Abstract
Single crystals of Bi and Cu-doped Ca 3 Co 2 O 6 were synthesized in a molten K 2 CO 3 flux. Using an obtained single crystal of (Ca 0.985(5) Bi 0.015(5) ) 3 (Co 0.990(3) Cu 0.010(3) ) 2 O 6 elongated to the c-axis direction of the crystal structure, the electric resistivity (p) and Seebeck coefficient (S) were measured from room temperature to over 1000 K in air. The single crystal showed p-type semiconducting behavior with p values of 1.8 Ωcm at 303 K and 0.017 Qcm at 1000 K. The S values were +254 μVK -1 at 325 K, +360 μVK -1 at 420 K, and +214 μVK -1 at 1000 K. The power factor (S 2 ρ -1 ) increased with an increase of temperature and attained 2.70× 10 -4 Wm -1 K- 2 at 1000 K.
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