Thermoelectric Performance of Ca2Si Synthesized by High-Temperature Melting

Ca2Si was successfully synthesized via a high-temperature melting furnace and a spark plasma sintering process, allowing its thermoelectric properties to be studied. High-temperature melting furnaces were utilized to inhibit the volatilization of Ca elements during the preparation stage, ensuring th...

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Bibliographic Details
Published inCoatings (Basel) Vol. 13; no. 8; p. 1426
Main Authors Tan, Wenjie, Zhang, Jiarui, Ma, Fukun, Jing, Min, Xing, Ningning
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2023
Subjects
Electrical properties
Figure of merit
Heat conductivity
High temperature
Magnesium compounds
Melting furnaces
Metal silicides
Plasma sintering
Raw materials
Seebeck effect
Semiconductors
Spark plasma sintering
Synthesis
Temperature
Thermal conductivity
Thermoelectricity
United States > US
Germany
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Summary:Ca2Si was successfully synthesized via a high-temperature melting furnace and a spark plasma sintering process, allowing its thermoelectric properties to be studied. High-temperature melting furnaces were utilized to inhibit the volatilization of Ca elements during the preparation stage, ensuring the production of high-purity Ca2Si. The resistivity of Ca2Si increased gradually with rising temperature and reached 12 mΩ·cm at 873 K, demonstrating semi-metallic characteristics. In the temperature range of 323 K–873 K, Ca2Si displayed relatively low total thermal conductivity, from 1.1 to 1.7 W·m−1·K−1. Nevertheless, Ca2Si attained a maximum thermoelectric figure of merit (ZT) of 0.1 due to the atypical behavior and electrical properties of semiconductors. In contrast, Mg2Si achieved a ZT value of 0.32 at 873 K, owing to its exceptional Seebeck coefficient.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings13081426