Recent Progress in the Development of Thermoelectric Materials with Complex Crystal Structures

Paschen, S.; Godart, C.; Grin, Yuri

doi:10.1002/9783527632718.ch9

Cited by 6 publications

(8 citation statements)

References 95 publications

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“…For comparison, the total and lattice thermal conductivities for the Cu-containing analogue at room temperature are 3.6 and 2.9 W m –1 K –1 , respectively . Generally, for the majority of clathrates, κ lattice at room temperature is ∼1 W m –1 K –1 , and for certain compounds it decreases to 0.5 W m –1 K –1 . , It should be noted that low thermal conductivity is accompanied with a high degree of structural disorder that results in glasslike thermal conductivity behavior, unlike Ba 8 Au 16 P 30 . For other classes of thermoelectric materials, a brief summary of room-temperature κ lattice values was recently reported .…”

Section: Resultsmentioning

confidence: 99%

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Clathrate Ba₈Au₁₆P₃₀: The “Gold Standard” for Lattice Thermal Conductivity

Fulmer¹,

et al. 2013

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A novel clathrate phase, Ba8Au16P30, was synthesized from its elements. High-resolution powder X-ray diffraction and transmission electron microscopy were used to establish the crystal structure of the new compound. Ba8Au16P30 crystallizes in an orthorhombic superstructure of clathrate-I featuring a complete separation of gold and phosphorus atoms over different crystallographic positions, similar to the Cu-containing analogue, Ba8Cu16P30. Barium cations are trapped inside the large polyhedral cages of the gold-phosphorus tetrahedral framework. X-ray diffraction indicated that one out of 15 crystallographically independent phosphorus atoms appears to be three-coordinate. Probing the local structure and chemical bonding of phosphorus atoms with (31)P solid-state NMR spectroscopy confirmed the three-coordinate nature of one of the phosphorus atomic positions. High-resolution high-angle annular dark-field scanning transmission electron microscopy indicated that the clathrate Ba8Au16P30 is well-ordered on the atomic scale, although numerous twinning and intergrowth defects as well as antiphase boundaries were detected. The presence of such defects results in the pseudo-body-centered-cubic diffraction patterns observed in single-crystal X-ray diffraction experiments. NMR and resistivity characterization of Ba8Au16P30 indicated paramagnetic metallic properties with a room-temperature resistivity of 1.7 mΩ cm. Ba8Au16P30 exhibits a low total thermal conductivity (0.62 W m(-1) K(-1)) and an unprecedentedly low lattice thermal conductivity (0.18 W m(-1) K(-1)) at room temperature. The values of the thermal conductivity for Ba8Au16P30 are significantly lower than the typical values reported for solid crystalline compounds. We attribute such low thermal conductivity values to the presence of a large number of heavy atoms (Au) in the framework and the formation of multiple twinning interfaces and antiphase defects, which are effective scatterers of heat-carrying phonons.

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Section: Resultsmentioning

confidence: 99%

“…Another approach, the “phonon glass–electron crystal” (PGEC) concept, suggests the use of perfectly crystalline compounds containing loosely bonded atoms inside oversized cages. These materials are expected to have low thermal conductivities and low electrical resistivities.…”

Section: Introductionmentioning

confidence: 99%

Clathrate Ba₈Au₁₆P₃₀: The “Gold Standard” for Lattice Thermal Conductivity

Fulmer¹,

et al. 2013

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“…Their spectrum ranges from compounds with complex structures like Chevrel phases, Zintl phases, cage compounds (clathrates, skutterudites), or Heusler phases to nanostructured variants of such materials. 1 Variation of chemical composition or mechanical properties of the known TE materials is considered as a way to enhance the thermoelectric figure of merit (ZT). But beyond this task, from the chemical point of view, the search for new materials, in which the understanding of the relation between crystal structure, chemical bonding, and TE property may present better ways to enhance the TE properties, is still an open field to be explored.…”

