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Rb(Zn,Cu)₄As₃ as a New High-Efficiency Thermoelectric Material.

ABSTRACT: The thermoelectric performance of RbZn_4-xCu_xAs₃ crystallized in the KCu₄S₃-type structure was investigated. Samples were synthesized via solid-state reactions, followed by hot pressing. Hole carriers were doped by substituting Zn with Cu until x = 0.02, resulting in an increase of the power factor from 0.049 to 0.52 mW/mK² at T = 797 K. The lattice thermal conductivity was substantially low, with a value of 1.61 W/mK at T = 312 K, independent of doping. This can be attributed to the large vibration of the Rb atoms, as demonstrated by the neutron diffraction analysis. The maximum dimensionless figure of merit, ZT, was 0.53 at T = 797 K, representing the highest value for the 143-Zintl compounds. The result indicated that the 143-Zintl compounds could be a new class of high-performance thermoelectric materials.

SUBMITTER: Ono K

PROVIDER: S-EPMC10652267 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature

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Rb(Zn,Cu)4As3 as a New High-Efficiency Thermoelectric Material.

Ono Keigo K Kihou Kunihiro K Usui Hidetomo H Kuroki Kazuhiko K Goto Yosuke Y Lee Chul-Ho CH

ACS omega 20231030 45

The thermoelectric performance of RbZn4-xCuxAs3 crystallized in the KCu4S3-type structure was investigated. Samples were synthesized via solid-state reactions, followed by hot pressing. Hole carriers were doped by substituting Zn with Cu until x = 0.02, resulting in an increase of the power factor from 0.049 to 0.52 mW/mK2 at T = 797 K. The lattice thermal conductivity was substantially low, with a valu ...[more]

PMID: 38024771

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