Electronic, transport, and magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Ca</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Co</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Sb</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:mrow></mml:math>partially filled skutterudites

Puyet, M.; Lenoir, Bertrand; Dauscher, A.; Pécheur, P.; Bellouard, C.; Toboła, J.; Hejtmánek, J.

doi:10.1103/physrevb.73.035126

Cited by 55 publications

(50 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such a dependence of the resistivity on the microstructure has also been observed 27 in polycrystalline CoSb 3 , with reported resistivities of undoped samples between 7 and 1000 μ m at room temperature. [27][28][29][30][31][32][33] The 300 K resistivity of 29.4(1) μ m observed for crack-free FeSb 3 is similar to the 37 μ m of a polycrystalline, sintered, CoSb 3 sample, 30 which also exhibits the temperature dependence of a typical semiconductor.…”

Section: A Electric Transport and Magnetismsupporting

confidence: 52%

Lattice dynamics in the FeSb3skutterudite

et al. 2011

View full text Add to dashboard Cite

Section: A Electric Transport and Magnetismsupporting

confidence: 52%

Lattice dynamics in the FeSb3skutterudite

et al. 2011

View full text Add to dashboard Cite

“…The efficiency of advanced thermoelectric technology is governed by the materialÕs dimensionless thermoelectric figure of merit ZT = S 2 rT/j, which is defined by the following transport parameters: the absolute temperature T, thermopower S, electrical conductivity r, and thermal conductivity j. Skutterudites have been attracting substantial interest because of their high ZT values in both n-type and p-type materials. 1 Filling the voids in skutterudites with foreign ions such as rare earths, 2-9 alkalines, 10 or alkaline earths [11][12][13] (thus forming filled skutterudites) has been shown to be effective in reducing lattice thermal conductivity (j L ), and enhancing ZT. [2][3][4][5][6][7][8][9][10][11][12][13][14][15] The weakly bound filler ions with their independent, Einstein-like vibration modes interact with the normal modes of the structure and dramatically suppress j L .…”

Section: Introductionmentioning

confidence: 98%

Thermoelectric Properties of n-Type Multiple-Filled Skutterudites

Shi

Salvador

Yang

et al. 2009

Journal of Elec Materi

View full text Add to dashboard Cite

Filled skutterudites are prospective intermediate temperature materials for thermoelectric power generation. CoSb 3 -based n-type filled skutterudites have good electrical transport properties with power factor values over 40 lW/cm K 2 at elevated temperatures. Filling multiple fillers into the crystallographic voids of skutterudites would help scatter a broad range of lattice phonons, thus resulting in lower lattice thermal conductivity values. We report the thermoelectric properties of n-type multiple-filled skutterudites between 5 K and 800 K. The combination of different fillers inside the voids of the skutterudite structure shows enhanced phonon scattering, and consequently a strong suppression of the lattice thermal conductivity. Very good power factor values are achieved in multiple-filled skutterudite compared with single-element-filled materials. The dimensionless thermoelectric figure of merit for n-type filled skutterudites is improved through multiple-filling in a wide temperature range.

show abstract

“…A large number of theoretical calculations have been performed to understand the band structures in M x Co 4 Sb 12 with the main focus being on the correlation with the measured transport properties [11]- [15]. In Ca x Co 4 Sb 12 for example, an increase in the Ca concentration is accompanied by increased Fermi-level density of states (DOS), N (E F ), and an otherwise minor change in the band structures [15].…”

Section: Introductionmentioning

confidence: 99%

“…In Ca x Co 4 Sb 12 for example, an increase in the Ca concentration is accompanied by increased Fermi-level density of states (DOS), N (E F ), and an otherwise minor change in the band structures [15]. Such a result seems to imply that a band-filling picture would be suitable for explaining the sign and trend of the Seebeck coefficients [16], because the filling of the divalent Ca ions has the same effect as doping electrons to CoSb 3 [17].…”

Section: Introductionmentioning

confidence: 99%

“…Such a result seems to imply that a band-filling picture would be suitable for explaining the sign and trend of the Seebeck coefficients [16], because the filling of the divalent Ca ions has the same effect as doping electrons to CoSb 3 [17]. Although there are many theoretical reports related to this band-filling scenario [11]- [15], there has been little associated experimental work, which is, however, essential for providing a microscopic insight into the band structure variation as filling atoms are added in the voids of CoSb 3 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of partial La filling on the local electronic properties of La_xCo₄Sb₁₂studied using⁵⁹Co NMR

et al. 2008

View full text Add to dashboard Cite

Abstract. We present a systematic investigation of the La x Co 4 Sb 12 skutterudites with x 0.2 using 59 Co nuclear magnetic resonance (NMR) spectroscopy. The NMR line shape, the quadrupole splitting, the Knight shift and the spin-lattice relation rate of each compound have been identified. For La x Co 4 Sb 12 , the central transition and the quadrupole linewidths increase with the La concentration because of the effect of the inhomogeneous electric field gradient. In addition, each linewidth exhibits a temperature-independent behavior, confirming the non-magnetic characteristic of these materials. The results of the isotropic Knight shift and the spin-lattice relaxation rate provide further information on the electronic structure around the Fermi surfaces of these compounds. In La 0.1 Co 4 Sb 12 and La 0.2 Co 4 Sb 12 , the low-temperature NMR relaxation rates follow the Korringa behavior, indicating a finite density of carriers at the Fermi level. The high-temperature relaxation rates go over to a semiconductor-like activated form, being consistent with a semimetallic response. A detailed analysis of the spin-lattice relaxation rate established that the partial Co 3d Fermi-level density of states (DOS) increases with the La content. The NMR observations were interpreted in terms of a two-band scenario that consists of predominant d-electron features at low temperatures and exotic behavior of s-character electrons at high temperatures. Moreover, the obtained Fermi-level DOS show good agreement with those observed from the electrical conductivity and the Seebeck coefficient measurements in these La-filled skutterudites.

show abstract

Electronic, transport, and magnetic properties ofCaxCo4Sb12partially filled skutterudites

Cited by 55 publications

References 44 publications

Lattice dynamics in the FeSb3skutterudite

Lattice dynamics in the FeSb3skutterudite

Thermoelectric Properties of n-Type Multiple-Filled Skutterudites

Effect of partial La filling on the local electronic properties of La_xCo₄Sb₁₂studied using⁵⁹Co NMR

Contact Info

Product

Resources

About

Electronic, transport, and magnetic properties ofCaxCo4Sb12partially filled skutterudites

Cited by 55 publications

References 44 publications

Lattice dynamics in the FeSb3skutterudite

Lattice dynamics in the FeSb3skutterudite

Thermoelectric Properties of n-Type Multiple-Filled Skutterudites

Effect of partial La filling on the local electronic properties of LaxCo4Sb12studied using59Co NMR

Contact Info

Product

Resources

About

Effect of partial La filling on the local electronic properties of La_xCo₄Sb₁₂studied using⁵⁹Co NMR