Enhanced TE performance of FeVSb1-xSnx half-heusler matrices using zirconia vial
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Thermoelectric and transport properties of FeVSb1-xSnx (0.015<x<0.055) alloys were studied with respect to types of vials(zirconia and stainless steel), Sn contents and temperature. The results were compared with the previously studied samplessynthesized by using stainless-vial. All the designated compositions in current work were prepared via a mechanical alloyingprocess using a zirconia vial. Vacuum hot pressing was conducted to consolidate the mechanically alloyed powders. F43msymmetry was being confirmed from the Rietveld refinement pattern. The phase transitions during the milling process andvacuum hot processing were investigated and the results exhibited near single half-Heusler phases with a minor portion of thesecond phase within the matrix. The Second phase might play a role to reduce thermal conductivity. Electrical conductivityexhibited semi-metallic behavior in all the temperature range. Carrier concentrations are found to be decreased with theincreasing Sn contents and the FeVSb0.955Sn0.045 specimen showed the ZTmax of 0.23 at 757 K.
Abstract
Thermoelectric and transport properties of FeVSb1-xSnx (0.015<x<0.055) alloys were studied with respect to types of vials(zirconia and stainless steel), Sn contents and temperature. The results were compared with the previously studied samplessynthesized by using stainless-vial. All the designated compositions in current work were prepared via a mechanical alloyingprocess using a zirconia vial. Vacuum hot pressing was conducted to consolidate the mechanically alloyed powders. F43msymmetry was being confirmed from the Rietveld refinement pattern. The phase transitions during the milling process andvacuum hot processing were investigated and the results exhibited near single half-Heusler phases with a minor portion of thesecond phase within the matrix. The Second phase might play a role to reduce thermal conductivity. Electrical conductivityexhibited semi-metallic behavior in all the temperature range. Carrier concentrations are found to be decreased with theincreasing Sn contents and the FeVSb0.955Sn0.045 specimen showed the ZTmax of 0.23 at 757 K.
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