journal article·2019-10-16

Enhanced Thermoelectric Performance of Zintl Phase Ca9Zn4+xSb9 by Beneficial Disorder on the Selective Cationic Site

Chen Chen, Wenhua Xue, Xiaofang Li, Yucheng Lan, Zongwei Zhang, Xinyu Wang, Fan Zhang, Honghao Yao, Shan Li, Jiehe Sui, Peide Han, Xingjun Liu, Feng Cao, Yumei Wang, Qian Zhang

ACS Applied Materials & Interfaces· Volume 11· Issue 41
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Abstract

Zintl phase compounds Ca9Zn4+xSb9 have promising thermoelectric properties due to their complex crystal structure and tunable interstitial Zn. In this work, we prepared nominal Ca9Zn4+xSb9 (x = 0.5, 0.6, 0.7, and 0.8) using ball milling and hot pressing. Further decreased lattice thermal conductivity was obtained by isoelectronic substitution of Eu on the selective Ca site, which is farther away from the framework of [Zn4+xSb9]δ− for the smaller disturbance of carrier transport. Together with the intensively enhanced carrier mobility, which is attributed to the decreased effective mass and the increased interstitial Zn by inclusion of Eu, an increased peak ZT value to ∼1.05 at 773 K and an enhanced average ZT value to ∼0.73 from 300 to 823 K were achieved in Ca6.75Eu2.25Zn4.7Sb9.
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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Optical properties and cooling technologies in crystalline materials · Thermal Expansion and Ionic Conductivity

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering and Institute of Materials Genome & Big Data, Harbin Institute of Technology, Shenzhen 518055, P.R. China

Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing 100190, P.R. China

Department of Physics and Engineering Physics, Morgan State University, Baltimore, Maryland 21254, United States

State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, P.R. China

School of Science, Harbin Institute of Technology, Shenzhen 518055, P.R. China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Shenzhen Fundamental Research Projects · Shenzhen Science and Technology Innovation Projects · Harbin Institute of Technology(Shenzhen Campus) · Startup Foundation from Shenzhen

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