Doping effect in Ca3Co4−xZnxOy ceramics
Source abstract
Abstract
Ca3Co4-xZnxOy (x = 0.01, 0.03, and 0.05) polycrystalline thermoelectric ceramics have been prepared by the classical solid state method. XRD data have shown that Ca3Co 4O9 is the major phase, with small amounts of the Ca 3Co2O6 one. Moreover, it has been found that the Zn has been incorporated into these two phases. Slight Zn doping decreases electrical resistivity compared with the values obtained in undoped samples. The minimum values have been obtained for the 0.01-Ni doped samples, increasing for further Zn substitution. Seebeck coefficient does not appreciably change in all the measured temperature range, independently of Zn content. The improvement in electrical resistivity leads to higher power factor values for the 0.01 Zn-doped samples (about 30 %) than for the undoped ones. The maximum power factor at 800 °C, around 0.27 mW/K2 m is significantly higher than the best results obtained in Zn doped samples reported in the literature. © 2014 Springer Science+Business Media New York.
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Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal Expansion and Ionic Conductivity · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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