Influences of Bi and Cu substitutions on the power factor of Ca 3Co2O6

Kouta Iwasaki; Hisanori Yamane; Junichi Takahashi; Shunichi Kubota; Takanori Nagasaki; Yuji Arita; Yoshimasa Nishi; Tsuneo Matsui; Masahiko Shimada

doi:10.1016/j.jpcs.2004.06.087

Influences of Bi and Cu substitutions on the power factor of Ca ₃Co₂O₆

Kouta Iwasaki, Hisanori Yamane, Junichi Takahashi, Shunichi Kubota, Takanori Nagasaki, Yuji Arita, Yoshimasa Nishi, Tsuneo Matsui, Masahiko Shimada

Division of Inorganic Material Research

Research output: Contribution to journal › Conference article › peer-review

10 Citations (Scopus)

Abstract

Polycrystalline samples of Ca₃Co₂O₆-based solid solutions, (Ca_1-xBi_x)₃Co ₂O₆, Ca₃(Co_1-xCu_x) ₂O₆ and (Ca_1-xBi_x) ₃(Co_1-xCu_x)₂O₆, were prepared by solid state reaction at 1243 K in air. The single phases were obtained at x≤0.02 for (Ca_1-xBi_x)₃Co ₂O₆, Ca₃(Co_1-xCu_x) ₂O₆ and (Ca_1-xBi_x) ₃(Co_1-xCu_x)₂O₆, and the lattice parameters increased with increasing x. The electrical resistivity (ρ) of the solid solutions exhibited semiconducting behavior in 300-1170 K, and the values of electrical resistivity decreased with increasing x (3.8×10^-2 Ωcm for (Ca_0.98Bi _0.02)₃Co₂O₆, 5.7×10 ^-2 Ωcm for Ca₃(Co_0.98Cu _0.02)₂O₆ and 4.8×10^-2 Ωcm for (Ca_0.98Bi_0.02)₃(Co _0.98Cu_0.02)₂O₆ at 1170 K). Seebeck coefficient (S) of the solid solutions were smaller than that of Ca ₃Co₂O₆ below 800 K, however, the values were almost the same as that of Ca₃Co₂O₆ (around 140 μV/K) above 1000 K. The power factor (S²/ρ) tended to increase with increasing temperature and x, and the maximum values were 5.0×10^-5 W/(m K²) for (Ca_0.98Bi _0.02)₃Co₂O₆, 3.7×10 ^-5 W/(m K²) for Ca₃(Co_0.98Cu _0.02)₂O₆ and 4.0×10^-5 W/(m K²) for (Ca_0.98Bi_0.02)₃(Co _0.98Cu_0.02)₂O₆ at 1170 K.

Original language	English
Pages (from-to)	303-307
Number of pages	5
Journal	Journal of Physics and Chemistry of Solids
Volume	66
Issue number	2-4
DOIs	https://doi.org/10.1016/j.jpcs.2004.06.087
Publication status	Published - 2005 Feb

Keywords

A. Oxides
D. Electrical properties

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/j.jpcs.2004.06.087

Cite this

@article{f14cc3a5142944ce9381106f19f3c652,

title = "Influences of Bi and Cu substitutions on the power factor of Ca 3Co2O6",

abstract = "Polycrystalline samples of Ca3Co2O6-based solid solutions, (Ca1-xBix)3Co 2O6, Ca3(Co1-xCux) 2O6 and (Ca1-xBix) 3(Co1-xCux)2O6, were prepared by solid state reaction at 1243 K in air. The single phases were obtained at x≤0.02 for (Ca1-xBix)3Co 2O6, Ca3(Co1-xCux) 2O6 and (Ca1-xBix) 3(Co1-xCux)2O6, and the lattice parameters increased with increasing x. The electrical resistivity (ρ) of the solid solutions exhibited semiconducting behavior in 300-1170 K, and the values of electrical resistivity decreased with increasing x (3.8×10-2 Ωcm for (Ca0.98Bi 0.02)3Co2O6, 5.7×10 -2 Ωcm for Ca3(Co0.98Cu 0.02)2O6 and 4.8×10-2 Ωcm for (Ca0.98Bi0.02)3(Co 0.98Cu0.02)2O6 at 1170 K). Seebeck coefficient (S) of the solid solutions were smaller than that of Ca 3Co2O6 below 800 K, however, the values were almost the same as that of Ca3Co2O6 (around 140 μV/K) above 1000 K. The power factor (S2/ρ) tended to increase with increasing temperature and x, and the maximum values were 5.0×10-5 W/(m K2) for (Ca0.98Bi 0.02)3Co2O6, 3.7×10 -5 W/(m K2) for Ca3(Co0.98Cu 0.02)2O6 and 4.0×10-5 W/(m K2) for (Ca0.98Bi0.02)3(Co 0.98Cu0.02)2O6 at 1170 K.",

