文章基本信息

标题：Zintl-phase Eu2ZnSb2: A promising thermoelectric material with ultralow thermal conductivity
作者：Chen Chen ; Chen Chen ; Wenhua Xue 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2019
卷号：116
期号：8
页码：2831-2836
DOI：10.1073/pnas.1819157116
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：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 ( P 6₃/ 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 ¯ m 1 ) , 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 Eu₂Zn_0.98Sb₂. Our discovery provides a class of Zintl thermoelectric materials applicable in the medium-temperature range.
关键词：thermoelectric properties ; Zintl phase ; low thermal conductivity ; Eu₂ZnSb₂