Thermoelectric Properties of the Heavy Element Doped Heusler Fe2VAl Alloy Prepared by Powder Metallurgy Technique

Mikami Masashi; Keizo Kobayashi; Suguru Tanaka

doi:10.4028/www.scientific.net/AST.74.32

Paper Titles

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Effect of Cobalt-Substitution on the Structure and Thermoelectric Properties of Chimney-Ladder Solid Solution (Mn_1-xCo_x)Si_γ (γ~ 1.7)
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Effect of Strontium and Europium Substitutions on Thermoelectric Properties in Silicon-Based Clathrate Compounds
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Thermoelectric Properties of the Heavy Element Doped Heusler Fe₂VAl Alloy Prepared by Powder Metallurgy Technique
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The Evaluation of TiTe₂ as a Diffusion Barrier in the Formation of Low Thermal Conductivity Nanolaminates with Bi₂Te₃ and Sb₂Te₃
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Structural Characterization of Nano-Crystalline Mg₂Si Prepared by Ball Milling
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High-Temperature Transport Properties of Indium Added Cobalt-Antimonide Based Skutterudites Processed by Current Assisted Short-Term Sintering
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Raman Spectroscopy Study on Na_2/3Mn_1-xFe_xO₂ Oxides
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Thermoelectric Properties of the Heavy Element Doped Heusler Fe₂VAl Alloy Prepared by Powder Metallurgy Technique

Abstract:

Sb-doped Heusler Fe2VAl alloy was synthesized to evaluate the effect of heavy element doping on thermoelectric properties of the Heusler alloy. For the sample preparation, a pulse-current sintering technique with fine powder prepared by mechanical alloying was used. By using the powder metallurgy technique, a heavy element with a low melting point can be stably doped, compared to the melting process. Thermal conductivity was effectively-reduced by a small amount of the substitution because of the large atomic mass of Sb compared to the constituent elements of Fe2VAl alloy. Conduction type was controlled by adjusting the valence electron density. For the p-type conduction, Ti substitution for the V site was examined and large positive Seebeck coefficient was obtained while maintaining the low thermal conductivity.