Thermoelectric properties of Bi and Cu co-doped Ca3Co 2O6single crystals

Junichi Takahashi, Masahiko Shimada, Kouta Iwasaki, Hisanori Yaname

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7 Citations (Scopus)


Single crystals of Bi and Cu-doped Ca3Co2O 6were synthesized in a molten K2CO3flux. Using an obtained single crystal of (Ca0.985(5)Bi0.015(5)) 3(Co0.990(3)Cu0.010(3))2O 6elongated to the c-axis direction of the crystal structure, the electric resistivity (ρ) and Seebeck coefficient (S) were measured from room temperature to over 1000 K in air. The single crystal showed p-type semiconducting behavior with ρ values of 1.8 Ω cm at 303 K and 0.017 Ω cm at 1000 K. The S values were +254 μ VK- 1 at 325 K, +360 μ VK- 1 at 420 K, and +214 μ VK- 1 at 1000 K. The power factor (S 2 ρ - 1) increased with an increase of temperature and attained 2.70 × 10- 4 Wm - 1K- 2 at 1000 K.

Original languageEnglish
Pages (from-to)95-98
Number of pages4
JournalJournal of Electroceramics
Issue number1
Publication statusPublished - 2006 Sept


  • CaCoO
  • Power factor
  • Single crystals
  • Thermoelectric materials


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