Abstract
We have investigated the crystal structure and high temperature thermoelectric properties of polycrystalline Bi2–2xNa2xSr2Co2−xWxOy (0 ≤ x ≤ 0.075) samples. Powder x-ray diffraction data show that all samples are phase pure consisting of misfit-layered structure of alternately stacked hexagonal CoO2 and double rock-salt BiSrO2 layers. It is found that dual doping of Na and W in Bi2Sr2Co2Oy system is fairly effective in improving the thermoelectric properties owing to simultaneous decrease of electrical resistivity (ρ) and thermal conductivity (κ) of samples. All samples exhibit a large Seebeck coefficient (S), which seems not to be affected by the level of doping. As a result, a very high power factor (PF) of 2.82 × 10−4 W/m K2 has been obtained for x = 0.025 sample at 1000 K. The corresponding dimensionless figure of merit (zT) for this sample has been determined to be 0.35 at 1000 K, which is ∼ 2.2 times higher than zT value of the pristine sample providing a promising class of material for high-temperature thermoelectric applications.
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Acknowledgments
We are thankful to the Higher Education Commission (HEC) of Pakistan (Grant No.: 1981), and the International Research Support Initiative Program of HEC for providing financial support. UH is grateful to the Department of Energy Conversion and Storage, Technical University of Denmark (DTU) for supporting her research visit.
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Hira, U., Pryds, N. & Sher, F. Thermoelectric Properties of Dual Doped Bi2Sr2Co2Oy-Based Ceramics. J. Electron. Mater. 48, 4618–4626 (2019). https://doi.org/10.1007/s11664-019-07252-0
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DOI: https://doi.org/10.1007/s11664-019-07252-0