TY - JOUR
T1 - Scanning transmission electron microscopy and thermoelectric properties of Sr-doped misfit cobalt oxide
AU - Morimura, Takao
AU - Sato, Yukio
AU - Ikuhara, Yuichi
AU - Yamaguchi, Takahiro
AU - Hasaka, Masayuki
PY - 2013/1
Y1 - 2013/1
N2 - In order to clarify the role of Sr doping in the themoelectric properties of Ca3Co4O9, Ca3-x SrxCo 4O9 samples were fabricated by uniaxial compression molding and sintering in atmosphere. Their thermoelectric properties and atomic-scale structures were investigated. Forx < 0:3, the dimensionless figure of merit (ZT) increases with x through a decrease in the thermal conductivity despite the nearly constant Seebeck coefficient and electrical resistivity. Scanning transmission electron microscopy images and energy-dispersive X-ray spectroscopy maps have revealed that Sr mainly substitutes in the Ca site in the rocksalt layer. These results suggest that Sr doping enhances ZT by decreasing in the rocksalt layer, but it does not significantly affect electrical properties because it is an isovalent substitution.
AB - In order to clarify the role of Sr doping in the themoelectric properties of Ca3Co4O9, Ca3-x SrxCo 4O9 samples were fabricated by uniaxial compression molding and sintering in atmosphere. Their thermoelectric properties and atomic-scale structures were investigated. Forx < 0:3, the dimensionless figure of merit (ZT) increases with x through a decrease in the thermal conductivity despite the nearly constant Seebeck coefficient and electrical resistivity. Scanning transmission electron microscopy images and energy-dispersive X-ray spectroscopy maps have revealed that Sr mainly substitutes in the Ca site in the rocksalt layer. These results suggest that Sr doping enhances ZT by decreasing in the rocksalt layer, but it does not significantly affect electrical properties because it is an isovalent substitution.
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U2 - 10.7567/JJAP.52.071101
DO - 10.7567/JJAP.52.071101
M3 - Article
AN - SCOPUS:84880989011
VL - 52
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 7 PART 1
M1 - 071101
ER -