Abstract
Cobalt antimonide (CoSb) in the stoichiometric ratio of 1:1 was synthesized by the microwave induced plasma heating method at the power of 1000 watt for 5, 15 and 30 min. The evolution of phases and lattice parameters of the synthetized CoSb thermoelectric materials were investigated using X-ray diffractometer (XRD), and analyzed by the Rietveld method with the FullProf Suite software. A single phase of CoSb with the lattice parameters of a = b = 3.8747 Å and c = 5.1717 Å was obtained at the synthesized time of 30 min. The optical properties were also measured by the UV-VIS spectrophotometer which could be used to determine the direct and indirect energy gaps as 4.15 eV and 3.85 eV, respectively. The electrical properties of the consolidated CoSb were subsequently measured from the temperature range of 50–500°C by ZEM-3 device. The electrical resistivity and power factor showed the increasing tendency with increasing temperature, while the Seebeck coefficient showed the results in the opposite way.
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