Thermoelectric transport properties of the van der Waals-type layered rhombohedral SnAs-based compound, EuSn2As2

Ryosuke Sakagami; Yosuke Goto; Harunari Karimata; Nobuhiko Azuma; Michitaro Yamaguchi; Suguru Iwasaki; Manami Nakanishi; Itsuki Kitawaki; Yoshikazu Mizuguchi; Masanori Matoba; Yoichi Kamihara

doi:10.35848/1347-4065/abe449

Thermoelectric transport properties of the van der Waals-type layered rhombohedral SnAs-based compound, EuSn₂As₂

Ryosuke Sakagami, Yosuke Goto, Harunari Karimata, Nobuhiko Azuma, Michitaro Yamaguchi, Suguru Iwasaki, Manami Nakanishi, Itsuki Kitawaki, Yoshikazu Mizuguchi, Masanori Matoba, Yoichi Kamihara

物理情報工学科

研究成果: Article › 査読

2 被引用数 (Scopus)

抄録

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.

本文言語	English
論文番号	035511
ジャーナル	Japanese journal of applied physics
巻	60
号	3
DOI	https://doi.org/10.35848/1347-4065/abe449
出版ステータス	Published - 2021 3月

ASJC Scopus subject areas

工学（全般）
物理学および天文学（全般）

文献へのアクセス

10.35848/1347-4065/abe449

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引用スタイル

Thermoelectric transport properties of the van der Waals-type layered rhombohedral SnAs-based compound, EuSn₂As₂. / Sakagami, Ryosuke; Goto, Yosuke; Karimata, Harunari; Azuma, Nobuhiko; Yamaguchi, Michitaro; Iwasaki, Suguru; Nakanishi, Manami; Kitawaki, Itsuki; Mizuguchi, Yoshikazu; Matoba, Masanori ; Kamihara, Yoichi.

In: Japanese journal of applied physics, Vol. 60, No. 3, 035511, 03.2021.

研究成果: Article › 査読

Sakagami, Ryosuke ; Goto, Yosuke ; Karimata, Harunari ; Azuma, Nobuhiko ; Yamaguchi, Michitaro ; Iwasaki, Suguru ; Nakanishi, Manami ; Kitawaki, Itsuki ; Mizuguchi, Yoshikazu ; Matoba, Masanori ; Kamihara, Yoichi. / Thermoelectric transport properties of the van der Waals-type layered rhombohedral SnAs-based compound, EuSn₂As₂. In: Japanese journal of applied physics. 2021 ; Vol. 60, No. 3.

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abstract = "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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