Effect of Nano-ZrW2O8 on the Thermoelectric Properties of Bi85Sb15/ZrW2O8 Composites

Zhou, Min; Chen, Zhe; Chu, Xinxin; Li, Laifeng

doi:10.1007/s11664-012-1914-z

Cited by 6 publications

(15 citation statements)

References 14 publications

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“…Günes et al found smaller resistivity of about 0.33 mΩ.cm for x = 0.05 compared to the samples with higher Sb content [40], but which is larger than in our samples with x = 0.05. When examining the resistivity of SPS-densified samples for the range x = 0.1-0.15 in the literature, the values are close to our results [35,36,42,44]. Specifically, Flores-Conde et al found a resistivity of about 0.3-0.4 mΩ.cm [42].…”

Section: Transport and Thermoelectric Propertiessupporting

confidence: 91%

“…Devaux et al studied the thermoelectric properties of a Bi 0.865 Sb 0.135 alloy after cold pressing, eventually followed by pressureless sintering, and observed degraded ZT values for the samples with 100 nm grain size [28], but this degradation could be due to the low density of the pellet. Mechanical alloying has been the main technique used for nanostructuring Bi 1−x Sb x alloys [5,20,[29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. In some works, it was shown that grain size of about 30-100 nm can be obtained by mechanical alloying [34,[38][39][40].…”

Section: Introductionmentioning

confidence: 99%

“…SPS was also used for shaping Bi 1−x Sb x alloys obtained by melt spinning [21,22]. SPS was used in a limited number of studies devoted to mechanically alloyed powders of Bi 1−x Sb x alloys [35,36,42,44]. Chen et al found that such samples after SPS have a grain size of 200 nm [36].…”

Section: Introductionmentioning

confidence: 99%

“…Chen et al found that such samples after SPS have a grain size of 200 nm [36]. Almost all the works reporting the thermoelectric properties of Bi 1−x Sb x alloys obtained by mechanical alloying focused on Sb content in the range 10-15% [5,20,[30][31][32][33][34][35][36][37][42][43][44], corresponding to the semiconducting compositions with a direct bandgap [3,17]. In contrast, some groups explored compositions with x > 0.15 [38][39][40][41], whereas Günes et al reported on the thermoelectric properties of two samples with x < 0.1 at room temperature [37] and Miyajima reported the thermoelectric properties for a sample with x = 0.075 at room temperature [29].…”

Section: Introductionmentioning

confidence: 99%

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Lattice Dynamics, Transport and Thermoelectric Properties of Bi-Sb Alloys Obtained by Mechanical Alloying and Spark Plasma Sintering

Viennois,

Alvarez,

Coulomb

et al. 2023

Metals

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We report on the successful synthesis of Bi1−xSbx alloys via mechanical alloying followed by sintering via spark plasma sintering, and the study of their lattice dynamics by Raman spectroscopy as well as their transport and thermoelectric properties. We observed an upshift of the frequency of the Raman-active Eg vibrational mode with increasing Sb content but no significant change for the frequency of the Raman-active A1g vibrational mode. Conversely, the linewidth of the Eg vibrational mode did not change significantly with increasing Sb content, whereas a twofold increase was observed for the A1g vibrational mode. Moreover, we confirm the emergence of several new vibrational modes with Sb alloying that could be associated with Bi-Sb and Sb-Sb vibrations. Rather large magnetoresistance was observed for all samples at room temperature. From the Seebeck coefficients, we determined the energy bandgaps in our samples, which are larger than those in bulk compounds, presumably due to the electronic confinement effect. We report a rather large thermoelectric power factor of 2–3 mW/m.K2 and thermoelectric figure of merit ZT of 0.15–0.23 at room temperature. However, ZT values were not improved at room temperature compared to prior works because of the rather large thermal conductivity of 3.75–4.5 W/m.K at room temperature. We find a larger resistivity, Seebeck coefficient, and power factor for the samples sintered at 200 °C for 5 min than for the samples sintered at 220 °C for 15 min, but similar thermal conductivity, resulting in larger ZT for the samples obtained in the first conditions. The samples with low Sb content x = 0.05 have a lower power factor and larger thermal conductivity than the samples with x = 0.12 and x = 0.15 for the same sintering conditions, which results in lower ZT for x = 0.05.

