NDLI: Electronic and thermoelectric properties of Yb/sub y/Fe/sub 4-x/Ni/sub x/Sb/sub 12/ filled skutterudites

Content Provider	IEEE Xplore Digital Library
Author	Anno, H. Nagao, J. Matsubara, K.
Copyright Year	2002
Description	Author affiliation: Tokyo Univ. of Sci., Yamaguchi, Japan (Anno, H.)
Abstract	Polycrystalline p-type Yb/sub y/Fe/sub 4-x/Ni/sub x/Sb/sub 12/ (nominal x=0-0.8, y=1) filled skutterudite compounds have been grown by a spark plasma sintering technique and their electronic and thermoelectric properties have been investigated. The electronic structure of p-type Yb/sub y/Fe/sub 4-x/Ni/sub x/Sb/sub 12/ compounds has been studied by x-ray photoelectron spectroscopy. In these materials, valence-band and core-level photoelectron spectra clearly indicate the intermediate valence (mixed valence) states of Yb between divalent and trivalent. Further the valence-band spectra show that the Yb 4f states are hybridized with the Fe (Ni) 3d and Sb 5p states. The lattice thermal conductivity for these compounds is extremely low (/spl sim/0.01 W/cmK). The Seebeck coefficient increases with increasing carrier concentration in contrast to a behavior of ordinary semiconductors. This behavior can be attributed to an enhancement of density of states effective mass due to the narrow 4f band effects. The dimensionless thermoelectric figure of merit ZT/spl sim/1 (750-850 K) was estimated for p-type Yb/sub y/Fe/sub 4-x/Ni/sub x/Sb/sub 12/ samples with x=0.6 and 0.8.
Starting Page	56
Ending Page	59
File Size	290622
Page Count	4
File Format	PDF
ISBN	0780376838
DOI	10.1109/ICT.2002.1190264
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-08-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Thermoelectricity Iron Plasma properties Thermal conductivity Sparks Plasma x-ray sources Spectroscopy Conducting materials Lattices Effective mass
Content Type	Text
Resource Type	Article

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