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Thermoelectric Properties of Bulk Yttrium Silicide (YSi2) Fabricated by Arc Melting and Spark Plasma Sintering
Author(s) -
Wongprakarn Suphagrid,
Pinitsoontorn Supree,
Tanusilp Soraat,
Kurosaki Ken
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700769
Subject(s) - spark plasma sintering , materials science , thermoelectric effect , ingot , thermoelectric materials , thermal conductivity , electrical resistivity and conductivity , yttrium , atmospheric temperature range , thermoelectric generator , metallurgy , seebeck coefficient , sintering , analytical chemistry (journal) , composite material , alloy , thermodynamics , oxide , physics , electrical engineering , engineering , chemistry , chromatography
Yttrium silicide (YSi 2 ) nanoparticles in SiGe are reported to enhance the thermoelectric figure‐of‐merit ( ZT ) to the recorded value (≈1.81). However, the thermoelectric properties of bulk YSi 2 has never been reported. In this work, the thermoelectric properties of YSi 2 is studied for the first time. The bulk YSi 2 is fabricated by arc melting highly pure Si and Y raw materials. The ingot is crushed to powder and compacted to form a highly dense pellet by spark plasma sintering. By optimizing the processing parameters, the single phase with the AlB 2 ‐type structure ( P 6/ mmm ) is formed. The Hall measurements show that YSi 2 exhibit a metallic‐like behavior with a very high electron concentration. This result in the thermoelectric properties with a very large electrical conductivity (≈18 × 10 5 Ω −1 m −1 ) but a small Seebeck coefficient (−26 µV K −1 ) at room temperature, and decrease with temperature. The thermal conductivity is around 14–19 W m −1 K −1 for all temperature range. The maximum ZT value is 0.026 at 423 K.