Thermoelectric properties of (Yb, Ca)x(Co, Fe) 4Sb12 skutterudites

J. Q. Guo; H. Y. Geng; S. Ochi; H. K. Kim; H. Hyodo; K. Kimura

doi:10.1109/ICT.2007.4569453

Thermoelectric properties of (Yb, Ca)_x(Co, Fe) ₄Sb₁₂ skutterudites

J. Q. Guo
, H. Y. Geng
, S. Ochi
, H. K. Kim
, H. Hyodo
, K. Kimura

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

2 Scopus citations

Abstract

For n-type Yb_xCo₄Sb₁₂ skutterudites, Co and Yb were partially substituted by Fe and Ca, respectively, in order to improve its thermoelectric property. When the Yb content of Yb _xCo_4-yFe_ySb₁₂ is in the range of 0.3 ≤ x≤ 0.5 and the Fe content is 0.25 ≤ y ≤ 0.5, the absolute value of Seebeck coefficient increases with the increase of Fe content, while it decreases with the increase of Yb content. The substitution of Fe for Co makes thermal conductivity decreased, for example, from 4.4W/mK of Yb _0.15Co₄Sb₁₂ to 2.4W/mK of Yb _0.4Co_3.625Fe_0.375Sb₁₂ at 723K, which is larger than the increase of electrical resistivity, resulting in improvement of dimensionless figure of merit ZT from 0.7 to 0.9 at 723K. Further addition of Ca to the Yb_xCo_4-yFe_ySb₁₂ skutterudite makes its electrical resistivity and thermal conductivity much decreased so that its ZT is improved up to ZT=1.1 in Yb_0.3Ca _0.1Co_0.75Fe_0.25Sb₁₂. Effect of Yb and Fe contents on ZT value is discussed.

Original language	English
Title of host publication	Proceedings ICT'07 - 26th International Conference on Thermoelectrics
Pages	183-186
Number of pages	4
DOIs	https://doi.org/10.1109/ICT.2007.4569453
State	Published - 2007
Externally published	Yes
Event	ICT'07 - 26th International Conference on Thermoelectrics - Jeju, Korea, Republic of Duration: 3 Jun 2007 → 7 Jun 2007

Publication series

Name	International Conference on Thermoelectrics, ICT, Proceedings

Conference

Conference	ICT'07 - 26th International Conference on Thermoelectrics
Country/Territory	Korea, Republic of
City	Jeju
Period	3/06/07 → 7/06/07

Access to Document

10.1109/ICT.2007.4569453

Cite this

@inproceedings{ec2c40dc2ede435c83934cdcd0934be3,

title = "Thermoelectric properties of (Yb, Ca)x(Co, Fe) 4Sb12 skutterudites",

abstract = "For n-type YbxCo4Sb12 skutterudites, Co and Yb were partially substituted by Fe and Ca, respectively, in order to improve its thermoelectric property. When the Yb content of Yb xCo4-yFeySb12 is in the range of 0.3 ≤ x≤ 0.5 and the Fe content is 0.25 ≤ y ≤ 0.5, the absolute value of Seebeck coefficient increases with the increase of Fe content, while it decreases with the increase of Yb content. The substitution of Fe for Co makes thermal conductivity decreased, for example, from 4.4W/mK of Yb 0.15Co4Sb12 to 2.4W/mK of Yb 0.4Co3.625Fe0.375Sb12 at 723K, which is larger than the increase of electrical resistivity, resulting in improvement of dimensionless figure of merit ZT from 0.7 to 0.9 at 723K. Further addition of Ca to the YbxCo4-yFeySb12 skutterudite makes its electrical resistivity and thermal conductivity much decreased so that its ZT is improved up to ZT=1.1 in Yb0.3Ca 0.1Co0.75Fe0.25Sb12. Effect of Yb and Fe contents on ZT value is discussed.",

author = "Guo, \{J. Q.\} and Geng, \{H. Y.\} and S. Ochi and Kim, \{H. K.\} and H. Hyodo and K. Kimura",

year = "2007",

doi = "10.1109/ICT.2007.4569453",

language = "英语",

isbn = "9781424422623",

series = "International Conference on Thermoelectrics, ICT, Proceedings",

pages = "183--186",

booktitle = "Proceedings ICT'07 - 26th International Conference on Thermoelectrics",

note = "ICT'07 - 26th International Conference on Thermoelectrics ; Conference date: 03-06-2007 Through 07-06-2007",

