境友好型热电材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Solid State Sciences 化学-无机化学与核化学

CiteScore

6.60

自引率

2.90%

发文量

214

审稿时长

27 days

期刊介绍： Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments. Key topics for stand-alone papers and special issues: -Novel ways of synthesis, inorganic functional materials, including porous and glassy materials, hybrid organic-inorganic compounds and nanomaterials -Physical properties, emphasizing but not limited to the electrical, magnetical and optical features -Materials related to information technology and energy and environmental sciences. The journal publishes feature articles from experts in the field upon invitation. Solid State Sciences - your gateway to energy-related materials.