TY - JOUR
T1 - Structural and thermoelectric properties of chimney-ladder compounds in the Ru-Mn-Si system
AU - Okamoto, Norihiko L.
AU - Koyama, Tatsuya
AU - Kishida, Kyosuke
AU - Tanaka, Katsushi
AU - Inui, Haruyuki
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research (A) (No. 21246101) and Young Scientists (Start-up) (No. 20960049) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan, and in part by the Global COE (Center of Excellence) Program of International Center for Integrated Research and Advanced Education in Materials Science from the MEXT, Japan. One of the authors (N.L.O.) expresses his appreciation to Yoshida Foundation for Science and Technology. The authors would like to thank Mr. Koyanagi, Osaka Titanium Technologies Co. Ltd., for supplying titanium sponge as oxygen getter.
PY - 2010/9
Y1 - 2010/9
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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U2 - 10.1007/s11664-010-1260-y
DO - 10.1007/s11664-010-1260-y
M3 - Article
AN - SCOPUS:77956228545
VL - 39
SP - 1640
EP - 1644
JO - Journal of Electronic Materials
JF - Journal of Electronic Materials
SN - 0361-5235
IS - 9
ER -