期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 116, 期 8, 页码 2831-2836出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1819157116
关键词
thermoelectric properties; Zintl phase; low thermal conductivity; Eu2ZnSb2
资金
- National Natural Science Foundation of China [11674078, 11474329, 51871081]
- Shenzhen Fundamental Research Projects [JCYJ20170811155832192, JCYJ20160427184825558]
- Startup Foundation from Shenzhen
- Startup Foundation from Harbin Institute of Technology (Shenzhen)
- US Air Force Office of Scientific Research Grant [FA9550-15-1-0236]
- T. L. L. Temple Foundation
- State of Texas through the Texas Center for Superconductivity at the University of Houston
- John J. and Rebecca Moores Endowment
- US Department of Energy [DE-SC0010831]
Zintl compounds are considered to be potential thermoelectric materials due to their phonon glass electron crystal (PGEC) structure. A promising Zintl-phase thermoelectric material, 2-1-2-type Eu2ZnSb2 (P6(3)/mmc), was prepared and investigated. The extremely low lattice thermal conductivity is attributed to the external Eu atomic layers inserted in the [Zn2Sb2](2-) network in the structure of 1-2-2-type EuZn2Sb2 (P (3) over bar m1), as well as the abundant inversion domain boundary. By regulating the Zn deficiency, the electrical properties are significantly enhanced, and the maximum ZT value reaches similar to 1.0 at 823 K for Eu2Zn0.98Sb2. Our discovery provides a class of Zintl thermoelectric materials applicable in the medium-temperature range.
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