Journal
ACTA MATERIALIA
Volume 57, Issue 17, Pages 5036-5045Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.07.005
Keywords
Transition metal silicide; Transmission electron microscopy; X-ray diffraction; Directional solidification; Thermal conductivity
Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [21246101, 20960049]
- Grants-in-Aid for Scientific Research [21246101] Funding Source: KAKEN
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Phase relationships of manganese-substituted ruthenium sesquisilicide alloys have been investigated by using X-ray powder diffraction and scanning and transmission electron microscopy. A series of chimney-ladder phases Ru1-xMnxSiy (0.14 <= x <= 0.97, 1.584 <= y <= 1.741) are formed over a wide compositional range between Ru2Si3 and Mn4Si7. The compositions of these chimney-ladder compounds deviate slightly from the composition line connecting Ru2Si3 and Mn4Si7, which corresponds to the ideal composition line satisfying VEC (valence electron counting) = 14 rule. The occurrence of this compositional deviation is discussed in terms of the VEC rule and the atomic packing. The thermoelectric properties of the directionally solidified Ru1-xMnxSiy alloys (0.55 <= x <= 0.90) have also been investigated as a function of the Mn content and temperature. The dimensionless figure of merit (ZT) for those alloys with a high Mn content (x <= 0.75) increased with the increase in Mn content. The ZT value for a crystal with x = 0.90 was as high as 0.76 at 874 K. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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