scholarly journals Structure and thermoelectric properties of single-phase isocubanite CuFe2S3 synthesized by mechanical-alloying and ultra-fast microwave radiation technique

2021 ◽  
Author(s):  
Tristan Barbier ◽  
Bhuvanesh Srinivasan ◽  
David Berthebaud ◽  
Volker Eyert ◽  
Raymond Frésard ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Microwave Radiation ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
Toxic Elements ◽  
Single Phase ◽  
State Of The Art ◽  
Current State ◽  
Radiation Technique

The current state-of-the-art thermoelectric materials are generally composed of expensive, scarce, and toxic elements. In this respect, copper-based sulfide compounds have emerged as viable alternatives. Herein, we report for the...

Synthesis and Thermoelectric Properties of Undoped Half-Heusler Zr-Co-Sb Alloy Processed by Mechanically Alloying and Hot Pressing

2011 ◽  
Vol 695 ◽  
pp. 69-72
Author(s):  
Il Ho Kim ◽  
Joon Chul Kwon ◽  
Young Geun Lee ◽  
Sung Lim Ryu ◽  
Man Soon Yoon ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
Hot Pressing ◽  
Heusler Alloys ◽  
Processing Route ◽  
Mechanically Alloyed ◽  
Fundamental Study ◽  
Vacuum Hot Pressing ◽  
Fine Grain

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.

Lanthanide Based Ternary Intermetallics as Advanced Thermoelectric Materials

2006 ◽  
Vol 980 ◽  
Author(s):  
Ken Kurosaki ◽  
Takeyuki Sekimoto ◽  
Kenta Kawano ◽  
Hiroaki Muta ◽  
Shinsuke Yamanaka
Keyword(s):  
Electrical Resistivity ◽  
Seebeck Coefficient ◽  
High Temperatures ◽  
Thermoelectric Properties ◽  
Power Factor ◽  
Thermoelectric Materials ◽  
Room Temperature ◽  
Single Phase ◽  
Type Structure ◽  
Large Power

AbstractPolycrystalline ingots of the lanthanide based ternary intermetallics: LaNiSb, GdNiSb, ErNiSb and ErPdSb were prepared and characterized. The thermoelectric properties of ErNiSb and ErPdSb were measured at high temperatures. We succeeded in preparing the single phase ingots of ErNiSb and ErPdSb, while the ingots of LaNiSb and GdNiSb contain appreciable quantities of the impurity phases. ErNiSb and ErPdSb crystallize the MgAgAs-type structure (half-Heusler structure). ErNiSb and ErPdSb indicate positive values of the Seebeck coefficient. The values at room temperature are 36 and 240 micro VK-1 for ErNiSb and ErPdSb, respectively. The electrical resistivity of ErNiSb and ErPdSb decreases with temperature, indicating semiconductor-like behavior. ErPdSb exhibits a relatively large power factor 1.5x10-3 Wm-1K-2 at around 700 K, which is approximately two times larger than that of ErNiSb.

Thermoelectric Properties of Nanostructured CoSb3 Synthesized by Mechanical Alloying

2007 ◽  
Vol 534-536 ◽  
pp. 1425-1428
Author(s):  
Soon Chul Ur ◽  
Joon Chul Kwon ◽  
Moon Kwan Choi ◽  
Soon Young Kweon ◽  
Tae Whan Hong ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Alloying ◽  
Thermoelectric Properties ◽  
Hot Pressing ◽  
Figure Of Merit ◽  
Single Phase ◽  
Phonon Scattering ◽  
Stoichiometric Composition ◽  
Processing Route ◽  
Vacuum Hot Pressing

Undoped CoSb3 powders were synthesized by mechanical alloying of elemental powders using a nominal stoichiometric composition. Nanostructured, single-phase skutterudite CoSb3 was successfully produced by vacuum hot pressing using as-milled powders without subsequent annealing. Phase transformations during synthesis were investigated using XRD, and microstructure was observed using SEM and TEM. Thermoelectric properties in terms of Seebeck coefficient, electrical conductivity, thermal conductivity and figure of merit were systematically measured and compared with the results of analogous studies. Lattice thermal conductivity was reduced owing to increasing phonon scattering in nanostructured CoSb3, leading to enhancement in the thermoelectric figure of merit. Mechanical Alloying associated with vacuum hot pressing technique offers an alternative potential processing route for the production of skutterudites.