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Section: Transport and Thermoelectric Propertiessupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lattice Dynamics, Transport and Thermoelectric Properties of Bi-Sb Alloys Obtained by Mechanical Alloying and Spark Plasma Sintering

Viennois,

Alvarez,

Coulomb

et al. 2023

Metals

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show abstract

“…Typical methods used in previous studies relied mostly on the heat flow across the whole sample with multiple high thermal conductivity metal contact leads attached. Unsystematic variations of thermal conductivity data have been observed in measurements using PPMS, and previous studies by other groups relying on this type of measurement also reported a wide range of thermal conductivities 20,21,31,32 . This indicates there could be significant uncertainty associated with the thermal conductivity measurements due to radiative heat loss during the heating event or effects from metal contacts, especially for a low thermal conductivity system such as Bi-Sb.…”

Section: Fig 6 Energy Gap Obtained From the Two-band Effective Mass M...mentioning

confidence: 71%

Enhanced Figure of Merit in Bismuth-Antimony Fine-Grained Alloys at Cryogenic Temperatures

Gao

Gaskins

et al. 2019

Sci Rep

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Thermoelectric (TE) materials research plays a vital role in heat-to-electrical energy conversion and refrigeration applications. Bismuth-antimony (Bi-Sb) alloy is a promising material for thermoelectric cooling. Herein, a high figure of merit, ZT, near 0.6 at cryogenic temperatures (100–150 K) has been achieved in melt-spun n-type Bi85Sb15 bulk samples consisting of micron-size grains. The achieved ZT is nearly 50% higher than polycrystalline averaged single crystal ZT of ~0.4, and it is also significantly higher than ZT of less than ~0.3 measured below 150 K in Bi-Te alloys commonly used for cryogenic cooling applications. The improved thermoelectric properties can be attributed to the fine-grained microstructure achieved from rapid solidification, which not only significantly reduced the thermal conductivity but also mitigated a segregation effect. A record low thermal conductivity of ~1.5 W m−1 K−1 near 100 K was measured using the hot disk method. The thermoelectric properties for this intriguing semimetal-semiconductor alloy system were analyzed within a two-band effective mass model. The study revealed a gradual narrowing of the band gap at increasing temperature in Bi-Sb alloy for the first time. Magneto-thermoelectric effects of this Bi-Sb alloy further improved the TE properties, leading to ZT of about 0.7. The magneto-TE effect was further demonstrated in a combined NdFeB/BiSb/NdFeB system. The compactness of the BiSb-magnet system with high ZT enables the utilization of magneto-TE effect in thermoelectric cooling applications.

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Structural and Thermoelectric Properties of Bi85Sb15 Prepared by Non-equal Channel Angular Extrusion

El-Asfoury

Nasr

Nakamura

et al. 2017

Journal of Elec Materi

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Effect of Nano-ZrW2O8 on the Thermoelectric Properties of Bi85Sb15/ZrW2O8 Composites

Cited by 6 publications

References 14 publications

Lattice Dynamics, Transport and Thermoelectric Properties of Bi-Sb Alloys Obtained by Mechanical Alloying and Spark Plasma Sintering

Lattice Dynamics, Transport and Thermoelectric Properties of Bi-Sb Alloys Obtained by Mechanical Alloying and Spark Plasma Sintering

Enhanced Figure of Merit in Bismuth-Antimony Fine-Grained Alloys at Cryogenic Temperatures

Structural and Thermoelectric Properties of Bi85Sb15 Prepared by Non-equal Channel Angular Extrusion

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