| Literature DB >> 30718395 |
Chen Chen1,2, Wenhua Xue3, Shan Li1,2, Zongwei Zhang1,2, Xiaofang Li1,2, Xinyu Wang1,2, Yijie Liu4, Jiehe Sui5, Xingjun Liu1,2,5, Feng Cao4, Zhifeng Ren6, Ching-Wu Chu7, Yumei Wang8, Qian Zhang9,2.
Abstract
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 (P63/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 [Formula: see text], 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 ∼1.0 at 823 K for Eu2Zn0.98Sb2 Our discovery provides a class of Zintl thermoelectric materials applicable in the medium-temperature range.Entities:
Keywords: Eu2ZnSb2; Zintl phase; low thermal conductivity; thermoelectric properties
Year: 2019 PMID： 30718395 PMCID： PMC6386660 DOI： 10.1073/pnas.1819157116
Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN： 0027-8424 Impact factor: 11.205