Optimization of thermoelectric properties of type-VIII clathrate Ba8Ga16Sn30 by carrier tuning

Saiga, Yasuhiro; Suekuni, Koichiro; Deng, Shukang; Yamamoto, Tetsuya; Kono, Y.; Ohya, Nobuyuki; Takabatake, T.

doi:10.1016/j.jallcom.2010.07.121

Cited by 55 publications

(66 citation statements)

References 22 publications

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“…Presence of doped Sb and high Ga content in the single crystal have been confirmed by EPMA analysis. According to the experimental results reported by Saiga et al, the maximum ZT values for both p-type BGS-VIII and BGSS-VIII are approximately 1.0 at around 450 K. 6) The carrier concentration of p-type BGS-VIII samples is 1.4 © 10 26 m ¹3 , but that of BGSS-VIII samples is unknown. The thermoelectric properties of a compound are strongly affected by its carrier concentration, so the effect of Sb substitution in BGS-VIII remains unclear.…”

Section: )mentioning

confidence: 95%

“…7,8) On the other hand, Sb-doped p-type BGS-VIII has high ZT value. 6,24) According to the Zintl concept for the clathrate, 25) electron carrier doping is realized by the partial substitution of Sb(5s 2 5p…”

Section: )mentioning

confidence: 99%

“…Nevertheless, hole-carriers are introduced by the codoping of Sb and Ga(4s 2 4p 1 ) for BGS-VIII. 24) A single crystal of Sb-doped BGS-VIII (BGSS-VIII) has been synthesized using a self-flux method, 6,24) and its crystal structure has been confirmed by powder X-ray diffraction analysis. Presence of doped Sb and high Ga content in the single crystal have been confirmed by EPMA analysis.…”

Section: )mentioning

confidence: 99%

“…EPMA analysis 6) 24) it became clear that the site occupation probability of Ga at the 2a site increases as Sb composition increases. However, doped Sb-sites have not been determined.…”

Section: Band Structure and Density Of States Calculationmentioning

confidence: 99%

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Electronic Structures and Thermoelectric Properties of Sb-Doped Type-VIII Clathrate Ba8Ga16Sn30

et al. 2012

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Section: )mentioning

confidence: 95%

Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

“…EPMA analysis 6) 24) it became clear that the site occupation probability of Ga at the 2a site increases as Sb composition increases. However, doped Sb-sites have not been determined.…”

Section: Band Structure and Density Of States Calculationmentioning

confidence: 99%

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Electronic Structures and Thermoelectric Properties of Sb-Doped Type-VIII Clathrate Ba8Ga16Sn30

et al. 2012

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“…Additionally, chemical reactions or mechanical moving parts are no longer needed. Many previous studies focused on the improvement of the inherent properties of thermoelectric materials [1][2][3][4][5] . However, the low conversion efficiency is still a distinct disadvantage [6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Analysis for Helical Power Generation Systems

Meng

Fujisaka

Suzuki

2013

Journal of Elec Materi

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Because the conversion efficiency of thermoelectric (TE) is still an issue, the performance of a three-dimensional helical thermoelectric generation (TEG) system is examined by exposing it to a temperature difference with hot and cold sources. The helical paths for the two thermal fluids give the TEG device the potential to efficiently convert thermal energy. The characteristic performances of the helical system are numerically analyzed by using the finite-volume method in a compact system. The helical system is compared with a straight system in which all the TE elements are established to have an equivalent geometry. The difference between the TE performances of the two systems is not significant when the TE surfaces are maintained at constant temperatures. Therefore, the helical system is a reasonable and feasible design because of its merits, such as compactness and larger and homogenous temperature difference. Both the electromotive force and the current in the TEG system increase linearly with a temperature difference T applied at the two module surfaces. However, the TE performance is affected by the geometry of the helical system. The current preferentially flows through a mainstream path determined by the geometry of the TE element.

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Correlated Rattling of Sodium‐Chains Suppressing Thermal Conduction in Thermoelectric Stannides

et al. 2023

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Tin‐based intermetallics with tunnel frameworks containing zigzag Na chains that excite correlated rattling impinging on the framework phonons are attractive as thermoelectric materials owing to their low lattice thermal conductivity. The correlated rattling of Na atoms in the zigzag chains and the origin of the low thermal conductivity is uncovered via experimental and computational analyses. The Na atoms behave as oscillators along the tunnel, resulting in substantial interactions between Na atoms in the chain and between the chain and framework. In these intermetallic compounds, a shorter inter‐rattler distance results in lower thermal conductivity, suggesting that phonon scattering by the correlated rattling Na‐chains is enhanced. These results provide new insights into the behavior of thermoelectric materials with low thermal conductivity and suggest strategies for the development of such materials that utilize the correlated rattling.

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Optimization of thermoelectric properties of type-VIII clathrate Ba8Ga16Sn30 by carrier tuning

Cited by 55 publications

References 22 publications

Electronic Structures and Thermoelectric Properties of Sb-Doped Type-VIII Clathrate Ba<sub>8</sub>Ga<sub>16</sub>Sn<sub>30</sub>

Electronic Structures and Thermoelectric Properties of Sb-Doped Type-VIII Clathrate Ba<sub>8</sub>Ga<sub>16</sub>Sn<sub>30</sub>

Thermoelectric Analysis for Helical Power Generation Systems

Correlated Rattling of Sodium‐Chains Suppressing Thermal Conduction in Thermoelectric Stannides

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