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タイトル: | Crystal structure and thermoelectric properties of chimney–ladder compounds in the Ru2Si3–Mn4Si7 pseudobinary system |
著者: | Okamoto, Norihiko L. Koyama, Tatsuya Kishida, Kyosuke https://orcid.org/0000-0003-0391-5022 (unconfirmed) Tanaka, Katsushi Inui, Haruyuki https://orcid.org/0000-0003-0835-6725 (unconfirmed) |
著者名の別形: | 岡本, 範彦 |
キーワード: | Transition metal silicide Transmission electron microscopy X-ray diffraction Directional solidification Thermal conductivity |
発行日: | Oct-2009 |
出版者: | Elsevier |
引用: | Norihiko L. Okamoto and Tatsuya Koyama and Kyosuke Kishida and Katsushi Tanaka and Haruyuki Inui. Crystal structure and thermoelectric properties of chimney–ladder compounds in the Ru2Si3–Mn4Si7 pseudobinary system. Acta Materialia. 2009, 57(17), 5036-5045. |
誌名: | Acta Materialia |
巻: | 57 |
号: | 17 |
開始ページ: | 5036 |
終了ページ: | 5045 |
抄録: | 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 less-than-or-equals, slant x less-than-or-equals, slant 0.97, 1.584 less-than-or-equals, slant y less-than-or-equals, slant 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 less-than-or-equals, slant x less-than-or-equals, slant 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 greater-or-equal, slanted 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. |
著作権等: | Copyright © 2009 Elsevier This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/123373 |
DOI(出版社版): | 10.1016/j.actamat.2009.07.005 |
出現コレクション: | 学術雑誌掲載論文等 |
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