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Effect of microstructure on the thermal conductivity of nanostructured Mg2(Si,Sn) thermoelectric alloys: An experimental and modeling approach
- Source :
- Acta Materialia, Acta Materialia, Elsevier, 2015, 95, pp.102-110. ⟨10.1016/j.actamat.2015.05.010⟩, Acta Materialia, 2015, 95, pp.102-110. ⟨10.1016/j.actamat.2015.05.010⟩
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- International audience; In this work, we produce bulk nanostructured Mg2Si0.4Sn0.6 thermoelectric materials made of nanograins with sizes below 200 nm and containing a fine distribution of Sn-rich nanoparticles. These materials are obtained by the mechanical alloying followed by spark plasma sintering. The microstructure and transport properties, and their evolutions upon aging, are investigated. A model is developed to capture the different contributions to the phonon scattering processes arising from the nano/microstructural parameters. The calculations show quantitative agreement with the temperature and the temporal dependence of the lattice thermal conductivity of the nanostructured Mg2Si0.4Sn0.6 alloy. This work provides a general analytic approach for identifying the individual contributions of the microstructural parameters on the thermal conductivity which is a very important property controlling the performance of thermoelectric materials.
- Subjects :
- Thermoelectrics
Materials science
Polymers and Plastics
Phonon scattering
Thermal conductivity reduction
Spark plasma sintering
Metallurgy
Alloy
Metals and Alloys
[CHIM.MATE]Chemical Sciences/Material chemistry
engineering.material
Thermoelectric materials
Microstructure
Magnesium silicides
Electronic, Optical and Magnetic Materials
Thermal conductivity
Nano
Thermoelectric effect
Ceramics and Composites
engineering
Composite material
Nanostructuration
Subjects
Details
- ISSN :
- 13596454
- Volume :
- 95
- Database :
- OpenAIRE
- Journal :
- Acta Materialia
- Accession number :
- edsair.doi.dedup.....aab3a1f8d2eb4ca725e6324e1e890f5e