Thermoelectric performance of Mg2-xCaxSi compounds

Q. Zhang; X. B. Zhao; H. Yin; T. J. Zhu

doi:10.1016/j.jallcom.2007.09.101

Thermoelectric performance of Mg_2-xCa_xSi compounds

Q. Zhang
, X. B. Zhao^*
, H. Yin
, T. J. Zhu

^*Corresponding author for this work

Zhejiang University

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

58 Scopus citations

Abstract

Thermoelectric materials Mg_2-xCa_xSi (x = 0, 0.01, 0.03, 0.05, 0.07, 0.1) compounds have been prepared by vacuum melting followed by hot-pressing. Effects of the substitution of Ca for Mg on phase structures and the thermoelectric properties of the hot-pressed compounds were investigated. It was found that the alloying of Ca in Mg₂Si based compounds increases the electrical conductivity and decreases the Seebeck coefficient of the compounds, due to the electronegativity difference between Ca and Mg. The dimensionless figures of merit of Mg₂Si and Mg_1.99Ca_0.01Si reach, respectively, 0.41 and 0.34 at 660 K.

Original language	English
Pages (from-to)	9-12
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	464
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2007.09.101
State	Published - 22 Sep 2008
Externally published	Yes

Keywords

Intermetallics
Thermoelectric materials
Thermoelectrics

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10.1016/j.jallcom.2007.09.101

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title = "Thermoelectric performance of Mg2-xCaxSi compounds",

abstract = "Thermoelectric materials Mg2-xCaxSi (x = 0, 0.01, 0.03, 0.05, 0.07, 0.1) compounds have been prepared by vacuum melting followed by hot-pressing. Effects of the substitution of Ca for Mg on phase structures and the thermoelectric properties of the hot-pressed compounds were investigated. It was found that the alloying of Ca in Mg2Si based compounds increases the electrical conductivity and decreases the Seebeck coefficient of the compounds, due to the electronegativity difference between Ca and Mg. The dimensionless figures of merit of Mg2Si and Mg1.99Ca0.01Si reach, respectively, 0.41 and 0.34 at 660 K.",

keywords = "Intermetallics, Thermoelectric materials, Thermoelectrics",

author = "Q. Zhang and Zhao, \{X. B.\} and H. Yin and Zhu, \{T. J.\}",

year = "2008",

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doi = "10.1016/j.jallcom.2007.09.101",

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TY - JOUR

T1 - Thermoelectric performance of Mg2-xCaxSi compounds

AU - Zhang, Q.

AU - Zhao, X. B.

AU - Yin, H.

AU - Zhu, T. J.

PY - 2008/9/22

Y1 - 2008/9/22

N2 - Thermoelectric materials Mg2-xCaxSi (x = 0, 0.01, 0.03, 0.05, 0.07, 0.1) compounds have been prepared by vacuum melting followed by hot-pressing. Effects of the substitution of Ca for Mg on phase structures and the thermoelectric properties of the hot-pressed compounds were investigated. It was found that the alloying of Ca in Mg2Si based compounds increases the electrical conductivity and decreases the Seebeck coefficient of the compounds, due to the electronegativity difference between Ca and Mg. The dimensionless figures of merit of Mg2Si and Mg1.99Ca0.01Si reach, respectively, 0.41 and 0.34 at 660 K.

AB - Thermoelectric materials Mg2-xCaxSi (x = 0, 0.01, 0.03, 0.05, 0.07, 0.1) compounds have been prepared by vacuum melting followed by hot-pressing. Effects of the substitution of Ca for Mg on phase structures and the thermoelectric properties of the hot-pressed compounds were investigated. It was found that the alloying of Ca in Mg2Si based compounds increases the electrical conductivity and decreases the Seebeck coefficient of the compounds, due to the electronegativity difference between Ca and Mg. The dimensionless figures of merit of Mg2Si and Mg1.99Ca0.01Si reach, respectively, 0.41 and 0.34 at 660 K.

KW - Intermetallics

KW - Thermoelectric materials

KW - Thermoelectrics

UR - https://www.scopus.com/pages/publications/49749128017

U2 - 10.1016/j.jallcom.2007.09.101

DO - 10.1016/j.jallcom.2007.09.101

M3 - 文章

AN - SCOPUS:49749128017

SN - 0925-8388

VL - 464

SP - 9

EP - 12

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

ER -

Thermoelectric performance of Mg_2-xCa_xSi compounds

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Keywords

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