Abstract
Oxygen contents and thermoelectric properties of hot-pressed polycrystalline Ca 3− x Bi x Co 4O 9+ δ (0.00 < x < 0.20) samples were investigated both in Ar and air atmospheres in the temperature range 300 K < T < 870 K. Ar-annealed samples showed reduction in electrical conductivity and an elevation in Seebeck coefficient at T > 650 K with increasing x, whereas no systematic behaviour was found for the air-annealed samples. The figure-of-merit ZT at 870 K was improved from 0.12 ( x = 0.00, both air and Ar) to 0.19 ( x = 0.20, air) and 0.15 ( x = 0.20, Ar). The results mark the significance of the oxygen content when assessing the thermoelectric properties of oxide compounds.
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