Section: Introductionmentioning

confidence: 99%

RuIn_3-xSn_x, RuIn_3-xZn_x, and Ru_1-yIn₃—new thermoelectrics based on the semiconductor RuIn₃

et al. 2011

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A systematic investigation of the intermetallic phase Ru 1-y In 3 (0 # y # 0.025) and its substitution derivatives RuIn 3-x Sn x and RuIn 3-x Zn x (x 5 0.01, 0.025, 0.05, and 0.1) is performed. The samples were prepared from a liquid-solid reaction of components with subsequent spark plasma sintering treatment. Ru 1-y In 3 exhibits n-and p-type behavior crossing over from low to high temperatures. Substitution of indium by tin or zinc up to 2.5 at.% leads to an increase of the charge carrier concentration, with negative (Sn) or positive (Zn) Seebeck values, respectively. The electrical resistivity was P changed from semiconductor-to metal-like properties by substitution, whereas the thermal conductivity was reduced down to 50% of that of RuIn 3 . Higher values of the thermoelectric figure of merit were achieved by chemical substitution (RuIn 3-x Sn x , RuIn 3-x Zn x ), opening up a possibility for tuning the thermoelectric properties in this class of materials.

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“…Intermetallic type-I clathrates A 8 E 46 that contain E 20 and E 24 polyhedra are among the most promising compounds for TE applications [3]. This is particularly true for Ge-based clathrates for which competitive ZT values have been reached.…”

Section: Accepted Manuscriptmentioning

confidence: 98%

“…Intermetallic clathrates are CMA in which heavy elements are located in cavities formed by lighter framework atoms. Their structural features make them promising for thermoelectric (TE) application [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of PCA on thermoelectric properties and hardness of nanostructured Ba–Cu–Si clathrates

et al. 2015

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Nanostructuring has been considered an effective approach to enhance the thermoelectric (TE) performance of materials by reducing their lattice thermal conductivity. In the present study, we show the influence of a process control agent (PCA) for ball milling, Stearic acid (SA), on the nano-and microstructure and thermoelectric properties of type-I clathrates in the Ba-Cu-Si system, which are promising candidates for TE applications. The SA effectively reduces cold welding and prevents particle agglomeration during ball milling. Consequently, it increases the powder yield and the milling efficiency. Smaller grain/crystallite sizes are obtained in the asmilled powders than without SA. Importantly, the SA forms nano-layers around the clathrate particles, which inhibit the grain growth during the hot pressing process used for powder compaction. Therefore, smaller grain sizes are also obtained in the hot-pressed samples. They show increased hardness and reduced thermal conductivity but also increased electrical resistivity. However, as the phonon transport is more strongly degraded than the charge * Corresponding authors. ACCEPTED MANUSCRIPT2 transport, we observe 15 % enhancement in the dimensionless thermoelectric figure of merit ZT by adding the PCA.

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Recent Progress in the Development of Thermoelectric Materials with Complex Crystal Structures

Cited by 6 publications

References 95 publications

Clathrate Ba₈Au₁₆P₃₀: The “Gold Standard” for Lattice Thermal Conductivity

Clathrate Ba₈Au₁₆P₃₀: The “Gold Standard” for Lattice Thermal Conductivity

RuIn_3-xSn_x, RuIn_3-xZn_x, and Ru_1-yIn₃—new thermoelectrics based on the semiconductor RuIn₃

Influence of PCA on thermoelectric properties and hardness of nanostructured Ba–Cu–Si clathrates

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Recent Progress in the Development of Thermoelectric Materials with Complex Crystal Structures

Cited by 6 publications

References 95 publications

Clathrate Ba8Au16P30: The “Gold Standard” for Lattice Thermal Conductivity

Clathrate Ba8Au16P30: The “Gold Standard” for Lattice Thermal Conductivity

RuIn3-xSnx, RuIn3-xZnx, and Ru1-yIn3—new thermoelectrics based on the semiconductor RuIn3

Influence of PCA on thermoelectric properties and hardness of nanostructured Ba–Cu–Si clathrates

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Product

Resources

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Clathrate Ba₈Au₁₆P₃₀: The “Gold Standard” for Lattice Thermal Conductivity

Clathrate Ba₈Au₁₆P₃₀: The “Gold Standard” for Lattice Thermal Conductivity

RuIn_3-xSn_x, RuIn_3-xZn_x, and Ru_1-yIn₃—new thermoelectrics based on the semiconductor RuIn₃