From Occupied Voids to Nanoprecipitates: Synthesis of Skutterudite Nanocomposites in situ

Eilertsen, James; Surace, Yuri; Balog, Sandor; Sagarna, Leyre; Rogl, Gerda; Horky, Jelena; Trottmann, Matthias; Rogl, P.; Subramanian, M. A.; Weidenkaff, Anke

doi:10.1002/zaac.201500137

Cited by 5 publications

(3 citation statements)

References 51 publications

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“…The electron is not easy to be scattered because of the size of the nanoscale second-phase is much larger than the mean free path of the electron, which has little effect on the electrical properties. The preparation of CoSb 3 -based nanocomposites by in-situ generation [78,[167][168][169][170][171][172][173][174][175][176][177] or mechanical addition of nanoinclusions [178][179][180][181][182][183][184][185][186][187][188][189][190][191][192][193] is a common method to introduce the second phase. In x Ce y Co 4 Sb 12 nanocomposites containing in-situ formed InSb nanophases (10-80 nm) were prepared by melt quenching, annealing, and spark plasma sintering [78], as shown in Figs.…”

Section: Low Dimensionalmentioning

confidence: 99%

A review of CoSb3-based skutterudite thermoelectric materials

et al. 2020

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The binary skutterudite CoSb3 is a narrow bandgap semiconductor thermoelectric (TE) material with a relatively flat band structure and excellent electrical performance. However, thermal conductivity is very high because of the covalent bond between Co and Sb, resulting in a very low ZT value. Therefore, researchers have been trying to reduce its thermal conductivity by the different optimization methods. In addition, the synergistic optimization of the electrical and thermal transport parameters is also a key to improve the ZT value of CoSb3 material because the electrical and thermal transport parameters of TE materials are closely related to each other by the band structure and scattering mechanism. This review summarizes the main research progress in recent years to reduce the thermal conductivity of CoSb3-based materials at atomic-molecular scale and nano-mesoscopic scale. We also provide a simple summary of achievements made in recent studies on the non-equilibrium preparation technologies of CoSb3-based materials and synergistic optimization of the electrical and thermal transport parameters. In addition, the research progress of CoSb3-based TE devices in recent years is also briefly discussed.

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Section: Low Dimensionalmentioning

confidence: 99%

A review of CoSb3-based skutterudite thermoelectric materials

et al. 2020

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“…InSb usually observed at the grain boundaries of saturated In-filled skutterudite [12,35]. However, the In content in the structure remains constant as indicated by the similar lattice parameter, a = 9.0520(3) Å, determined after the thermoelectric characterization.…”

Section: Thermoelectric Propertiesmentioning

confidence: 75%

Reaction mechanism and thermoelectric properties of In0·22Co4Sb12 prepared by magnesiothermy

Tonquesse

Alleno

Demange

et al. 2020

Materials Today Chemistry

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The magnesioreduction synthesis of In 0.22 Co 4 Sb 12 with high In-rattler concentration from Sb 2 O 4 and In-doped Co 3 O 4 precursors is reported. This process directly yields a submicronic powder in a single step of 96 h at 810 K. The reaction mechanism has been investigated by stopping the reaction every 12 h and quantifying the existing phases by X-ray diffraction and Rietveld refinements. The precursors are first reduced in CoO and Sb 2 O 3 lower oxides, then form CoSb 2 O 6 and CoSb 2 O 4 intermediates which are finally reduced in In x Co 4 Sb 12 . A powder with 350 nm average size and mostly composed of In-filled skutterudite phase with composition close to In 0.17 Co 4 Sb 12 is obtained. Upon spark plasma sintering, small residual amount of InSb reacts with the skutterudite matrix to form a single-phase densified pellet with composition close to In 0.22 Co 4 Sb 12 .The resulting densified material with 1.8 µm average grain size shows a figureof-merit ZT max of 0.95 at 750 K.

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“…Cage structures such as skutterudites or filled skutterudites (e.g. CeFe 4 Sb 12 ) and Sior Ge-based clathrates reveal a complex crystal structure with "rattling" atoms and very low thermal conductivity [20,21]. They can be nanostructured by e.g.…”

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confidence: 99%

Thermoelectricity for future sustainable energy technologies

Weidenkaff

2017

EPJ Web Conf.

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Summary. -Thermoelectricity is a general term for a number of effects describing the direct interconversion of heat and electricity. Thermoelectric devices are therefore promising, environmental-friendly alternatives to conventional power generators or cooling units. Since the mid-90s, research on thermoelectric properties and their applications has steadily increased. In the course of years, the development of high-temperature resistant TE materials and devices has emerged as one of the main areas of interest focusing both on basic research and practical applications. A wide range of innovative and cost-efficient material classes has been studied and their properties improved. This has also led to advances in synthesis and metrology. The paper starts out with thermoelectric history, basic effects underlying thermoelectric conversion and selected examples of application. The main part focuses on thermoelectric materials including an outline of the design rules, a review on the most common materials and the feasibility of improved future high-temperature thermoelectric converters.

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From Occupied Voids to Nanoprecipitates: Synthesis of Skutterudite Nanocomposites in situ

Cited by 5 publications

References 51 publications

A review of CoSb3-based skutterudite thermoelectric materials

A review of CoSb3-based skutterudite thermoelectric materials

Reaction mechanism and thermoelectric properties of In0·22Co4Sb12 prepared by magnesiothermy

Thermoelectricity for future sustainable energy technologies

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