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Power factors of late rare earth-doped Ca3Co2O6oxides

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
139
Issue
5
Identifiers
DOI: 10.1016/j.ssc.2006.05.033
Keywords
  • A. Thermoelectric Materials
  • D. One-Dimensional Structure

Abstract

Abstract Polycrystalline samples of (Ca 1− x R x ) 3Co 2O 6 with R = Gd, Tb, Dy and Ho at x = 0 – 0.1 were synthesized and the effects of rare earth substitution on their thermoelectric properties were investigated. In the high-temperature region, the rare earth substitution resulted in an increase in the Seebeck coefficients ( S ) , and the S values increased with decreasing ionic radius of rare earth elements in the order Gd 3+>Tb 3+>Dy 3+>Ho 3+. In contrast, the influence of rare earth substitution on the electrical resistivity was small. The high-temperature power factor was thereby improved by the late rare earth substitutions, particularly those with Ho 3+ for Ca 2+. For the Ho-doped samples ( x ≤ 0.05 ) , the power factor was significantly improved by increasing Ho concentration.

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