Heat capacity of the n-Bi2Te2.88Se0.12 and p-Bi0.52Sb1.48Te3 solid solutions

Shtern, Yu. I.; Malkova, A. S.; Pashinkin, A. S.; Федоров, В. А.

doi:10.1134/s0020168508100051

Cited by 15 publications

(10 citation statements)

References 1 publication

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“…The thermal conductivity was calculated based on κ = DC p d where D is the thermal diffusivity, C p is the heat capacity, and d is the density. The temperature dependent heat capacity of Bi 2 Te 3 reported by Shtern et al was used . The density was measured using the Archimedes method.…”

Section: Methodsmentioning

confidence: 99%

The Thermoelectric Properties of Bismuth Telluride

Witting

Chasapis

Ricci

et al. 2019

Adv Elect Materials

587

406

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Bismuth telluride is the working material for most Peltier cooling devices and thermoelectric generators. This is because Bi2Te3 (or more precisely its alloys with Sb2Te3 for p‐type and Bi2Se3 for n‐type material) has the highest thermoelectric figure of merit, zT, of any material around room temperature. Since thermoelectric technology will be greatly enhanced by improving Bi2Te3 or finding a superior material, this review aims to identify and quantify the key material properties that make Bi2Te3 such a good thermoelectric. The large zT can be traced to the high band degeneracy, low effective mass, high carrier mobility, and relatively low lattice thermal conductivity, which all contribute to its remarkably high thermoelectric quality factor. Using literature data augmented with newer results, these material parameters are quantified, giving clear insight into the tailoring of the electronic band structure of Bi2Te3 by alloying, or reducing thermal conductivity by nanostructuring. For example, this analysis clearly shows that the minority carrier excitation across the small bandgap significantly limits the thermoelectric performance of Bi2Te3, even at room temperature, showing that larger bandgap alloys are needed for higher temperature operation. Such effective material parameters can also be used for benchmarking future improvements in Bi2Te3 or new replacement materials.

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Section: Methodsmentioning

confidence: 99%

The Thermoelectric Properties of Bismuth Telluride

Witting

Chasapis

Ricci

et al. 2019

Adv Elect Materials

587

406

View full text Add to dashboard Cite

show abstract

“…Some of the existing information of the specific heat taken from Refs. [19][20][21][22][23] are listed in Table 2. It can be found that the specific heat of the major thermoelectric materials is within 154-210 J kg À1 K À1 and according to the existing data, no appreciable difference between the P-type and N-type materials is found.…”

Section: Parametermentioning

confidence: 99%

“…On the other hand, the parameters are determined either according to direct measurement or from the existing information [8,15,[18][19][20][21][22][23]. Table 1 displayed the fixed parameters with all the cases in computation.…”

Section: Parametermentioning

confidence: 99%

A three-dimensional theoretical model for predicting transient thermal behavior of thermoelectric coolers

Cheng

Huang

Cheng

2010

International Journal of Heat and Mass Transfer

103

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“…The thermal conductivity was calculated from the equation κ = aC p d ( a : thermal diffusivity, C p : specific heat capacity, d : sample density). The thermal diffusivity was experimentally measured by the laser flash method (LFA-447, Netzsch), while the specific heat capacity was theoretically obtained according to computations of the C p values for Bi 2 Te 3 and Sb 2 Te 3 . Densities were calculated based on the specimen geometry, and all samples exhibited values in the range of 95.1 ± 1.3% of the theoretical density.…”

Section: Methodsmentioning

confidence: 99%

“…The thermal diffusivity was experimentally measured by the laser flash method (LFA-447, Netzsch), while the specific heat capacity was theoretically obtained according to computations of the C p values for Bi 2 Te 3 and Sb 2 Te 3 . 12 Densities were calculated based on the specimen geometry, and all samples exhibited values in the range of 95.1 ± 1.3% of the theoretical density. Carrier concentration and mobility were measured by a Hall effect measurement system (HMS-3000, Ecopia) equipped with a 0.55 T electromagnet.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Method of Efficient Ag Doping for Fermi Level Tuning of Thermoelectric Bi_0.5Sb_1.5Te₃ Alloys Using a Chemical Displacement Reaction

et al. 2015

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Silver is a well-known element for use as a p-type dopant in Bi 2 Te 3 -related compounds. In this paper, an efficient method for incorporating ultra-low Ag dopant concentrations (< 1,300 ppm) into Bi 0.5 Sb 1.5 Te 3 via a simple chemical displacement reaction is described. Powders of Bi 0.5 Sb 1.5 Te 3 synthesized by mechanical alloying were reacted with Ag + ions in dilute HNO 3 solutions (pH 0.2), resulting in the deposition of Ag on the surface of the powders due to the difference in reduction potential between Ag and Bi 0.5 Sb 1.5 Te 3 . The Ag/Bi 0.5 Sb 1.5 Te 3 powders were then sintered by SPS, and the thermoelectric properties of the dense Ag-doped samples were measured. Low Ag-doped samples showed behavior characteristic of partially degenerate semiconductors, while highly-doped specimens exhibited properties associated with fully degenerate semiconductors. From the measured transport properties and theoretical estimations, successful tuning of the Fermi level with Ag was confirmed. Consequently, the temperature at which the peak dimensionless figure of merit (ZT) value was obtained increased from 50 °C to 250 °C. Such findings may be beneficial in the utilization of waste heat over a wide temperature range, as the Ag-doped samples could be employed as functionally graded materials for thermoelectric modules.

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Heat capacity of the n-Bi2Te2.88Se0.12 and p-Bi0.52Sb1.48Te3 solid solutions

Cited by 15 publications

References 1 publication

The Thermoelectric Properties of Bismuth Telluride

The Thermoelectric Properties of Bismuth Telluride

A three-dimensional theoretical model for predicting transient thermal behavior of thermoelectric coolers

Method of Efficient Ag Doping for Fermi Level Tuning of Thermoelectric Bi_0.5Sb_1.5Te₃ Alloys Using a Chemical Displacement Reaction

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Heat capacity of the n-Bi2Te2.88Se0.12 and p-Bi0.52Sb1.48Te3 solid solutions

Cited by 15 publications

References 1 publication

The Thermoelectric Properties of Bismuth Telluride

The Thermoelectric Properties of Bismuth Telluride

A three-dimensional theoretical model for predicting transient thermal behavior of thermoelectric coolers

Method of Efficient Ag Doping for Fermi Level Tuning of Thermoelectric Bi0.5Sb1.5Te3 Alloys Using a Chemical Displacement Reaction

Contact Info

Product

Resources

About

Method of Efficient Ag Doping for Fermi Level Tuning of Thermoelectric Bi_0.5Sb_1.5Te₃ Alloys Using a Chemical Displacement Reaction