Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 464, Issue 1-2, Pages 9-12Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2007.09.101
Keywords
thermoelectric materials; intermetallics; thermoelectrics
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Funding
- National Natural Science Foundation of China [50522103]
- National Basic Research Program of China [2007CB607502]
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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 Mg1.99Ca0.01 Si reach, respectively, 0.41 and 0.34 at 660 K. (C) 2007 Elsevier B.V. All rights reserved.
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