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- W4243284706 abstract "Abstract In the present study, thermoelectric Bi 2 Ca 2 − x K x Co 2 O y ceramic materials (x = 0.0, 0.05, 0.075, 0.10, and 0.125) in different forms (called bulk, as-grown and annealed fibers) have been manufactured via a classical solid-state method and textured using the laser floating zone (LFZ) technique. The identification and characteristics of undoped and doped samples were determined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD patterns of all samples have shown great similarity, and the major peaks can be assigned to the Bi 2 Sr 2 Co 2 O y thermoelectric phase, independently of the processing technique and K-doping. SEM-EDS have indicated the randomly oriented plate like grains of different sizes in bulk sample, evolving to longer and well-oriented grain structure through K-doping and LFZ. Because of the incongruent melting properties of compound, the high number of secondary phases formed in the as-grown samples. In order to reduce it, an annealing and K-doping process have been applied. The microstructural evolution is reflected on the electrical properties, and the lowest resistivity values are found in the annealed K-doped fibers. Seebeck coefficient is positive in all cases, pointing out to p-type conduction mechanism. These modifications led to PF values up to 0.162 mW/K 2 m, obtained in 0.10 K-doped annealed fibers at 650 o C." @default.
- W4243284706 created "2022-05-12" @default.
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- W4243284706 date "2021-06-11" @default.
- W4243284706 modified "2023-10-01" @default.
- W4243284706 title "Tuning Thermoelectric Properties of Bi2Ca2Co2Oy through K doping and Laser Floating Zone processing" @default.
- W4243284706 doi "https://doi.org/10.21203/rs.3.rs-607259/v1" @default.
- W4243284706 hasPublicationYear "2021" @default.
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