NDLI: Residual conductivity and Seebeck coefficient calculations in TiCo1-xCuxSb alloys

Content Provider	IEEE Xplore Digital Library
Author	Stopa, T. Tobola, J. Kaprzyk, S.
Copyright Year	2006
Description	Author affiliation: Fac. of Phys. & Appl. Comput. Sci., AGH Univ. of Sci. & Technol., Krakow (Stopa, T.; Tobola, J.; Kaprzyk, S.)
Abstract	We report results of conductivity and Seebeck coefficient calculations for $TiCo_{1-x}Cu_{x}Sb$ alloys, as well as their comparison with experimental data. TiCoSb crystallizes in a half-Heusler crystal structure. As revealed from experimental measurements by Horyn et al., this type of structure does not change with Cu doping until x = 0.5. Moreover, lattice constant changes also very slightly and not-monotonically for 0 < x < 0.5, varying less then 0.001 nm. Therefore, we decided to use fixed lattice constant a = 0.58819 nm for all Cu concentrations. In $TiCo_{1-x}Cu_{x}Sb$ a semiconductor-metal phase transition is observed upon even very small Cu doping. This is connected with the fact, that Fermi level in TiCoSb is located at the top of valence band. When the number of electrons in the system grows, Fermi energy crosses energy gap (which is about 1 eV) and enters conduction band. Also Seebeck coefficient increases rapidly with x from about -350 muV/K in TiCoSb to almost zero for x = 0.5, but it doesn't change the sign. All calculations were performed within Korringa-Kohn-Rostoker (KKR) method [Bansil et al., 1990 and 1999] with coherent potential approximation (CPA) [Soven, 1967] and [Kaprzyk and Bansil, 1990]
Starting Page	132
Ending Page	135
File Size	3692464
Page Count	4
File Format	PDF
ISBN	1424408105
ISSN	10942734
DOI	10.1109/ICT.2006.331298
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-08-06
Publisher Place	Austria
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Conductivity Electrons Crystallization Semiconductor device doping Lattices High performance computing Physics Computer science Dispersion Linear discriminant analysis
Content Type	Text
Resource Type	Article

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