Property-processing relations in developing thermoelectric ceramics: Na1-x Co2O4

Hiroo Yamakawa; Soonil Lee; Hiroshi Takagi; Clive A. Randall

doi:10.1007/s10853-010-5039-6

Property-processing relations in developing thermoelectric ceramics: Na_1-x Co₂O₄

Hiroo Yamakawa
, Soonil Lee
, Hiroshi Takagi
, Clive A. Randall

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

6 Scopus citations

Abstract

Polycrystalline Na_1-x Co₂O₄ is a promising p-type oxide thermoelectric, and it was investigated in a property-processing study to enhance the thermoelectric properties for high temperature applications. The density of the ceramics was improved by a post-milling process, and consequently, we obtained better thermoelectric power factors (PF) due to an associated improvement in electrical conductivity. Through a milling process, and sintering at 1203 K, we obtained an enhanced thermoelectric power factor of ~4 μW/cm K² at 500 K for randomly orientated polycrystalline ceramics. The Seebeck coefficient variation with temperature demonstrates through modeling that the conduction mechanism changed from metallic to a semiconducting behavior between temperatures 300 to 400 K.

Original language	English (US)
Pages (from-to)	2064-2070
Number of pages	7
Journal	Journal of Materials Science
Volume	46
Issue number	7
DOIs	https://doi.org/10.1007/s10853-010-5039-6
State	Published - Apr 2011

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Ceramics and Composites
Mechanical Engineering
Polymers and Plastics
General Materials Science
Materials Science (miscellaneous)

Access to Document

10.1007/s10853-010-5039-6

Cite this

@article{032717db3b1f420ebafea78bd8c029e7,

title = "Property-processing relations in developing thermoelectric ceramics: Na1-x Co2O4",

abstract = "Polycrystalline Na1-x Co2O4 is a promising p-type oxide thermoelectric, and it was investigated in a property-processing study to enhance the thermoelectric properties for high temperature applications. The density of the ceramics was improved by a post-milling process, and consequently, we obtained better thermoelectric power factors (PF) due to an associated improvement in electrical conductivity. Through a milling process, and sintering at 1203 K, we obtained an enhanced thermoelectric power factor of \textasciitilde{}4 μW/cm K2 at 500 K for randomly orientated polycrystalline ceramics. The Seebeck coefficient variation with temperature demonstrates through modeling that the conduction mechanism changed from metallic to a semiconducting behavior between temperatures 300 to 400 K.",

author = "Hiroo Yamakawa and Soonil Lee and Hiroshi Takagi and Randall, \{Clive A.\}",

note = "Funding Information: Acknowledgements This study is based upon work supported by the National Science Foundation, as part of the Center for Dielectric Studies under Grant No. 0628817. The authors wish to acknowledge the CDS membership and NSF I/UCRC program for support on this topic.",

year = "2011",

month = apr,

doi = "10.1007/s10853-010-5039-6",

language = "English (US)",

volume = "46",

pages = "2064--2070",

journal = "Journal of Materials Science",

issn = "0022-2461",

publisher = "Springer",

number = "7",

}

TY - JOUR

T1 - Property-processing relations in developing thermoelectric ceramics

T2 - Na1-x Co2O4

AU - Yamakawa, Hiroo

AU - Lee, Soonil

AU - Takagi, Hiroshi

AU - Randall, Clive A.

N1 - Funding Information: Acknowledgements This study is based upon work supported by the National Science Foundation, as part of the Center for Dielectric Studies under Grant No. 0628817. The authors wish to acknowledge the CDS membership and NSF I/UCRC program for support on this topic.

PY - 2011/4

Y1 - 2011/4

N2 - Polycrystalline Na1-x Co2O4 is a promising p-type oxide thermoelectric, and it was investigated in a property-processing study to enhance the thermoelectric properties for high temperature applications. The density of the ceramics was improved by a post-milling process, and consequently, we obtained better thermoelectric power factors (PF) due to an associated improvement in electrical conductivity. Through a milling process, and sintering at 1203 K, we obtained an enhanced thermoelectric power factor of ~4 μW/cm K2 at 500 K for randomly orientated polycrystalline ceramics. The Seebeck coefficient variation with temperature demonstrates through modeling that the conduction mechanism changed from metallic to a semiconducting behavior between temperatures 300 to 400 K.

AB - Polycrystalline Na1-x Co2O4 is a promising p-type oxide thermoelectric, and it was investigated in a property-processing study to enhance the thermoelectric properties for high temperature applications. The density of the ceramics was improved by a post-milling process, and consequently, we obtained better thermoelectric power factors (PF) due to an associated improvement in electrical conductivity. Through a milling process, and sintering at 1203 K, we obtained an enhanced thermoelectric power factor of ~4 μW/cm K2 at 500 K for randomly orientated polycrystalline ceramics. The Seebeck coefficient variation with temperature demonstrates through modeling that the conduction mechanism changed from metallic to a semiconducting behavior between temperatures 300 to 400 K.

UR - https://www.scopus.com/pages/publications/79751533649

UR - https://www.scopus.com/pages/publications/79751533649#tab=citedBy

U2 - 10.1007/s10853-010-5039-6

DO - 10.1007/s10853-010-5039-6

M3 - Article

AN - SCOPUS:79751533649

SN - 0022-2461

VL - 46

SP - 2064

EP - 2070

JO - Journal of Materials Science

JF - Journal of Materials Science

IS - 7

ER -

Property-processing relations in developing thermoelectric ceramics: Na_1-x Co₂O₄

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this