Consolidation and thermoelectric properties of n-type bismuth telluride based materials by mechanical alloying and hot pressing

Yang, Junyou; Fan, Xiaoliang; Chen, R.G.; Zhu, Wen; Bao, Siqian; Duan, Xingkai

doi:10.1016/j.jallcom.2005.08.054

Cited by 54 publications

(35 citation statements)

References 11 publications

(10 reference statements)

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“…The total thermal conductivity decreases lightly from 1.013 to 0.890 W m −1 K −1 when increasing excess Te amount up to 4 wt.%, and then fluctuates near 0.900 W m −1 K −1 when further increasing excess Te content up to 8 wt.%. As we know, thermal conductivity of semiconductor can be approximately expressed as [17]:…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

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

Fan

Yang

Zhu

et al. 2008

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

“…The carrier-related thermal conductivity κ el can be calculated from the electrical resistivity (ρ) according to the Wiedemann-Franz law [17]:…”

Section: Resultsmentioning

confidence: 99%

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

Fan

Yang

Zhu

et al. 2008

Journal of Alloys and Compounds

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“…Copyright 2008, American Association for the Advancement of Science. n-Type Bi2Te3−xSex NC materials can also be fabricated with similar techniques such as ball-milling and hot pressing [65][66][67][68][69][70]. Figure 4 shows the TE properties of n-type Bi2Te3−xSex NC prepared in the same way as p-type NCs [65].…”

Section: Bismuth Telluride Based Nanocompositesmentioning

confidence: 99%

Thermoelectric Transport in Nanocomposites

Yang¹,

Chen²

2006

SAE Technical Paper Series

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Thermoelectric materials which can convert energies directly between heat and electricity are used for solid state cooling and power generation. There is a big challenge to improve the efficiency of energy conversion which can be characterized by the figure of merit (ZT). In the past two decades, the introduction of nanostructures into bulk materials was believed to possibly enhance ZT. Nanocomposites is one kind of nanostructured material system which includes nanoconstituents in a matrix material or is a mixture of different nanoconstituents. Recently, nanocomposites have been theoretically proposed and experimentally synthesized to be high efficiency thermoelectric materials by reducing the lattice thermal conductivity due to phonon-interface scattering and enhancing the electronic performance due to manipulation of electron scattering and band structures. In this review, we summarize the latest progress in both theoretical and experimental works in the field of nanocomposite thermoelectric materials. In particular, we present various models of both phonon transport and electron transport in various nanocomposites established in the last few years. The phonon-interface scattering, low-energy electrical carrier filtering effect, and miniband formation, etc., in nanocomposites are discussed.

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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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Consolidation and thermoelectric properties of n-type bismuth telluride based materials by mechanical alloying and hot pressing

Cited by 54 publications

References 11 publications

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

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

Thermoelectric Transport in Nanocomposites

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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