Miscibility Gap in the Phase Diagrams of Thermoelectric Half-Heusler Materials CoTi_(1-x)Y_(x)Sb (Y = Sc, V, Mn, Fe)

Title data

Miranda Mena, Joaquin ; Rausch, Elisabeth ; Ouardi, Siham ; Gruhn, Thomas ; Fecher, Gerhard H. ; Schoberth, Heiko G. ; Emmerich, Heike ; Felser, Claudia:
Miscibility Gap in the Phase Diagrams of Thermoelectric Half-Heusler Materials CoTi_(1-x)Y_(x)Sb (Y = Sc, V, Mn, Fe).
In: Journal of Electronic Materials. Vol. 45 (2016) Issue 3 . - pp. 1382-1388.
ISSN 1543-186X
DOI: https://doi.org/10.1007/s11664-015-4041-9

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Abstract in another language

The half-Heusler system CoTi $${_{1-x}Y_x}$$ 1 - x Y x Sb (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 CoTi $${_{0.9}Y_{0.1}}$$ 0.9 Y 0.1 Sb 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.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Institutions of the University:	Faculties > Faculty of Engineering Science > Chair Material and Process Simulations Faculties > Faculty of Engineering Science > Former Professors > Chair Material and Process Simulations - Univ.-Prof. Dr.-Ing. Heike Emmerich Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Former Professors
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 530 Physics 500 Science > 540 Chemistry 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited:	14 Mar 2016 10:53
Last Modified:	08 May 2020 09:43
URI:	https://eref.uni-bayreuth.de/id/eprint/31728