Promising thermoelectric properties in AgxMo9Se11 compounds (3.4 ≤ x ≤ 3.9)
Résumé
Polycrystalline Mo9 cluster chalcogenides AgxMo9Se11 (3.4 ≤ x ≤ 3.9) have been prepared by powder metallurgy techniques, sintered by spark plasma sintering and characterized by x-ray diffraction. Their thermoelectric properties (electrical resistivity, thermopower, thermal conductivity) have been determined in the 300-800 K temperature range. The AgxMo9Se11 compounds show p-type conduction characteristics. The outstanding low lattice thermal conductivities give rise to a rather high value of the dimensionless thermoelectric figure of merit ZT of ∼ 0.65 at 800 K for x = 3.8-3.9, making this family of materials particularly promising for thermoelectric power generation applications.
Mots clés
Electrical resistivity
Molybdenum alloys
Plasma materials processing
Powder metallurgy
Selenium alloys
Silver alloys
Sintering
Thermal conductivity
Thermoelectric power
X-ray diffraction
Thermoelectric effects
Polycrystalline material
Thermodynamic properties
Differential scanning calorimetry
Metallurgy
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