Abstract
Layered misfit cobaltite Bi 2Ca 2.4Co 2O y has been synthesized by a sol–gel method. This compound exhibits large thermoelectric (TE) power ( S 300 K ∼170 μV K −1), low resistivity ( ρ 300 K ∼42 mΩ cm) and relatively small thermal conductivity ( κ 300 K ∼2.8 W K −1 m −1) at room temperature. Furthermore, the resistivity of this compound displays a metallic behavior above T ⁎∼150 K with a semiconducting behavior below this temperature. This abnormal behavior in resistivity is analogous to those observed in Sr and Ba based misfit cobaltites. The observed features of the TE have been discussed based on the narrow band model.
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