Preparation and low-temperature thermoelectric properties of the composite crystal [Ca2(Co0.65Cu0.35)2 O4]0.624CoO2

Yuzuru Miyazaki; Tatsuro Miura; Yasuhiro Ono; Tsuyoshi Kajitani

Preparation and low-temperature thermoelectric properties of the composite crystal [Ca₂(Co_0.65Cu_0.35)₂ O₄]_0.624CoO₂

Yuzuru Miyazaki, Tatsuro Miura, Yasuhiro Ono, Tsuyoshi Kajitani

ENG - Applied Physics

Research output: Contribution to journal › Letter › peer-review

64 Citations (Scopus)

Abstract

A new composite crystal cobaltite, [Ca₂(Co_0.65Cu_0.35)₂ O₄]_0.624CoO₂, has been synthesized and its thermoelectric properties below 300 K have been investigated. The compound consists of a CdI₂-type CoO₂ conduction sheet and a quadruplicated rock-salt-type [Ca₂(Co_0.65Cu_0.35)₂O₄] layer alternatively stacked along the c-axis. Metallic conductivity accompanied by large thermoelectric power (S) has been observed down to 100 K. At 300 K, the sample exhibits S = 150 μV·K^-1 and resistivity of ρ = 15 mω·cm. The resulting power factor (S₂/ρ) becomes 1.5 × 10_-4 W·K^-2 at 300 K, which is more than 20% larger than the value reported for a polycrystalline sample of another composite crystal, [Ca₂CoO₃]_0.62 CoO₂.

Original language	English
Journal	Japanese Journal of Applied Physics, Part 2: Letters
Volume	41
Issue number	7 B
Publication status	Published - 2002 Jul 15

Keywords

Calcium cobalt copper oxide
Composite crystal
Electric resistivity
Power factor
Thermoelectric power

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy (miscellaneous)
Physics and Astronomy(all)

Cite this

@article{afd2b7fab4d441599a45e6c73f225902,

title = "Preparation and low-temperature thermoelectric properties of the composite crystal [Ca2(Co0.65Cu0.35)2 O4]0.624CoO2",

abstract = "A new composite crystal cobaltite, [Ca2(Co0.65Cu0.35)2 O4]0.624CoO2, has been synthesized and its thermoelectric properties below 300 K have been investigated. The compound consists of a CdI2-type CoO2 conduction sheet and a quadruplicated rock-salt-type [Ca2(Co0.65Cu0.35)2O4] layer alternatively stacked along the c-axis. Metallic conductivity accompanied by large thermoelectric power (S) has been observed down to 100 K. At 300 K, the sample exhibits S = 150 μV·K-1 and resistivity of ρ = 15 mω·cm. The resulting power factor (S2/ρ) becomes 1.5 × 10-4 W·K-2 at 300 K, which is more than 20% larger than the value reported for a polycrystalline sample of another composite crystal, [Ca2CoO3]0.62 CoO2.",

keywords = "Calcium cobalt copper oxide, Composite crystal, Electric resistivity, Power factor, Thermoelectric power",

author = "Yuzuru Miyazaki and Tatsuro Miura and Yasuhiro Ono and Tsuyoshi Kajitani",

year = "2002",

month = jul,

day = "15",

language = "English",

volume = "41",

journal = "Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes",

issn = "0021-4922",

publisher = "Japan Society of Applied Physics",

number = "7 B",

}

TY - JOUR

T1 - Preparation and low-temperature thermoelectric properties of the composite crystal [Ca2(Co0.65Cu0.35)2 O4]0.624CoO2

AU - Miyazaki, Yuzuru

AU - Miura, Tatsuro

AU - Ono, Yasuhiro

AU - Kajitani, Tsuyoshi

PY - 2002/7/15

Y1 - 2002/7/15

N2 - A new composite crystal cobaltite, [Ca2(Co0.65Cu0.35)2 O4]0.624CoO2, has been synthesized and its thermoelectric properties below 300 K have been investigated. The compound consists of a CdI2-type CoO2 conduction sheet and a quadruplicated rock-salt-type [Ca2(Co0.65Cu0.35)2O4] layer alternatively stacked along the c-axis. Metallic conductivity accompanied by large thermoelectric power (S) has been observed down to 100 K. At 300 K, the sample exhibits S = 150 μV·K-1 and resistivity of ρ = 15 mω·cm. The resulting power factor (S2/ρ) becomes 1.5 × 10-4 W·K-2 at 300 K, which is more than 20% larger than the value reported for a polycrystalline sample of another composite crystal, [Ca2CoO3]0.62 CoO2.

AB - A new composite crystal cobaltite, [Ca2(Co0.65Cu0.35)2 O4]0.624CoO2, has been synthesized and its thermoelectric properties below 300 K have been investigated. The compound consists of a CdI2-type CoO2 conduction sheet and a quadruplicated rock-salt-type [Ca2(Co0.65Cu0.35)2O4] layer alternatively stacked along the c-axis. Metallic conductivity accompanied by large thermoelectric power (S) has been observed down to 100 K. At 300 K, the sample exhibits S = 150 μV·K-1 and resistivity of ρ = 15 mω·cm. The resulting power factor (S2/ρ) becomes 1.5 × 10-4 W·K-2 at 300 K, which is more than 20% larger than the value reported for a polycrystalline sample of another composite crystal, [Ca2CoO3]0.62 CoO2.

KW - Calcium cobalt copper oxide

KW - Composite crystal

KW - Electric resistivity

KW - Power factor

KW - Thermoelectric power

UR - http://www.scopus.com/inward/record.url?scp=0037101307&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037101307&partnerID=8YFLogxK

M3 - Letter

AN - SCOPUS:0037101307

VL - 41

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 B

ER -

Preparation and low-temperature thermoelectric properties of the composite crystal [Ca₂(Co_0.65Cu_0.35)₂ O₄]_0.624CoO₂

Abstract

Keywords

ASJC Scopus subject areas

Other files and links

Fingerprint

Cite this