Structural and thermoelectric properties of chimney-ladder compounds in the Ru-Mn-Si system

Norihiko L. Okamoto; Tatsuya Koyama; Kyosuke Kishida; Katsushi Tanaka; Haruyuki Inui

doi:10.1007/s11664-010-1260-y

Structural and thermoelectric properties of chimney-ladder compounds in the Ru-Mn-Si system

Norihiko L. Okamoto, Tatsuya Koyama, Kyosuke Kishida, Katsushi Tanaka, Haruyuki Inui

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

We have investigated phase relationships of the sesquisilicide alloys in the Ru-Mn-Si system. A series of chimney-ladder phases Ru _1-x Mn _x Si _y (0.14 ≤ x ≤ 0.97, 1.584 ≤ y ≤ 1.741) are formed over a wide compositional range between Ru ₂Si ₃ and Mn ₄Si ₇. We also investigated thermoelectric properties of the directionally solidified Ru _1-x Mn _x Si _y alloys as a function of Mn content and temperature. The dimensionless figure of merit ZT for alloys with high Mn content (x ≥ 0.75) increases as the Mn content increases. The alloy with x = 0.90 exhibits ZT as high as 0.76 at 874 K.

Original language	English
Pages (from-to)	1640-1644
Number of pages	5
Journal	Journal of Electronic Materials
Volume	39
Issue number	9
DOIs	https://doi.org/10.1007/s11664-010-1260-y
Publication status	Published - 2010 Sep 1
Externally published	Yes

Keywords

Transition-metal silicide
thermal conductivity
transmission electron microscopy (TEM)
valence electron count (VEC)

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering
Materials Chemistry

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10.1007/s11664-010-1260-y

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title = "Structural and thermoelectric properties of chimney-ladder compounds in the Ru-Mn-Si system",

abstract = "We have investigated phase relationships of the sesquisilicide alloys in the Ru-Mn-Si system. A series of chimney-ladder phases Ru 1-x Mn x Si y (0.14 ≤ x ≤ 0.97, 1.584 ≤ y ≤ 1.741) are formed over a wide compositional range between Ru 2Si 3 and Mn 4Si 7. We also investigated thermoelectric properties of the directionally solidified Ru 1-x Mn x Si y alloys as a function of Mn content and temperature. The dimensionless figure of merit ZT for alloys with high Mn content (x ≥ 0.75) increases as the Mn content increases. The alloy with x = 0.90 exhibits ZT as high as 0.76 at 874 K.",

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AU - Okamoto, Norihiko L.

AU - Koyama, Tatsuya

AU - Kishida, Kyosuke

AU - Tanaka, Katsushi

AU - Inui, Haruyuki

PY - 2010/9/1

Y1 - 2010/9/1

N2 - We have investigated phase relationships of the sesquisilicide alloys in the Ru-Mn-Si system. A series of chimney-ladder phases Ru 1-x Mn x Si y (0.14 ≤ x ≤ 0.97, 1.584 ≤ y ≤ 1.741) are formed over a wide compositional range between Ru 2Si 3 and Mn 4Si 7. We also investigated thermoelectric properties of the directionally solidified Ru 1-x Mn x Si y alloys as a function of Mn content and temperature. The dimensionless figure of merit ZT for alloys with high Mn content (x ≥ 0.75) increases as the Mn content increases. The alloy with x = 0.90 exhibits ZT as high as 0.76 at 874 K.

AB - We have investigated phase relationships of the sesquisilicide alloys in the Ru-Mn-Si system. A series of chimney-ladder phases Ru 1-x Mn x Si y (0.14 ≤ x ≤ 0.97, 1.584 ≤ y ≤ 1.741) are formed over a wide compositional range between Ru 2Si 3 and Mn 4Si 7. We also investigated thermoelectric properties of the directionally solidified Ru 1-x Mn x Si y alloys as a function of Mn content and temperature. The dimensionless figure of merit ZT for alloys with high Mn content (x ≥ 0.75) increases as the Mn content increases. The alloy with x = 0.90 exhibits ZT as high as 0.76 at 874 K.

KW - Transition-metal silicide

KW - thermal conductivity

KW - transmission electron microscopy (TEM)

KW - valence electron count (VEC)

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