Crystal structure and high temperature transport properties of Yb-filled p-type skutterudites YbxCo2.5Fe1.5Sb12

Dong, Yongkwan; Puneet, Pooja; Tritt, Terry M.; Nolas, George S.

doi:10.1016/j.jssc.2013.10.009

Cited by 19 publications

(22 citation statements)

References 29 publications

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“…13 In 0.02 Co 3 FeSb 12 and Yb 0.39 In 0.02 Co 2.4 Fe 1.6 Sb 12 , respectively, with an increase in lattice parameter with Yb and In filling fractions and Co-to-Fe ratio, in agreement with previously reported data. Furthermore, the Yb filling fraction increases from 33% to 49% with increased Fe substitution, similarly reported for Gd and (Ba, Yb) filled skutterudites [10][11][12][13][14][15][16][17]. Elemental mapping from EDS data shows an even dispersion of elements for both specimens, indicating good homogeneity of the specimens, and corroborate our refinement results.…”

Section: Structural Characterizationsupporting

confidence: 90%

“…Yb) filled skutterudites [10][11][12][13][14][15][16][17]. Elemental mapping from EDS data shows an even dispersion of elements for both specimens, indicating good homogeneity of the specimens, and corroborate our refinement results.…”

Section: Structural Characterizationsupporting

confidence: 86%

“…The high-purity elements were weighed and loaded into silica crucibles in a N 2 for this study, which were chosen based off of previous studies of Yb single-filled Fe substituted skutterudites [11,12]. The specimens were sealed in a quartz tube under vacuum and reacted in a furnace at 1173 K for 48 h. The tube was removed and allowed to cool to room temperature in air before the specimens were ground into fine powders in a N 2 glove box and cold pressed into pellets.…”

Section: Methodsmentioning

confidence: 99%

“…Table 1 indicates the refinement results. The crystal structures were refined with space group Im3 (#204), and the initial atomic positions were based on data from previously reported Yb filled skutterudites [11,12]. The filler Yb atoms at the 2a site occupy less than the nominal composition, due in part to a trace amount of Yb 2 O 3 (observed in profiles at 29.7 • ) and to steric effects [11,12,15,16].…”

Section: Structural Characterizationmentioning

confidence: 99%

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High Temperature Transport Properties of Yb and In Double-Filled p-Type Skutterudites

et al. 2017

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Yb and In double-filled and Fe substituted polycrystalline p-type skutterudite antimonides were synthesized by direct reaction of high-purity elements, followed by solid-state annealing and densification by hot pressing. The stoichiometry and filling fraction were determined by both Rietveld refinement of the X-ray diffraction data and energy dispersive spectroscopic analyses. The transport properties were measured between 300 K and 830 K, and basically indicate that the resistivity and Seebeck coefficient both increase with increasing temperature. In both specimens, the thermal conductivity decreased with increasing temperature up to approximately 700 K, where the onset of bipolar conduction was observed. A maximum ZT value of 0.6 at 760 K was obtained for the Yb 0.39 In 0.018 Co 2.4 Fe 1.6 Sb 12 specimen.

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Section: Structural Characterizationsupporting

confidence: 90%

Section: Structural Characterizationsupporting

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Section: Structural Characterizationmentioning

confidence: 99%

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High Temperature Transport Properties of Yb and In Double-Filled p-Type Skutterudites

et al. 2017

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“…It should be also very important to note here that the (Fe,Co)Sb 3 -based p-type skutterudites generally indicate higher lling fraction than that in CoSb 3 -based n-type samples due to the expanded volume of vacant sites. [15][16][17] Among the ller candidates, we selected In as an appropriate ller element, because group 13 elements were reported to cause excellent TE properties for n-type lled skutterudites. [18][19][20][21] In deed, an indium (In) lled CoSb 3 exhibits the highest zT exceeding unity.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Properties of InxFeCo3Sb12 Consisting Mainly of In-Filled p-Type Skutterudites

et al. 2017

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Indium (In)-lled CoSb 3 skutterudite is known as a good n-type thermoelectric (TE) material. Its p-type samples have not been intensively studied. In this study, we tried to reduce the electron concentration of (In)-lled CoSb 3 by substitute Fe atoms for 1/4 of Co atoms in In x Co 4 Sb 12 . Polycrystalline samples were prepared with the nominal compositions of In x FeCo 3 Sb 12 (x = 0.3, 0.5, 0.7, and 0.9) and their constituent phases, microstructure, high-temperature TE properties were carefully investigated. All the samples showed positive sign of Seebeck coef cient as we expected from the nominal compositions. The lling fraction of In in In x FeCo 3 Sb 12 , was revealed to extend to the value of x = 0.43. The largest dimensionless gure of merit zT = 0.39 was observed at 705 K for the sample prepared at x = 0.5.

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Thermoelectric Materials

Owens‐Baird

Heinrich

Kovnir

2017

Encyclopedia of Inorganic and Bioinorganic Chemistry

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The field of thermoelectric materials has flourished over the last two decades. Significant successes achieved in the development of materials notwithstanding, novel and highly efficient materials are in steep demand due to a wide range of potential and current applications, ranging from wearable electronics to space missions. The main challenge in the improvement of the thermoelectric figure of merit ( zT ) is to optimize the intertwined intrinsic charge and thermal transport properties. High electrical conductivity and thermopower, along with low thermal conductivity, need to be achieved simultaneously to excel the thermoelectric efficiency. In this review, the thermoelectric concepts, basics of transport properties, and strategies for zT optimization are discussed in the first section. In the following sections, the predominate structure types associated with high‐performance bulk thermoelectric materials are discussed in detail: Bi 2 Te 3 , PbTe, TAGS/LAST systems, SnSe, Cu 2− x Se, chalcopyrites, tetrahedrites, clathrates, skutterudites, zinc antimonides, Yb 14 MnSb 11 , Heusler and half‐Heusler intermetallics. The basic crystal structures, the possibilities for doping and substitutions to adjust charge carrier concentration and thermal conductivity, baseline thermoelectric properties, and strategies for efficiency improvement are considered for each structure type. Examples of recent work highlighting these strategies are briefly presented.

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Crystal structure and high temperature transport properties of Yb-filled p-type skutterudites YbxCo2.5Fe1.5Sb12

Cited by 19 publications

References 29 publications

High Temperature Transport Properties of Yb and In Double-Filled p-Type Skutterudites

High Temperature Transport Properties of Yb and In Double-Filled p-Type Skutterudites

Thermoelectric Properties of In<i><sub>x</sub></i>FeCo<sub>3</sub>Sb<sub>12</sub> Consisting Mainly of In-Filled <i>p</i>-Type Skutterudites

Thermoelectric Materials

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