Observation of Anomalously High Seebeck Coefficients in the Family of Zintl Phase Semiconductors Ca10RECdSb9 (RE = Rare-Earth Metal)

Ogunbunmi, Michael O.; Bobev, Svilen

doi:10.1021/acs.chemmater.2c02103

Title: Observation of Anomalously High Seebeck Coefficients in the Family of Zintl Phase Semiconductors Ca₁₀RECdSb₉ (RE = Rare-Earth Metal)

Journal Article · Thu Sep 29 00:00:00 EDT 2022 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.2c02103· OSTI ID:1996796

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University of Delaware, Newark, DE (United States)

This work reports the synthesis, structure and thermoelectric transport properties of the hole-dominated semiconductors with a general formula Ca₁₀RECdSb₉ (RE = Y, Ce, Nd, Sm, and Lu). These materials feature unexpectedly high Seebeck coeffi-cients, up to 650 µV/K at 600 K, and electrical resistivities on the order of 1–1000 mΩ·cm, which is an indication of a degen-erate semiconducting state. For example, the Seebeck coeffi-cient observed in Ca₁₀NdCdSb₉ (309 µV/K at 600 K) is accom-panied by low and metallic-like electrical resistivity (6 mΩ·cm) and a carrier concentration n = 4.68×10²⁰ cm^–3. The calculated power factor PF in Ca₁₀NdCdSb₉ is 0.88 µW/cm·K² at 300 K, and calculations based on the single parabolic band model indi-cate that an optimum PF_opt of 1.68 μW/cm·K² can be achieved at that temperature for a carrier concentration n_opt = 6.62 × 10¹⁹ cm^–3. Here, the estimated thermoelectric figure of merit zT in this material, when properly tuned is expected to surpass zT = 1 at 600 K.

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Research Organization:: Univ. of Delaware, Newark, DE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0008885

OSTI ID:: 1996796

Journal Information:: Chemistry of Materials, Vol. 34, Issue 19; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Observation of Anomalously High Seebeck Coefficients in the Family of Zintl Phase Semiconductors Ca10RECdSb9 (RE = Rare-Earth Metal)

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Title: Observation of Anomalously High Seebeck Coefficients in the Family of Zintl Phase Semiconductors Ca₁₀RECdSb₉ (RE = Rare-Earth Metal)