Effect of HPHT Processing on Structural and Thermoelectric Properties of Low-Cost Type-I Clathrate Ba8Cu6Si40

Sun, Bing; Zhao, Jianhua; Li, Yingde; Cao, Liqin; Yang, Yang; Fan, Xinjian; Liu, Xia; Wang, Chunyan; Huang, Xiaodong; Wang, Xinle; Sun, Yongzhi; Ma, Hongan

doi:10.1021/acs.jpcc.0c02045

Cited by 9 publications

(10 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such a high density of grain boundaries should be attributed to the HPHT synthesis method. Previous work has confirmed that the HPHT method could generate nanograins and observably suppress grain growth in multiple thermoelectric systems, including Bi 2 Te 3 -, CoSb 3 -, and Ba 8 Si 46 -based systems, thus enhancing the density of grain boundaries. − Figure B shows a close-up of the grain boundary area, exhibiting an incoherent nature that should consist of geometrical necessary dislocations. The corresponding fast Fourier transform (FFT) analyses and atomic models for the upper and bottom grains (Figure B) are illustrated in Figure C1,C2, respectively.…”

Section: Resultsmentioning

confidence: 63%

Synergistically Optimized Electron and Phonon Transport of Polycrystalline BiCuSeO via Pb and Yb Co-Doping

Yin

Liu

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Polycrystalline BiCuSeO is considered as a promising thermoelectric material due to its intrinsically low thermal conductivity and moderate Seebeck coefficient. However, its low electrical conductivity and coupled electron−phonon transport properties restrict the further improvement of the thermoelectric performance. In this work, Pb and Yb dopants are incorporated into BiCuSeO to substitute for Bi sites via ball milling and high-pressure and high-temperature sintering, leading to a synergistic optimization of the electron and phonon transport and improved thermoelectric performance. The carrier concentration exhibits an enhancement with increasing Pb&Yb co-doping contents. Meanwhile, the decreased carrier mobility is suppressed appropriately by coordinating with the interplay of Pb and Yb dopants on the electronic structure. Besides, Pb&Yb co-doping combined with high-pressure and high-temperature sintering introduces abundant grain boundaries, dislocations, and point defects to effectively decrease the lattice thermal conductivity by scattering phonons in a broad frequency range. Coupled with the synergistic optimization of the electrical and thermal properties, a maximum zT of 1.2 is achieved in Bi 0.88 Pb 0.06 Yb 0.06 CuSeO at 850 K, which significantly outperforms the majority of oxygen-containing thermoelectric materials. Our study suggests that dual doping of bivalent ions and rare-earth elements at Bi sites is an effective strategy for improving the thermoelectric performance of BiCuSeO.

show abstract

Section: Resultsmentioning

confidence: 63%

Synergistically Optimized Electron and Phonon Transport of Polycrystalline BiCuSeO via Pb and Yb Co-Doping

Yin

Liu

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Until now, synergistically regulating carrier and phonon transport on the same scale is extremely difficult for all TE materials without cage structures. For those TE materials with cage structures such as skutterudite and clathrate, one can use different atoms to fill the cages to optimize the band structure and to provide scattering centers for phonon, realizing simultaneous regulation of carrier and phonon transport on the atomic scale [3][4][5][6]. However, for all other TE materials, one can only separately tune electric transport properties by band engineering on the atomic scale [7][8][9][10], and/or thermal transport properties by phonon engineering on the nanoscale [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Magneto-enhanced electro-thermal conversion performance

Cui

et al. 2021

Sci. China Mater.

View full text Add to dashboard Cite

Synergistically regulating carrier and phonon transport on the nanoscale is extremely difficult for all thermoelectric (TE) materials without cage structures. Herein BaFe 12 O 19 /Bi 2 Te 2.5 Se 0.5 thermoelectromagnetic nanocomposites are designed and synthesized as a benchmarking example to simultaneously tailor the transport properties on the nanoscale. A magneto-trapped carrier effect induced by BaFe 12 O 19 hard-magnetic nanoparticles (NPs) is discovered, which can lower the carrier concentration of n-type Bi 2 Te 2.5 Se 0.5 matrix by 16%, and increase the Seebeck coefficient by 16%. Meanwhile, BaFe 12 O 19 NPs provide phonon scattering centers and reduce the thermal conductivity by 12%. As a result, the ZT value of the nanocomposites is enhanced by more than 25% in the range of 300-450 K, and the cooling temperature difference increases by 65% near room temperature. This work greatly broadens the commercial application potential of ntype Bi 2 Te 2.5 Se 0.5 , and demonstrates magneto-trapped carrier effect as a universal strategy to enhance the electro-thermal conversion performance of TE materials with high carrier concentration.

show abstract

“…The ordered arrangement has been elaborated in section 2 according to the crystal structure. In addition, Sun et al showed that implementing pressure during the synthesis process of Ba 8 Cu 6 Si 40 not only can manipulate grain sizes, but can change the surface morphology of grains (figures 5(E) and (F)) [126]. The researchers claimed that pressure-induced changes were rare happened in surface characteristics of grains, it might need to be investigated further to reveal the intrinsic mechanism of pressure modulating the surface crystallization.…”

Section: Microstructural Evolution With Pressurementioning

confidence: 99%

A review of pressure manipulating structure and performance in thermoelectrics

Zhang

Gregory

et al. 2023

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Pressure is a fundamental thermodynamic variable that can create exotic materials and modulate transport properties, motivating prosperous progress in multiple fields. As for inorganic thermoelectric materials, pressure is an indispensable condition during a preparation process, which is employed to compress raw powders into the specific shape of solid-state materials for performing properties characterization. In addition to this function, the extra influence of pressure on thermoelectric performance is frequently underestimated and even overlooked. In this review, we summarize recent progress and achievements of pressure-induced structure and performance in thermoelectrics, emphatically involving the modulation of pressure on crystal structure, electrical transport properties, microstructure, and thermal conductivity. According to various studies, the modulated mechanism of pressure on these items above has been discussed in detail, and the perspectives and strategies have been proposed with respect to applying pressure to improve thermoelectric performance. Overall, the purpose of the review is supposed to enrich the understanding of the mechanisms in pressure-induced transport properties and provide a guidance to rationally design a structural pattern to improve thermoelectric performance.

show abstract

Effect of HPHT Processing on Structural and Thermoelectric Properties of Low-Cost Type-I Clathrate Ba₈Cu₆Si₄₀

Cited by 9 publications

References 32 publications

Synergistically Optimized Electron and Phonon Transport of Polycrystalline BiCuSeO via Pb and Yb Co-Doping

Synergistically Optimized Electron and Phonon Transport of Polycrystalline BiCuSeO via Pb and Yb Co-Doping

Magneto-enhanced electro-thermal conversion performance

A review of pressure manipulating structure and performance in thermoelectrics

Contact Info

Product

Resources

About