}

Guo, JQ, Geng, HY, Ochi, S, Kim, HK, Hyodo, H & Kimura, K 2007, Thermoelectric properties of (Yb, Ca)_x(Co, Fe) ₄Sb₁₂ skutterudites. in Proceedings ICT'07 - 26th International Conference on Thermoelectrics., 4569453, International Conference on Thermoelectrics, ICT, Proceedings, pp. 183-186, ICT'07 - 26th International Conference on Thermoelectrics, Jeju, Korea, Republic of, 3/06/07. https://doi.org/10.1109/ICT.2007.4569453

Thermoelectric properties of (Yb, Ca)_x(Co, Fe) ₄Sb₁₂ skutterudites. / Guo, J. Q.; Geng, H. Y.; Ochi, S. et al.
Proceedings ICT'07 - 26th International Conference on Thermoelectrics. 2007. p. 183-186 4569453 (International Conference on Thermoelectrics, ICT, Proceedings).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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T1 - Thermoelectric properties of (Yb, Ca)x(Co, Fe) 4Sb12 skutterudites

AU - Guo, J. Q.

AU - Geng, H. Y.

AU - Ochi, S.

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AU - Hyodo, H.

AU - Kimura, K.

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N2 - For n-type YbxCo4Sb12 skutterudites, Co and Yb were partially substituted by Fe and Ca, respectively, in order to improve its thermoelectric property. When the Yb content of Yb xCo4-yFeySb12 is in the range of 0.3 ≤ x≤ 0.5 and the Fe content is 0.25 ≤ y ≤ 0.5, the absolute value of Seebeck coefficient increases with the increase of Fe content, while it decreases with the increase of Yb content. The substitution of Fe for Co makes thermal conductivity decreased, for example, from 4.4W/mK of Yb 0.15Co4Sb12 to 2.4W/mK of Yb 0.4Co3.625Fe0.375Sb12 at 723K, which is larger than the increase of electrical resistivity, resulting in improvement of dimensionless figure of merit ZT from 0.7 to 0.9 at 723K. Further addition of Ca to the YbxCo4-yFeySb12 skutterudite makes its electrical resistivity and thermal conductivity much decreased so that its ZT is improved up to ZT=1.1 in Yb0.3Ca 0.1Co0.75Fe0.25Sb12. Effect of Yb and Fe contents on ZT value is discussed.

AB - For n-type YbxCo4Sb12 skutterudites, Co and Yb were partially substituted by Fe and Ca, respectively, in order to improve its thermoelectric property. When the Yb content of Yb xCo4-yFeySb12 is in the range of 0.3 ≤ x≤ 0.5 and the Fe content is 0.25 ≤ y ≤ 0.5, the absolute value of Seebeck coefficient increases with the increase of Fe content, while it decreases with the increase of Yb content. The substitution of Fe for Co makes thermal conductivity decreased, for example, from 4.4W/mK of Yb 0.15Co4Sb12 to 2.4W/mK of Yb 0.4Co3.625Fe0.375Sb12 at 723K, which is larger than the increase of electrical resistivity, resulting in improvement of dimensionless figure of merit ZT from 0.7 to 0.9 at 723K. Further addition of Ca to the YbxCo4-yFeySb12 skutterudite makes its electrical resistivity and thermal conductivity much decreased so that its ZT is improved up to ZT=1.1 in Yb0.3Ca 0.1Co0.75Fe0.25Sb12. Effect of Yb and Fe contents on ZT value is discussed.

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SN - 9781424422623

T3 - International Conference on Thermoelectrics, ICT, Proceedings

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BT - Proceedings ICT'07 - 26th International Conference on Thermoelectrics

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