Ba2-xBixCoRuO6 (0.0≤ x ≤0.6) hexagonal double-perovskite-type oxides as promising p-type thermoelectric materials
Date
06/12/2021Metadata
Show full item recordAbstract
A new series of Ba2–xBixCoRuO6 (0.0 ≤ x ≤ 0.6) hexagonal double perovskite oxides have been synthesized by a solid-state reaction method by substituting Ba with Bi. The polycrystalline materials are structurally characterized by the laboratory X-ray diffraction, synchrotron X-ray, and neutron powder diffraction. The lattice parameters are found to increase with increasing Bi doping despite the smaller ionic radius of Bi3+ compared to Ba2+. The expansion is attributed to the reduction of Co/Ru-site cations. Scanning electron microscopy further shows that the grain size increases with the Bi content. All Ba2–xBixCoRuO6 (0.0 ≤ x ≤ 0.6) samples exhibit p-type behavior, and the electrical resistivity (ρ) is consistent with a small polaron hopping model. The Seebeck coefficient (S) and thermal conductivity (κ) are improved significantly with Bi doping. High values of the power factor (PF ∼ 6.64 × 10–4 W/m·K2) and figure of merit (zT ∼ 0.23) are obtained at 618 K for the x = 0.6 sample. These results show that Bi doping is an effective approach for enhancing the thermoelectric properties of hexagonal Ba2–xBixCoRuO6 perovskite oxides.
Citation
Hira , U , Bos , J-W G , Missyul , A , Fauth , F , Pryds , N & Sher , F 2021 , ' Ba 2-x Bi x CoRuO 6 (0.0≤ x ≤0.6) hexagonal double-perovskite-type oxides as promising p-type thermoelectric materials ' , Inorganic Chemistry , vol. 60 , no. 23 , pp. 17824-17836 . https://doi.org/10.1021/acs.inorgchem.1c02442
Publication
Inorganic Chemistry
Status
Peer reviewed
ISSN
0020-1669Type
Journal article
Description
Funding: The authors are thankful to the Higher Education Commission of Pakistan (Grant 1981) and the British Council, United Kingdom, for providing financial support to this research project. Synchrotron experiments were performed at the ALBA Synchrotron during U.H.’s 3-month stay granted by the OPEN SESAME fellowship training within the Horizon 2020 project framework. NPD experiments at ILL were performed through the EASY access program (EASY-320 proposal). U.H. is grateful to the Department of Energy Conversion and Storage, Technical University of Denmark, for supporting her research visit.Collections
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