Observed properties and electronic structure of RNiSb compounds (R = Ho, Er, Tm, Yb and Y). Potential thermoelectric materials

S. Sportouch, P. Larson, M. Bastea, P. Brazis, J. Ireland, C. R. Kannewurf, S. D. Mahanti, C. Uher, Mercouri G Kanatzidis

Research output: Chapter in Book/Report/Conference proceedingChapter

25 Citations (Scopus)

Abstract

The RNiSb compounds (R=Ho, Er, Tm, Yb and Y) and some selected solid solution members such as (Zr1-xErx)Ni(Sn1-xSbx) and ErNiSb1-xPnx (Pn=As, Sb, Bi) have been studied. They all crystallize in the MgAgAs structure type, which can be considered as a NaCl structure type in which half of the interstitial tetrahedral sites are occupied by Ni atoms. The measured values of the Seebeck coefficients, at room temperature, are positive for RNiSb (R=Ho, Er, Yb and Y) compounds and ErNiSb1-xPnx (Pn=As, Sb, Bi) solid solutions, but for (Zr1-xErx)Ni(Sn1-xSbx) members vary from negative to positive values when 0 <x <1. Some of these compounds show metallic conductivity while others exhibit thermally activated charge transport. Solid solutions of these materials have lower thermal conductivities than the pure members, RNiSb (R=Ho, Er, Yb and Y) and ZrNiSn. The electronic structures of RNiSb compounds, where R is Y, La, Lu, and Yb, have been studied with density functional theory. The results of the calculations for these systems, except for the Yb compound, indicate narrow gap semiconductors with large effective masses near the conduction band extrema. The Yb system is expected to show heavy fermion characteristics.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium - Proceedings
PublisherMaterials Research Society
Pages421-433
Number of pages13
Volume545
Publication statusPublished - 1999
EventProceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998' - Boston, MA, USA
Duration: Nov 30 1998Dec 3 1998

Other

OtherProceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998'
CityBoston, MA, USA
Period11/30/9812/3/98

Fingerprint

Electronic structure
Solid solutions
Metallic compounds
Seebeck coefficient
Fermions
Conduction bands
Density functional theory
Charge transfer
Thermal conductivity
Semiconductor materials
Atoms
Temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Sportouch, S., Larson, P., Bastea, M., Brazis, P., Ireland, J., Kannewurf, C. R., ... Kanatzidis, M. G. (1999). Observed properties and electronic structure of RNiSb compounds (R = Ho, Er, Tm, Yb and Y). Potential thermoelectric materials. In Materials Research Society Symposium - Proceedings (Vol. 545, pp. 421-433). Materials Research Society.

Observed properties and electronic structure of RNiSb compounds (R = Ho, Er, Tm, Yb and Y). Potential thermoelectric materials. / Sportouch, S.; Larson, P.; Bastea, M.; Brazis, P.; Ireland, J.; Kannewurf, C. R.; Mahanti, S. D.; Uher, C.; Kanatzidis, Mercouri G.

Materials Research Society Symposium - Proceedings. Vol. 545 Materials Research Society, 1999. p. 421-433.

Research output: Chapter in Book/Report/Conference proceedingChapter

Sportouch, S, Larson, P, Bastea, M, Brazis, P, Ireland, J, Kannewurf, CR, Mahanti, SD, Uher, C & Kanatzidis, MG 1999, Observed properties and electronic structure of RNiSb compounds (R = Ho, Er, Tm, Yb and Y). Potential thermoelectric materials. in Materials Research Society Symposium - Proceedings. vol. 545, Materials Research Society, pp. 421-433, Proceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998', Boston, MA, USA, 11/30/98.
Sportouch S, Larson P, Bastea M, Brazis P, Ireland J, Kannewurf CR et al. Observed properties and electronic structure of RNiSb compounds (R = Ho, Er, Tm, Yb and Y). Potential thermoelectric materials. In Materials Research Society Symposium - Proceedings. Vol. 545. Materials Research Society. 1999. p. 421-433
Sportouch, S. ; Larson, P. ; Bastea, M. ; Brazis, P. ; Ireland, J. ; Kannewurf, C. R. ; Mahanti, S. D. ; Uher, C. ; Kanatzidis, Mercouri G. / Observed properties and electronic structure of RNiSb compounds (R = Ho, Er, Tm, Yb and Y). Potential thermoelectric materials. Materials Research Society Symposium - Proceedings. Vol. 545 Materials Research Society, 1999. pp. 421-433
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