Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 15, Pages 19538-19541Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.06.104
Keywords
Thermoelectricity; Higher manganese silicide; Secondary phase; Solid-state reaction; Arc melting
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Funding
- National Research Foundation of Korea (NRF) Grant [2017R1A2A1A17069528]
- Priority Research Centers Program [2019R1A6A1A11055660]
- National Research Foundation of Korea [2017R1A2A1A17069528] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Controlling the generation of secondary phases in thermoelectric higher manganese silicides is crucial to enhance their thermoelectric performance for use in automotive thermoelectric generators. However, the effect of different synthesis and sintering procedures on the secondary phase formation and thermoelectric properties has not yet been investigated. In this study, we demonstrate that fabricating Mn11Si19 via arc melting and spark plasma sintering results in a figure of merit (ZT) of 0.43 at 823 K, which is 15% higher than for a sample fabricated by a solid-state reaction and spark plasma sintering. We found that the presence of secondary MnSi phases in the Mn(11)Sin(19) samples was significantly reduced when using arc melting instead of solid-state reaction, which suggests that the phase formation behavior could be controlled by optimizing the fabrication process.
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