keywords = "A. Oxides, D. Electrical properties",

author = "Kouta Iwasaki and Hisanori Yamane and Junichi Takahashi and Shunichi Kubota and Takanori Nagasaki and Yuji Arita and Yoshimasa Nishi and Tsuneo Matsui and Masahiko Shimada",

note = "Funding Information: This work was supported by Ministry of Economy, Trade and Industry (METI), Japan, under the Synergy Ceramics Project.",

year = "2005",

month = feb,

doi = "10.1016/j.jpcs.2004.06.087",

language = "English",

volume = "66",

pages = "303--307",

journal = "Journal of Physics and Chemistry of Solids",

issn = "0022-3697",

publisher = "Elsevier Limited",

number = "2-4",

}

TY - JOUR

T1 - Influences of Bi and Cu substitutions on the power factor of Ca 3Co2O6

AU - Iwasaki, Kouta

AU - Yamane, Hisanori

AU - Takahashi, Junichi

AU - Kubota, Shunichi

AU - Nagasaki, Takanori

AU - Arita, Yuji

AU - Nishi, Yoshimasa

AU - Matsui, Tsuneo

AU - Shimada, Masahiko

N1 - Funding Information: This work was supported by Ministry of Economy, Trade and Industry (METI), Japan, under the Synergy Ceramics Project.

PY - 2005/2

Y1 - 2005/2

N2 - Polycrystalline samples of Ca3Co2O6-based solid solutions, (Ca1-xBix)3Co 2O6, Ca3(Co1-xCux) 2O6 and (Ca1-xBix) 3(Co1-xCux)2O6, were prepared by solid state reaction at 1243 K in air. The single phases were obtained at x≤0.02 for (Ca1-xBix)3Co 2O6, Ca3(Co1-xCux) 2O6 and (Ca1-xBix) 3(Co1-xCux)2O6, and the lattice parameters increased with increasing x. The electrical resistivity (ρ) of the solid solutions exhibited semiconducting behavior in 300-1170 K, and the values of electrical resistivity decreased with increasing x (3.8×10-2 Ωcm for (Ca0.98Bi 0.02)3Co2O6, 5.7×10 -2 Ωcm for Ca3(Co0.98Cu 0.02)2O6 and 4.8×10-2 Ωcm for (Ca0.98Bi0.02)3(Co 0.98Cu0.02)2O6 at 1170 K). Seebeck coefficient (S) of the solid solutions were smaller than that of Ca 3Co2O6 below 800 K, however, the values were almost the same as that of Ca3Co2O6 (around 140 μV/K) above 1000 K. The power factor (S2/ρ) tended to increase with increasing temperature and x, and the maximum values were 5.0×10-5 W/(m K2) for (Ca0.98Bi 0.02)3Co2O6, 3.7×10 -5 W/(m K2) for Ca3(Co0.98Cu 0.02)2O6 and 4.0×10-5 W/(m K2) for (Ca0.98Bi0.02)3(Co 0.98Cu0.02)2O6 at 1170 K.

AB - Polycrystalline samples of Ca3Co2O6-based solid solutions, (Ca1-xBix)3Co 2O6, Ca3(Co1-xCux) 2O6 and (Ca1-xBix) 3(Co1-xCux)2O6, were prepared by solid state reaction at 1243 K in air. The single phases were obtained at x≤0.02 for (Ca1-xBix)3Co 2O6, Ca3(Co1-xCux) 2O6 and (Ca1-xBix) 3(Co1-xCux)2O6, and the lattice parameters increased with increasing x. The electrical resistivity (ρ) of the solid solutions exhibited semiconducting behavior in 300-1170 K, and the values of electrical resistivity decreased with increasing x (3.8×10-2 Ωcm for (Ca0.98Bi 0.02)3Co2O6, 5.7×10 -2 Ωcm for Ca3(Co0.98Cu 0.02)2O6 and 4.8×10-2 Ωcm for (Ca0.98Bi0.02)3(Co 0.98Cu0.02)2O6 at 1170 K). Seebeck coefficient (S) of the solid solutions were smaller than that of Ca 3Co2O6 below 800 K, however, the values were almost the same as that of Ca3Co2O6 (around 140 μV/K) above 1000 K. The power factor (S2/ρ) tended to increase with increasing temperature and x, and the maximum values were 5.0×10-5 W/(m K2) for (Ca0.98Bi 0.02)3Co2O6, 3.7×10 -5 W/(m K2) for Ca3(Co0.98Cu 0.02)2O6 and 4.0×10-5 W/(m K2) for (Ca0.98Bi0.02)3(Co 0.98Cu0.02)2O6 at 1170 K.

KW - A. Oxides

KW - D. Electrical properties

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U2 - 10.1016/j.jpcs.2004.06.087

DO - 10.1016/j.jpcs.2004.06.087

M3 - Conference article

AN - SCOPUS:13844313843

SN - 0022-3697

VL - 66

SP - 303

EP - 307

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 2-4

ER -