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Phase stability and thermoelectric properties of Cu10.5Zn1.5Sb4S13 tetrahedrite
Duraiswamy Sivaprahasam, Manjusha Battabyal, Raghavan Gopalan
Published in Elsevier Ltd
2016
Volume: 667
   
Pages: 323 - 328
Abstract
Cu10.5Zn1.5Sb4S13 tetrahedrite compound was prepared by mechanical milling of Cu2S, ZnS and Sb2S3 powders and spark plasma sintered (SPS) to dense samples. The phase formation, chemical homogeneity, thermal stability of the compound and the thermoelectric properties of the sintered samples were evaluated. Single phase tetrahedrite with the crystallite size of 40 nm was obtained after 30 h of milling followed by annealing at 573 K for 6 h in an argon atmosphere. In-situ high-temperature X-ray diffraction studies revealed that the phase is stable up to 773 K. The Seebeck coefficient of the sintered samples of density >98% shows p-type behavior with maximum thermopower of 170 μV/K at 573 K. The electrical resistivity (ρ) decreases with temperature up to 475 K and then increases. A low thermal conductivity of 0.5 W/(m•K), in combination with moderate power factor gave a maximum ZT of ∼0.038 at 573 K in Cu10.5Zn1.5Sb4S13 sample having a grain size of ∼200 nm. © 2016 Elsevier B.V. All rights reserved.
About the journal
JournalData powered by TypesetJournal of Alloys and Compounds
PublisherData powered by TypesetElsevier Ltd
ISSN09258388
Open AccessNo
Concepts (24)
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    Chemical stability
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    Copper compounds
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    Crystallite size
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    Electric power factor
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    Mechanical alloying
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    Milling (machining)
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    Sintering
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    Solid state reactions
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    Spark plasma sintering
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    Thermal conductivity
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    Thermodynamic stability
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    Thermoelectric equipment
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    X ray diffraction
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    Zinc
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    Zinc sulfide
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    CHEMICAL HOMOGENEITY
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    Figure of merits
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    High temperature x-ray diffraction
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    Low thermal conductivity
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    MECHANICAL MILLING
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    TETRAHEDRITE
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    Thermoelectric
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    Thermoelectric properties
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    Antimony compounds