Microstructure and high-temperature thermoelectric properties of polycrystalline CuAl1-xMgxO2 ceramics

K. Park; K. Y. Ko; J. K. Seong; S. Nahm

doi:10.1016/j.jeurceramsoc.2007.02.030

Microstructure and high-temperature thermoelectric properties of polycrystalline CuAl_1-xMg_xO₂ ceramics

K. Park, K. Y. Ko, J. K. Seong, S. Nahm

Department of Materials Science and Engineering

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

7 Citations (Scopus)

Abstract

We investigated the effect of Mg-substitution on the microstructure and high-temperature thermoelectric properties of CuAl_1-xMg_xO₂ (0 ≤ x ≤ 0.2) fabricated by the tape casting method. The sintered CuAl_1-xMg_xO₂ bodies crystallized in CuAl_1-xMg_xO₂ solid solutions along with MgAl₂O₄ and Cu₂MgO₃ phases. Mg substitution up to x = 0.12 in the CuAl_1-xMg_xO₂ yielded a higher electrical conductivity and lower Seebeck coefficient mainly because of an enhanced carrier density. The highest value of the power factor (3.47 × 10^-5 W m^-1 K^-2) was attained for CuAl_0.88Mg_0.12O₂ at 800 °C. It is demonstrated that Mg substitution is highly effective for improving high-temperature thermoelectric properties.

Original language	English
Pages (from-to)	3735-3738
Number of pages	4
Journal	Journal of the European Ceramic Society
Volume	27
Issue number	13-15
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2007.02.030
Publication status	Published - 2007

Keywords

Electrical conductivity
Electron microscopy
MgO
Pressing
Sintering

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/j.jeurceramsoc.2007.02.030

Cite this

@article{cb86b59d374449278e1dd51ddb8a3ec9,

title = "Microstructure and high-temperature thermoelectric properties of polycrystalline CuAl1-xMgxO2 ceramics",

abstract = "We investigated the effect of Mg-substitution on the microstructure and high-temperature thermoelectric properties of CuAl1-xMgxO2 (0 ≤ x ≤ 0.2) fabricated by the tape casting method. The sintered CuAl1-xMgxO2 bodies crystallized in CuAl1-xMgxO2 solid solutions along with MgAl2O4 and Cu2MgO3 phases. Mg substitution up to x = 0.12 in the CuAl1-xMgxO2 yielded a higher electrical conductivity and lower Seebeck coefficient mainly because of an enhanced carrier density. The highest value of the power factor (3.47 × 10-5 W m-1 K-2) was attained for CuAl0.88Mg0.12O2 at 800 °C. It is demonstrated that Mg substitution is highly effective for improving high-temperature thermoelectric properties.",

keywords = "Electrical conductivity, Electron microscopy, MgO, Pressing, Sintering",

author = "K. Park and Ko, {K. Y.} and Seong, {J. K.} and S. Nahm",

note = "Funding Information: The authors would like to acknowledge the financial support provided for this research by the Korea Energy Management Corporation (KEMCO). ",

year = "2007",

doi = "10.1016/j.jeurceramsoc.2007.02.030",

language = "English",

volume = "27",

pages = "3735--3738",

journal = "Journal of the European Ceramic Society",

issn = "0955-2219",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Microstructure and high-temperature thermoelectric properties of polycrystalline CuAl1-xMgxO2 ceramics

AU - Park, K.

AU - Ko, K. Y.

AU - Seong, J. K.

AU - Nahm, S.

N1 - Funding Information: The authors would like to acknowledge the financial support provided for this research by the Korea Energy Management Corporation (KEMCO).

PY - 2007

Y1 - 2007

N2 - We investigated the effect of Mg-substitution on the microstructure and high-temperature thermoelectric properties of CuAl1-xMgxO2 (0 ≤ x ≤ 0.2) fabricated by the tape casting method. The sintered CuAl1-xMgxO2 bodies crystallized in CuAl1-xMgxO2 solid solutions along with MgAl2O4 and Cu2MgO3 phases. Mg substitution up to x = 0.12 in the CuAl1-xMgxO2 yielded a higher electrical conductivity and lower Seebeck coefficient mainly because of an enhanced carrier density. The highest value of the power factor (3.47 × 10-5 W m-1 K-2) was attained for CuAl0.88Mg0.12O2 at 800 °C. It is demonstrated that Mg substitution is highly effective for improving high-temperature thermoelectric properties.

AB - We investigated the effect of Mg-substitution on the microstructure and high-temperature thermoelectric properties of CuAl1-xMgxO2 (0 ≤ x ≤ 0.2) fabricated by the tape casting method. The sintered CuAl1-xMgxO2 bodies crystallized in CuAl1-xMgxO2 solid solutions along with MgAl2O4 and Cu2MgO3 phases. Mg substitution up to x = 0.12 in the CuAl1-xMgxO2 yielded a higher electrical conductivity and lower Seebeck coefficient mainly because of an enhanced carrier density. The highest value of the power factor (3.47 × 10-5 W m-1 K-2) was attained for CuAl0.88Mg0.12O2 at 800 °C. It is demonstrated that Mg substitution is highly effective for improving high-temperature thermoelectric properties.

KW - Electrical conductivity

KW - Electron microscopy

KW - MgO

KW - Pressing

KW - Sintering

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U2 - 10.1016/j.jeurceramsoc.2007.02.030

DO - 10.1016/j.jeurceramsoc.2007.02.030

M3 - Article

AN - SCOPUS:34347355435

SN - 0955-2219

VL - 27

SP - 3735

EP - 3738

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 13-15

ER -