Thermoelectric properties of p-type Te-doped (Bi,Sb)2Te3 alloys by mechanical alloying and plasma activated sintering

Fan, Xiaoliang; Yang, Junyou; Zhu, Wen; Bao, Siqian; Duan, Xingkai; Zhang, Qinqin

doi:10.1016/j.jallcom.2006.10.062

Cited by 23 publications

(19 citation statements)

References 21 publications

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“…The trends are broadly in agreement with the literature on p-type bismuth telluride based materials produced using SPS and reinforced with nano-scale phases [7,12,14,16,[20][21][22][23]. The data in Figure 4 show generally lower Seebeck coefficient and electrical resistivity than some of the reports in the literature, but the overall performance, indicated by the zT values in Figure 5, are similar.…”

Section: Thermoelectric Propertiessupporting

confidence: 87%

“…Strength is also governed by flaws [10] in common with any brittle solid. Mechanical property improvement has been the justification for the development of polycrystalline materials produced by a variety of processes including hot-pressing [11,12], extrusion [8,13], plasma activated sintering [14,15] and spark plasma sintering (SPS) [7,[16][17][18][19][20][21][22][23][24]. The addition of nanoscale particulate reinforcements (SiC [17,18,23], C 60 [7], multi-wall carbon nanotubes [12] and Al 2 O 3 [22]) have been pursued.…”

Section: Introductionmentioning

confidence: 99%

“…The single-edge V-notched beam (SEVNB) fracture toughness test method was selected in preference to the indentation fracture toughness method, since the latter has been found to be unreliable [26]. [14] 113 HV0.01 100 HV0.025 [14] 56 -65 HV [8] 45 -64 HV [19] 55 -57 HV [24] 63 HV0.5 [18] 83 HV1 [23] 74 -80 HV0.5 [18] 87 HV1 [23] Flexural strength…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spark plasma sintered bismuth telluride-based thermoelectric materials incorporating dispersed boron carbide

Williams

Ambrosi

Chen

et al. 2015

Journal of Alloys and Compounds

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The mechanical properties of bismuth telluride based thermoelectric materials have received much less attention in the literature than their thermoelectric properties. Polycrystalline p-type Bi 0.5 Sb 1.5 Te 3 materials were produced from powder using Spark Plasma Sintering (SPS). The effects of nano-B 4 C addition on the thermoelectric performance, Vickers hardness and fracture toughness were measured. Addition of 0.2 vol% B 4 C was found to have little effect on zT but increased hardness by approximately 27% when compared to polycrystalline material without B 4 C. The K IC fracture toughness of these compositions was measured as 0.80 MPa m 1/2 by Single-Edge V-Notched Beam (SEVNB). The machinability of polycrystalline materials produced by SPS was significantly better than commercially available directionally solidified materials because the latter is limited by cleavage along the crystallographic plane parallel to the direction of solidification.

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Section: Thermoelectric Propertiessupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spark plasma sintered bismuth telluride-based thermoelectric materials incorporating dispersed boron carbide

Williams

Ambrosi

Chen

et al. 2015

Journal of Alloys and Compounds

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“…A constant relaxation time was used for the calculations to match the result with the experimental electrical resistivity of the Bi0.5Sb1.5Te3 at carrier concentration of 2 × 10 21 cm −3 . The lattice thermal conductivity was also taken from the experimental value of Bi0.4Sb1.6Te3 [38].…”

Section: Thermoelectric Materials Simulationmentioning

confidence: 99%

Material Optimization for a High Power Thermoelectric Generator in Wearable Applications

et al. 2017

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Thermoelectric power generation using human body heat can be applied to wearable sensors, and various applications are possible. Because the thermoelectric generator (TEG) is highly dependent on the thermoelectric material, research on improving the performance of the thermoelectric material has been conducted. Thus far, in developing thermoelectric materials, the researchers have focused on improving the figure of merit, ZT. For a TEG placed on the human body, however, the power density does not always increase as the material ZT increases. In this study, the material properties and ZT of P-type BiSbTe 3 were simulated for carrier concentration ranging from 3 × 10 17 to 3 × 10 20 cm −3 , and the power density of a TEG fabricated from the material dataset was calculated using a thermoelectric resistance model for human body application. The results revealed that the maximum ZT and the maximum power density were formed at different carrier concentrations. The material with maximum ZT showed 28.8% lower power density compared to the maximum obtainable power density. Further analysis confirmed that the mismatch in the optimum carrier concentration for the maximum ZT and maximum power density can be minimized when a material with lower thermal conductivity is used in a TEG. This study shows that the ZT enhancement of materials is not the highest priority in the production of a TEG for human body application, and material engineering to lower the thermal conductivity is required to reduce the optimum point mismatch problem.

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“…Poudel et al 10 showed that a peak ZT value of 1.4 was obtained at 100°C for the p-type nanocrystalline Bi-Sb-Te bulk alloys prepared by mechanical alloying (MA) and hot pressing (HP). In our previous works, the Bi 2 Te 3 -based TE materials were prepared by MA-HP, 11,12 MA-plasma-activated sintering (PAS) 13 or MA-equal channel angular extrusion 14 processes, and maximum ZT values obtained near room temperature were 0.66 15 and 1.5 16 for n-type and p-type materials, respectively.…”

Section: Introductionmentioning

confidence: 99%

Lattice Thermal Conductivity Reduction Due to In Situ-Generated Nano-Phase in Bi0.4Sb1.6Te3 Alloys by Microwave-Activated Hot Pressing

Yang

Fan

Rong

et al. 2014

Journal of Elec Materi

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The p-type Bi 0.4 Sb 1.6 Te 3 alloys are prepared using a new method of mechanical alloying followed by microwave-activated hot pressing (MAHP). The effect of sintering temperature on the microstructure and thermoelectric properties of Bi 0.4 Sb 1.6 Te 3 alloys is investigated. Compared with other sintering techniques, the MAHP process can be used to produce relatively compact bulk materials at lower sintering temperatures owing to its unique sintering mechanism. The grain size of the MAHP specimens increases gradually with the sintering temperature and a partially oriented lamellar structure can be formed in some regions of specimens obtained. The formation of the in situgenerated nano-phase is induced by the arcing effect of the MAHP process, which enhances the phonon scattering effect and decreases the lattice thermal conductivity. A minimum lattice thermal conductivity of 0.41 W/(mAEK) and a maximum figure of merit value of 1.04 are obtained at 100°C for the MAHP specimen sintered at 325°C. This technique may also be extended to other functional materials to obtain ultrafine microstructures at low sintering temperatures.

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Thermoelectric properties of p-type Te-doped (Bi,Sb)2Te3 alloys by mechanical alloying and plasma activated sintering

Cited by 23 publications

References 21 publications

Spark plasma sintered bismuth telluride-based thermoelectric materials incorporating dispersed boron carbide

Spark plasma sintered bismuth telluride-based thermoelectric materials incorporating dispersed boron carbide

Material Optimization for a High Power Thermoelectric Generator in Wearable Applications

Lattice Thermal Conductivity Reduction Due to In Situ-Generated Nano-Phase in Bi0.4Sb1.6Te3 Alloys by Microwave-Activated Hot Pressing

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