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Thermoelectric properties of single-phase full-Heusler alloy Fe2TiSi films with D03-type disordering
Fe 2TiSi has been expected to be one of the high-performance thermoelectric full-Heusler alloys. Here, we experimentally clarify the room-temperature Seebeck coefficient ( S) and thermal conductivity ( κ) for the Fe 2TiSi films. Using a molecular beam epitaxy technique, we demonstrate the high degre...
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Published in: | Journal of applied physics 2020-02, Vol.127 (5) |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | Fe
2TiSi has been expected to be one of the high-performance thermoelectric full-Heusler alloys. Here, we experimentally clarify the room-temperature Seebeck coefficient (
S) and thermal conductivity (
κ) for the Fe
2TiSi films. Using a molecular beam epitaxy technique, we demonstrate the high degree of
L
2
1-ordering and the homogeneous single-phase structure in the Fe
2TiSi films. We find that the intrinsic conduction carriers of the Fe
2TiSi films are holes and impurity-induced carrier scattering is indicated, derived from weak magnetic moments due to the presence of
D
0
3-type (Fe
⇔ Ti) structural disorder in the Fe
2TiSi film. From reliable measurements for thin films, the values of
S and
κ are estimated to be 101
μV/K and 5.6 W/(m K), respectively, at room temperature. This study will open a new way for full-Heusler alloy thermoelectric materials other than those in Fe
2VAl systems. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.5141949 |