Thermoelectric Properties of n-type Full-Heusler Fe2−2xCo2xTiSn Prepared by an Ultra-fast Synthesis Process
Dongyan ZhaoYanning ChenYubo WangHaifeng ZhangZhen FuShuaipeng WangWen YuJian W. DuWenhe WangJunhao QiuYonggao Yan
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Spark Plasma Sintering
Arc melting
Effect of applied pressure during reactive spark plasma sintering (RSPS) of undoped and Ni-doped CoSb3skutterudite samples on their thermoelectric and mechanical properties is reported. Undoped and Ni-doped CoSb3 samples (CoSb3, Ni0.1Co0.9Sb3 and Ni0.2Co0.8Sb3) were processed using ball milling followed by RSPS at two different applied pressures of 50 MPa and 80 MPa. Electrical conductivity and thermopower of the samples processed at 80 MPa are enhanced substantially than those processed at 50 MPa. As a result, the thermoelectric power factor at 773 K for Ni0.2Co0.8Sb3 processed at 50 MPa is increased from 2 mW/mK2 to 3.3 mW/mK2 processed at 80 MPa, the highest value of unfilled Ni-doped CoSb3skutterudites reported so far. Nanomechanical testing reveals the significant improvement of the Young's modulus and mechanical properties of the samples processed at 80 MPa. Our results show that the materials can be used in the thermoelectric device for waste heat recovery applications.
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Thermoelectric properties of (Bi,Sb)2Te3 nanostructured bulk material as a function of composition and spark plasma sintering temperature were investigated. The Bi0,4Sb1,6Te3 alloys at sintering temperature 450—500 °C with ZT=1,25—1,28 figure of merit was fabricated. Thermoelectric properties ad a function of sintering temperature above 400 °C correlate with fine structure change. It was found that point structure defects introduce essential contribution to the formation of nanostructured material thermoelectric properties.
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A new method for obtaining a nanostructured thermoelectric solid solution of silicon-germanium n-type using spark plasma sintering of powders is described. The novelty of the work lies in the use of a silicon phosphide compound as a doping source. Methods for measuring thermoelectric characteristics of the structures under study are described. The influence of the sintering rate on the final thermoelectric characteristics of the sintered material is revealed. The effect of high-temperature annealing on the thermoelectric properties of structures is discussed. It is shown that the described method of forming a thermoelectric material makes it possible to achieve the value of thermoelectric parameters comparable with world analogues.
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The p-type thermoelectric compounds of $Bi_2Te_3$ based doped with 3wt% Te were fabricated by a combination of rapid solidification and spark plasma sintering (SPS) process. The effect of holding time during spark plasma sintering (SPS) on the microstructure and thermoelectric properties were investigated using scanning electron microscope (SEM), X-ray diffraction (XRD) and thermoelectric properties. The powders as solidified consisted of homogeneous thermoelectric phases. The thermoelectric figure of merit measured to be maximum ($3.41{\times}10^{-3}/K$ ) at the SPS temperature of $430^{\circ}C$ .
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