Thermoelectric properties of silver-doped n-type Bi2Te3-based material prepared by mechanical alloying and subsequent hot pressing

Half-Heusler alloys are one of the potential thermoelectric materials for medium to high temperature range application. As a part of fundamental study to establish processing route and to observe thermoelectric properties in undoped state, ZrCoSb was selected, processed and evaluated. In an attempt to produce a half-Heusler thermoelectric materials having ultra fine grain structures, ZrCoSb was synthesized by mechanical alloying of stoichiometric elemental powder compositions, and consolidated by vacuum hot pressing. Phase transformations during mechanical alloying and hot consolidation were investigated using XRD, SEM and EDS. Single-phase, half-Heusler was successfully produced by vacuum hot pressing using as-milled powders without subsequent annealing. Thermoelectric properties as functions of temperature were evaluated in terms of Seebeek coefficient, electrical conductivity, thermal conductivity and the figure of merit for the hot pressed specimens. Mechanically alloyed half-Heusler phase, ZrCoSb, appeared to have a great potential as a thermoelectric materials in this study.

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Preparation and Thermoelectric Properties of Polycrystalline In4Sn3−x by Mechanical Alloying and Hot Pressing

Journal of Electronic Materials ◽

10.1007/s11664-012-1948-2 ◽

2012 ◽

Vol 41 (6) ◽

pp. 1077-1080 ◽

Cited By ~ 15

Author(s):

Jun-You Yang ◽

Jin Wu ◽

Gen Li ◽

Jian-Sheng Zhang ◽

Jiangying Peng

Keyword(s):

Mechanical Alloying ◽

Thermoelectric Properties ◽

Hot Pressing

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Electronic Transport and Thermoelectric Properties of Cu12-xZnxSb4S13 Tetrahedrites Prepared by Mechanical Alloying and Hot Pressing

Korean Journal of Metals and Materials ◽

10.3365/kjmm.2019.57.5.328 ◽

2019 ◽

Vol 57 (5) ◽

pp. 328-333 ◽

Cited By ~ 1

Author(s):

Sung-Gyu Kwak ◽

Go-Eun Lee ◽

Il-Ho Kim

Keyword(s):

Mechanical Alloying ◽

Thermoelectric Properties ◽

Electronic Transport ◽

Hot Pressing

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Thermoelectric Properties of N-Type Bi2(Tel−xSex)3 Fabricated by Mechanical Alloying and Hot Pressing

MRS Proceedings ◽

10.1557/proc-478-151 ◽

1997 ◽

Vol 478 ◽

Cited By ~ 1

Author(s):

Hee-Jeong Kim ◽

Jae-Shik Choi ◽

Tae-Sung Oh ◽

Dow-Bin Hyun

Keyword(s):

Mechanical Alloying ◽

Thermoelectric Properties ◽

Hot Pressing ◽

Figure Of Merit ◽

Processing Time ◽

Acceptor Dopant ◽

Maximum Value

AbstractThermoelectric properties of polycrystalline Bi2(Te1−xSex)3 (0.05 ≤ x ≤ 0.25), fabricated by mechanical alloying and hot pressing, have been investigated. Formation of n-type Bi2(Te0.9 Se0.1)3 alloy powders was completed by mechanical alloying for 3 hours at ball-to-material ratio of 5: 1, and processing time for Bi2(Te1−xSex)3 formation increased with Bi2Se3 content x. Figure-of-merit of Bi2(Te0.9Se0.1) was markedly increased by hot pressing at temperatures above 450°C, and maximum value of 1.9 × 10−3/K was obtained by hot pressing at 550°C. With addition of 0.015 wt% Bi as acceptor dopant, figure-of-merit of Bi2 (Te0.9Se0.1)3, hot pressed at 550°C, could be improved to 2.1 × 10−3/K. When Bi2(Te1−xSex)3 was hot pressed at 550°C, figure-of-merit increased from 1.14 × 103/K to 1.92 × 10−3/K with increasing Bi2Se3 content x from 0.05 to 0.15, and then decreased to 1.30 × 103/K for x = 0.25 composition.

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