Improving the Seebeck Coefficient and Electrical Conductivity of Fe₁₁Ti₃Al₆ by Substituting Fe with Cr.

IF 2.2 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Journal of Electronic Materials Pub Date : 2025-01-01 Epub Date: 2025-01-10 DOI:10.1007/s11664-024-11723-4

Sukhwinder Singh, Joseph Alemzadeh, Guillermo Menendez Rodriguez, Matthew Phillips, Daniel Zabek, Matthew Burton, Victoria G Rocha, Gao Min

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Abstract

In general, any attempt to increase the Seebeck coefficient is usually accompanied by a decrease in the electrical conductivity or vice versa due to the interplay between these two parameters. This work demonstrates that a simultaneous increase in both the Seebeck coefficient and electrical conductivity can be obtained by "doping" in intermetallic alloys. A new alloy composition, Fe₁₀Cr₁Ti₃Al₆, was synthesized by substituting Fe with Cr in Fe₁₁Ti₃Al₆ using mechanical alloying and spark plasma sintering (SPS). The thermoelectric measurements revealed that the Cr substitution led to an increase in the Seebeck coefficient from +27 µV/K in Fe₁₁Ti₃Al₆ to +39 µV/K in Fe₁₀Cr₁Ti₃Al₆, with a corresponding increase in the electrical conductivity from 2.5 × 10⁵ S/m to 4.7 × 10⁵ S/m, resulting in a significant increase in the power factor. The temperature dependence of the thermoelectric properties of this new alloy was also investigated over a temperature range of 50-727°C. The result showed that a maximum power factor of 6.0 × 10^-4 W/m K² was obtained at 53°C.

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来源期刊

Journal of Electronic Materials 工程技术-材料科学：综合

CiteScore

4.10

自引率

4.80%

发文量

693

审稿时长

3.8 months

期刊介绍： The Journal of Electronic Materials (JEM) reports monthly on the science and technology of electronic materials, while examining new applications for semiconductors, magnetic alloys, dielectrics, nanoscale materials, and photonic materials. The journal welcomes articles on methods for preparing and evaluating the chemical, physical, electronic, and optical properties of these materials. Specific areas of interest are materials for state-of-the-art transistors, nanotechnology, electronic packaging, detectors, emitters, metallization, superconductivity, and energy applications. Review papers on current topics enable individuals in the field of electronics to keep abreast of activities in areas peripheral to their own. JEM also selects papers from conferences such as the Electronic Materials Conference, the U.S. Workshop on the Physics and Chemistry of II-VI Materials, and the International Conference on Thermoelectrics. It benefits both specialists and non-specialists in the electronic materials field. A journal of The Minerals, Metals & Materials Society.