Extremely Low Thermal Conductivity Substances as Novel Thermoelectric Materials

2005 ◽  
Vol 886 ◽  
Author(s):  
Shinsuke Yamanaka ◽  
Ken Kurosaki ◽  
Atsuko Kosuga ◽  
Keita Goto ◽  
Hiroaki Muta
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
Figure Of Merit ◽  
Room Temperature ◽  
State Of The Art ◽  
Thermoelectric Figure ◽  
Low Thermal Conductivity ◽  
Thallium Compounds ◽  
Thallium Tellurides

ABSTRACTWe have prepared polycrystalline bulk samples of various thallium compounds and measured their thermoelectric properties. The most remarkable point of the thermoelectric properties of the thallium compounds is the extremely low thermal conductivity. The state-of-the-art thermoelectric materials such as Bi2Te3 and TAGS materials indicate relatively low the thermal conductivity, around 1.5 W/m/K. However, the thermal conductivity of the thallium compounds is below 0.5 W/m/K; especially that of silver thallium tellurides is around 0.25 W/m/K at room temperature. This extremely low thermal conductivity leads a great advantage for an enhancement of the thermoelectric performance. In this paper, we report on the properties of some thallium compounds selected for study as novel thermoelectric materials. One of these compounds seems to have a thermoelectric figure of merit comparable to those of state-of-the-art materials.

Thermoelectric Properties of Manganese Monosilicide Synthesized by Mechanical Alloying Process

2012 ◽  
Vol 724 ◽  
pp. 111-114
Author(s):  
Moon Kwan Choi ◽  
Woong Jae Lee ◽  
Il Ho Kim ◽  
Young Geun Lee ◽  
Soon Yong Kweon ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Alloying ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Single Phase ◽  
High Temperature Application ◽  
Mechanically Alloyed ◽  
Fundamental Investigation ◽  
Manganese Silicide ◽  
Temperature Application

Manganese silicide is one of the potential thermoelectric materials for high temperature application. As a fundamental investigation on these materials group, manganese monosilicides were synthesized by the mechanical alloying of stoichiometric elemental powder compositions, and the as-milled powders were consolidate by vacuum hot pressing. Phase transformation and microstructure evolution during mechanical alloying and hot consolidation were investigated using XRD and SEM. Near single phase of monosilicides were successfully produced in this process. Thermoelectric properties as a function of temperature were evaluated in terms of Seebeek coefficient, electrical resistivity, thermal conductivity and the figure of merit for the hot pressed specimens. Mechanically alloyed manganese monosilicide, MnSi, appeared to have a potential as a thermoelectric material in this study.

Soft Organic Thermoelectric Materials: Principles, Current State of the Art and Applications

Small ◽  
2021 ◽  
pp. 2104922
Author(s):  
Yinhang Zhang ◽  
Wei Wang ◽  
Fei Zhang ◽  
Kun Dai ◽  
Chuanbing Li ◽  
...  
Keyword(s):  
Thermoelectric Materials ◽  
State Of The Art ◽  
Organic Thermoelectric Materials ◽  
Current State

Mechanical Alloying and Thermoelectric Properties of CoSb3 Skutterudite

2005 ◽  
Vol 486-487 ◽  
pp. 642-645 ◽  
Author(s):  
Moon Kwan Choi ◽  
Soon Chul Ur ◽  
Joon Chul Kwon ◽  
K.W. Cho ◽  
Il Ho Kim ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Mechanical Alloying ◽  
Phase Transformations ◽  
Thermoelectric Properties ◽  
Hot Pressing ◽  
Single Phase ◽  
Stoichiometric Composition ◽  
Subsequent Annealing ◽  
Vacuum Hot Pressing ◽  
Temperature Dependences

In an effort to synthesize homogenized single phase d-CoSb3, this study considers the mechanical alloying (MA) of elemental Co and Sb powders using a nominal stoichiometric composition followed by hot pressing. Single phase, undoped CoSb3 skutterudites were successfully produced by vacuum hot pressing using MA powders without subsequent annealing. Phase transformations during mechanical alloying, powder annealing, and hot pressing were systematically investigated using XRD and SEM. Thermoelectric properties were measured and compared with the results of similar studies. Temperature dependences were also evaluated, and their correlations to phase transformation were examined.

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