Transport and thermoelectric properties of Nb-doped FeV0.64Hf0.16Ti0.2Sb half-Heusler alloys synthesized by two ball milling regimes

Heusler-type Fe2VxTi 1-xAl alloys offer an alternative solution for the generation of thermoelectric power near room temperature. In the current research, thermoelectric properties of the p-type Fe2V0.9Ti0.1Al and Fe2V0.9Ti0.1Al/CNTs alloys, prepared by SPS, were studied. Carbon nanotubes (CNTs) were used as dopants to improve the Seebeck coefficient and electrical conductivity. Upon doping with CNTs, the thermal conductivity was significantly reduced, meanwhile, the value of the power factor increased from 0.45 to 1.55 mW/mK2 at around 330K. The effect of CNT inclusions on the thermoelectric parameters of Fe2VxTi 1-xAl compounds was systematically studied. When compared to Fe2V0.9Ti0.1Al, which had a figure of merit of just 0.02 at 330 K, the CNT-containing samples showed a significantly improved figure of merit up to 0.07. we offer a novel technique to improve the performance of Fe2VAl alloys.

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“…4). Clearly, doping and alloying is quite effective strategy for enhancing the materials thermoelectric performance [29][30][31].…”

Section: Thermoelectric Parametersmentioning

confidence: 99%

Thermoelectric performance of Fe2ALV/CNT-based alloys

et al. 2023

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Section: Introductionmentioning

confidence: 99%

“…Over the last few decades, Half-Heusler (HH) alloys have been drawing much attention of the material science community worldwide, both experimental and theoretical, for their potential utilities in sustainable energy related applications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] . They are among the most promising thermoelectric materials that can be used at medium to high temperature power generation purposes 9 . Additionally, the excellent mechanical and thermal stability and low toxicity of these compounds make them suitable for industrial and commercial usage in the field of environment friendly clean energy production 9,10 .…”

Section: Introductionmentioning

confidence: 99%

“…They are among the most promising thermoelectric materials that can be used at medium to high temperature power generation purposes 9 . Additionally, the excellent mechanical and thermal stability and low toxicity of these compounds make them suitable for industrial and commercial usage in the field of environment friendly clean energy production 9,10 .…”

Section: Introductionmentioning

confidence: 99%

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Combined Experimental and First Principles Study on Nanostructured NbFeSb Half-Heusler Alloy Synthesized by Mechanical Alloying

et al. 2023

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The Half-Heusler semiconductor alloys can be used efficiently as thermoelectric materials to transform the waste heat into useful electrical energy. The low-cost and large-scale production of suitable half-Heusler alloys are important in the present context. In this work, a nanostructured half-Heusler NbFeSb alloy is obtained by mechanical alloying with 15h of milling. The structural parameters of the sample are investigated by powder X-ray diffraction followed by Rietveld refinement. Differential scanning calorimetry indicates that the NbFeSb phase is stable up to about 420 K. The electrical resistivity is obtained as a function of temperature. A band gap of 0.37(3) eV is obtained from UV-Vis measurements. Density functional theory calculation shows an indirect band gap of 0.52 eV. Analyses of the obtained data indicate that structural defects and nanometric crystallites sizes present in the nanostructured NbFeSb produced by mechanical alloying do not degrade the electrical and optical properties of the compound.

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“…As reported, devices based on thermoelectric technology can work in reverse mode as a heat pump to produce cooling (refrigeration) with the many advantages including high reliability, small size and no noise, as well. By these measures of performance, thermoelectric technology is highly competitive [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Structure, thermal and physic-chemical properties of some chalcogenide alloys

et al. 2023

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Bulk products of crystalline Bi2Se3-xTex alloys (x =0.0, 0.1, 0.3, 0.5) were prepared using simple melting synthesis. Crystalline features, microstructure and surface morphologies of the synthesized samples were examined via x-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive x-ray spectrometer. Elemental distribution was studied by energy dispersive analysis of X-ray (EDAX) spectroscopy. Polycrystalline of rhombohedral crystal structure was observed for the concerned samples. Perfect crystallinity and micro-scalability of the prepared were also reflected by the physic-chemical properties of each sample. Thermal behavior was studied throughout differential scanning calorimetry and thermogravimetric analysis showing that the samples are of high stability over high temperature range. Physic-chemical properties were determined in terms of experimental density. These properties were compactness value, molar volume and the percentage of free volume. Density of Bi2Se3 alloy was obtained at 7.37 gm/cm3. Te doping enhanced the density of the Bi2Se3-xTex system. The most Te doped alloy showed density of 9.018 gm/cm3. All other physic-chemical properties showed strong dependence on the Tea amounts in the system.

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Transport and thermoelectric properties of Nb-doped FeV0.64Hf0.16Ti0.2Sb half-Heusler alloys synthesized by two ball milling regimes

Cited by 23 publications

References 20 publications

Thermoelectric performance of Fe2ALV/CNT-based alloys

Thermoelectric performance of Fe2ALV/CNT-based alloys

Combined Experimental and First Principles Study on Nanostructured NbFeSb Half-Heusler Alloy Synthesized by Mechanical Alloying

Structure, thermal and physic-chemical properties of some chalcogenide alloys

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