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Zintl-phase Eu2ZnSb2: A promising thermoelectric material with ultralow thermal conductivity.

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.

SUBMITTER: Chen C 

PROVIDER: S-EPMC6386660 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature

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Zintl-phase Eu<sub>2</sub>ZnSb<sub>2</sub>: A promising thermoelectric material with ultralow thermal conductivity.

Chen Chen C   Xue Wenhua W   Li Shan S   Zhang Zongwei Z   Li Xiaofang X   Wang Xinyu X   Liu Yijie Y   Sui Jiehe J   Liu Xingjun X   Cao Feng F   Ren Zhifeng Z   Chu Ching-Wu CW   Wang Yumei Y   Zhang Qian Q  

Proceedings of the National Academy of Sciences of the United States of America 20190204 8

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 Eu<sub>2</sub>ZnSb<sub>2</sub> (<i>P</i>6<sub>3</sub>/<i>mmc</i>), was prepared and investigated. The extremely low lattice thermal conductivity is attributed to the external Eu atomic layers inserted in the [Zn<sub>2</sub>Sb<sub>2</sub>]<sup>2-</sup> network in the structure of 1-2-2-type EuZn<sub>2</su  ...[more]

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