The single-phase composition and thermoelectric performance of defective half-Heusler Ti1-xNiSb prepared by levitation melting

IF 3.3 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences Pub Date : 2025-08-05 DOI:10.1016/j.solidstatesciences.2025.108040

Mengmeng Xiao , Qingying Wang , Yuanjie Qie , Sheng Qian , Shen Han , Chenguang Fu , Teng Fang , Tiejun Zhu

{"title":"The single-phase composition and thermoelectric performance of defective half-Heusler Ti1-xNiSb prepared by levitation melting","authors":"Mengmeng Xiao , Qingying Wang , Yuanjie Qie , Sheng Qian , Shen Han , Chenguang Fu , Teng Fang , Tiejun Zhu","doi":"10.1016/j.solidstatesciences.2025.108040","DOIUrl":null,"url":null,"abstract":"<div><div>The recently developed defective 19-electron half-Heusler (HH) compounds hold significant promise as high-temperature thermoelectric (TE) materials. Determining the single-phase composition of these defective 19-electron HH compounds is crucial for optimizing TE performance and ensuring their stability in applications. However, the single-phase composition of defective Ti<sub>1-<em>x</em></sub>NiSb remains a subject of debate. Here, we systematically investigated the single-phase composition and TE performance of defective HH Ti<sub>1-<em>x</em></sub>NiSb synthesized by levitation melting. Our findings reveal that the single-phase composition is influenced by the synthesis-related thermodynamics. The single-phase of samples prepared by levitation melting (0.05 < <em>x</em> < 0.10) differs significantly from that of samples prepared by arc melting (0.15 ≤ <em>x</em> ≤ 0.25), even when subjected to the same annealing conditions. The low lattice thermal conductivity, resulting from phonon scattering due to a high concentration of Ti vacancies, combined with an enhanced power factor (PF), leads to a maximum <em>zT</em> of 0.4 for Ti<sub>0.80</sub>NiSb at 1019 K, which is up to 500 % higher than that of nominal TiNiSb.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"168 ","pages":"Article 108040"},"PeriodicalIF":3.3000,"publicationDate":"2025-08-05","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/S1293255825002183","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

The recently developed defective 19-electron half-Heusler (HH) compounds hold significant promise as high-temperature thermoelectric (TE) materials. Determining the single-phase composition of these defective 19-electron HH compounds is crucial for optimizing TE performance and ensuring their stability in applications. However, the single-phase composition of defective Ti_1-xNiSb remains a subject of debate. Here, we systematically investigated the single-phase composition and TE performance of defective HH Ti_1-xNiSb synthesized by levitation melting. Our findings reveal that the single-phase composition is influenced by the synthesis-related thermodynamics. The single-phase of samples prepared by levitation melting (0.05 < x < 0.10) differs significantly from that of samples prepared by arc melting (0.15 ≤ x ≤ 0.25), even when subjected to the same annealing conditions. The low lattice thermal conductivity, resulting from phonon scattering due to a high concentration of Ti vacancies, combined with an enhanced power factor (PF), leads to a maximum zT of 0.4 for Ti_0.80NiSb at 1019 K, which is up to 500 % higher than that of nominal TiNiSb.

Abstract Image

查看原文本刊更多论文

悬浮熔融法制备缺陷半heusler Ti1-xNiSb的单相组成及热电性能

最近开发的缺陷19电子半赫斯勒（HH）化合物作为高温热电（TE）材料具有重要的前景。确定这些缺陷的19电子HH化合物的单相组成对于优化TE性能和确保其在应用中的稳定性至关重要。然而，缺陷Ti1-xNiSb的单相组成仍然是一个有争议的话题。本文系统地研究了悬浮熔融法制备的缺陷HH Ti1-xNiSb的单相组成和TE性能。我们的研究结果表明，单相组成受合成相关热力学的影响。悬浮熔融法制备样品的单相(0.05 <；x & lt;0.10)与电弧熔化制备的样品（0.15≤x≤0.25）有显著差异，即使在相同的退火条件下。由于高浓度的Ti空位导致声子散射，加上功率因数（PF）的增强，导致Ti0.80NiSb在1019 K时的最大zT为0.4，比标称TiNiSb高500%。

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.