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  Miscibility Gap in the Phase Diagrams of Thermoelectric Half-Heusler Materials CoTi1-xYxSb (Y = Sc, V, Mn, Fe)

Mena, J. M., Rausch, E., Ouardi, S., Gruhn, T., Fecher, G. H., Schoberth, H. G., et al. (2016). Miscibility Gap in the Phase Diagrams of Thermoelectric Half-Heusler Materials CoTi1-xYxSb (Y = Sc, V, Mn, Fe). Journal of Electronic Materials, 45(3), 1382-1388. doi:10.1007/s11664-015-4041-9.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-2DE5-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-08E9-0
Genre: Journal Article

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 Creators:
Mena, Joaquin Miranda1, Author
Rausch, Elisabeth2, Author              
Ouardi, Siham3, Author              
Gruhn, Thomas1, Author
Fecher, Gerhard H.4, Author              
Schoberth, Heiko G.1, Author
Emmerich, Heike1, Author
Felser, Claudia5, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Siham Ouardi, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863439              
4Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863431              
5Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: The half-Heusler system CoTi1-xYxSb (Y = Sc, V, Mn, Fe) has been investigated by means of an ab initio-based mean-field model which provides phase diagrams of alloys. Co(Ti, Y) Sb materials show a miscibility gap, which leads to spontaneous demixing within a spinodal region. The results are compared with experimental investigations of microstructure and transport properties of the alloys. The thermoelectric properties of the solid solution were investigated comprehensively by measuring the temperature dependence of the Seebeck coefficient as well as electrical and thermal conductivity. Compared with pure CoTiSb, the thermal conductivity of substituted CoTi0.9Y0.1Sb was significantly reduced by approximately 53% for Y = V. Here, we report on the effect of phase separation in the Co(Ti, Y) Sb system and its consequences for the thermoelectric figure or merit.

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 Dates: 2016-03-212016-03-21
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: ISI: 000371163400027
DOI: 10.1007/s11664-015-4041-9
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Title: Journal of Electronic Materials
  Other : J. Electron. Mater.
Source Genre: Journal
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Publ. Info: Warrendale, PA, etc. : Minerals, Metals & Materials Society and IEEE [etc.]
Pages: - Volume / Issue: 45 (3) Sequence Number: - Start / End Page: 1382 - 1388 Identifier: ISSN: 0361-5235
CoNE: https://pure.mpg.de/cone/journals/resource/954925521690