TY - JOUR
T1 - Thermoelectric transport properties of the van der Waals-type layered rhombohedral SnAs-based compound, EuSn2As2
AU - Sakagami, Ryosuke
AU - Goto, Yosuke
AU - Karimata, Harunari
AU - Azuma, Nobuhiko
AU - Yamaguchi, Michitaro
AU - Iwasaki, Suguru
AU - Nakanishi, Manami
AU - Kitawaki, Itsuki
AU - Mizuguchi, Yoshikazu
AU - Matoba, Masanori
AU - Kamihara, Yoichi
N1 - Publisher Copyright:
© 2021 The Japan Society of Applied Physics.
PY - 2021/3
Y1 - 2021/3
N2 - The thermoelectric transport properties of the van der Waals-type layered rhombohedral SnAs-based compound, EuSn2As2, have been investigated. A densified polycrystalline sample of EuSn2As2 with porosity (φ) of 2.4(9) vol.% exhibited a weak orientation to the c-axis for hexagonal coordination system; the weak orientation is parallel (P ∥) to the pressing direction of hot pressing. Measurements of electrical resistivity (ρ), Seebeck coefficient (S), and thermal conductivity (κ) were conducted perpendicular (P ⊥) to the pressing direction. The experimental values of ρ and S exhibit metallic temperature dependence and p-type carrier polarity. The power factor (P) was 0.51(8) mW m-1 K-2 at 673(4) K. Using the Wiedemann-Franz-Lorenz law, the phonon thermal conductivity (κ ph) was estimated to be 0.4(6) W m-1 K-1 at 673(6) K. The dimensionless figure of merit, ZT, was 0.092(17) at 673(3) K.
AB - The thermoelectric transport properties of the van der Waals-type layered rhombohedral SnAs-based compound, EuSn2As2, have been investigated. A densified polycrystalline sample of EuSn2As2 with porosity (φ) of 2.4(9) vol.% exhibited a weak orientation to the c-axis for hexagonal coordination system; the weak orientation is parallel (P ∥) to the pressing direction of hot pressing. Measurements of electrical resistivity (ρ), Seebeck coefficient (S), and thermal conductivity (κ) were conducted perpendicular (P ⊥) to the pressing direction. The experimental values of ρ and S exhibit metallic temperature dependence and p-type carrier polarity. The power factor (P) was 0.51(8) mW m-1 K-2 at 673(4) K. Using the Wiedemann-Franz-Lorenz law, the phonon thermal conductivity (κ ph) was estimated to be 0.4(6) W m-1 K-1 at 673(6) K. The dimensionless figure of merit, ZT, was 0.092(17) at 673(3) K.
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U2 - 10.35848/1347-4065/abe449
DO - 10.35848/1347-4065/abe449
M3 - Article
AN - SCOPUS:85102426010
VL - 60
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 3
M1 - 035511
ER -