Thermoelectric properties of Gd, Y co-doped Ca3Co4O9+δ

H. Q. Liu; X. B. Zhao; T. J. Zhu; Y. Song; F. P. Wang

doi:10.1016/j.cap.2008.03.010

Thermoelectric properties of Gd, Y co-doped Ca₃Co₄O_9+δ

H. Q. Liu^*
, X. B. Zhao
, T. J. Zhu
, Y. Song
, F. P. Wang

^*Corresponding author for this work

School of Chemistry and Chemical Engineering

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

72 Scopus citations

Abstract

The Ca_3-x-yGd_xY_yCo₄O_9+δ precursor powders were synthesized by the polyacrylamide gel method. The powders were sintered by the spark plasma sintering (SPS). The DTA analysis showed that the synthesis temperature of Ca₃Co₄O_9+δ was about 933 K, which is lower than that of the conventional citric acid method. The resistivities, the Seebeck coefficients and the thermal conductivities of the samples were measured from room temperature to 973 K. The Seebeck coefficients and the resistivities of the doped samples were remarkably enhanced due to the decrease of the carrier concentration, whereas the thermal conductivities of them were decreased due to the impurity scattering effect. The maximal ZT value of 0.26 was obtained at 973 K for Ca_2.7 Gd_0.15 Y_0.15Co₄O_9+δ.

Original language	English
Pages (from-to)	409-413
Number of pages	5
Journal	Current Applied Physics
Volume	9
Issue number	2
DOIs	https://doi.org/10.1016/j.cap.2008.03.010
State	Published - Mar 2009

Keywords

Impurity compensation effect
Impurity scattering
Polaronic hopping conduction
Polyacrylamide gel method
Thermoelectric properties

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10.1016/j.cap.2008.03.010

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title = "Thermoelectric properties of Gd, Y co-doped Ca3Co4O9+δ",

abstract = "The Ca3-x-yGdxYyCo4O9+δ precursor powders were synthesized by the polyacrylamide gel method. The powders were sintered by the spark plasma sintering (SPS). The DTA analysis showed that the synthesis temperature of Ca3Co4O9+δ was about 933 K, which is lower than that of the conventional citric acid method. The resistivities, the Seebeck coefficients and the thermal conductivities of the samples were measured from room temperature to 973 K. The Seebeck coefficients and the resistivities of the doped samples were remarkably enhanced due to the decrease of the carrier concentration, whereas the thermal conductivities of them were decreased due to the impurity scattering effect. The maximal ZT value of 0.26 was obtained at 973 K for Ca2.7 Gd0.15 Y0.15Co4O9+δ.",

keywords = "Impurity compensation effect, Impurity scattering, Polaronic hopping conduction, Polyacrylamide gel method, Thermoelectric properties",

author = "Liu, \{H. Q.\} and Zhao, \{X. B.\} and Zhu, \{T. J.\} and Y. Song and Wang, \{F. P.\}",

year = "2009",

month = mar,

doi = "10.1016/j.cap.2008.03.010",

language = "英语",

volume = "9",

pages = "409--413",

journal = "Current Applied Physics",

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}

TY - JOUR

T1 - Thermoelectric properties of Gd, Y co-doped Ca3Co4O9+δ

AU - Liu, H. Q.

AU - Zhao, X. B.

AU - Zhu, T. J.

AU - Song, Y.

AU - Wang, F. P.

PY - 2009/3

Y1 - 2009/3

N2 - The Ca3-x-yGdxYyCo4O9+δ precursor powders were synthesized by the polyacrylamide gel method. The powders were sintered by the spark plasma sintering (SPS). The DTA analysis showed that the synthesis temperature of Ca3Co4O9+δ was about 933 K, which is lower than that of the conventional citric acid method. The resistivities, the Seebeck coefficients and the thermal conductivities of the samples were measured from room temperature to 973 K. The Seebeck coefficients and the resistivities of the doped samples were remarkably enhanced due to the decrease of the carrier concentration, whereas the thermal conductivities of them were decreased due to the impurity scattering effect. The maximal ZT value of 0.26 was obtained at 973 K for Ca2.7 Gd0.15 Y0.15Co4O9+δ.

AB - The Ca3-x-yGdxYyCo4O9+δ precursor powders were synthesized by the polyacrylamide gel method. The powders were sintered by the spark plasma sintering (SPS). The DTA analysis showed that the synthesis temperature of Ca3Co4O9+δ was about 933 K, which is lower than that of the conventional citric acid method. The resistivities, the Seebeck coefficients and the thermal conductivities of the samples were measured from room temperature to 973 K. The Seebeck coefficients and the resistivities of the doped samples were remarkably enhanced due to the decrease of the carrier concentration, whereas the thermal conductivities of them were decreased due to the impurity scattering effect. The maximal ZT value of 0.26 was obtained at 973 K for Ca2.7 Gd0.15 Y0.15Co4O9+δ.

KW - Impurity compensation effect

KW - Impurity scattering

KW - Polaronic hopping conduction

KW - Polyacrylamide gel method

KW - Thermoelectric properties

UR - https://www.scopus.com/pages/publications/55049098666

U2 - 10.1016/j.cap.2008.03.010

DO - 10.1016/j.cap.2008.03.010

M3 - 文章

AN - SCOPUS:55049098666

SN - 1567-1739

VL - 9

SP - 409

EP - 413

JO - Current Applied Physics

JF - Current Applied Physics

IS - 2

ER -

Thermoelectric properties of Gd, Y co-doped Ca₃Co₄O_9+δ

Abstract

Keywords

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