Magnetic and Thermoelectric Properties of Fe<sub>2</sub>CoGa Heusler Compounds
The investigation of the properties of Heusler compounds is an important task that will pave the way for new applications in various fields related to magnetics and thermoelectrics. This study examines the magnetic and thermoelectric properties of Fe<sub>2</sub>CoGa Heusler compounds pre...
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2025-01-01
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| author | Tetsuji Saito Hayai Watanabe |
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| description | The investigation of the properties of Heusler compounds is an important task that will pave the way for new applications in various fields related to magnetics and thermoelectrics. This study examines the magnetic and thermoelectric properties of Fe<sub>2</sub>CoGa Heusler compounds prepared by casting and subsequent annealing. The Fe<sub>2</sub>CoGa Heusler compound was found to be ferromagnetic, with a large saturation magnetization of 110 emu/g and a high Curie temperature of 1011 K. The Fe<sub>2</sub>CoGa Heusler compound was a good thermoelectric material, with a negative Seebeck coefficient of −44 μV/K, a low electrical resistivity of 0.60 μΩm, and a high-power factor of 3000 μW/mK<sup>2</sup> at room temperature. The maximum power factor of 3230 μW/mK<sup>2</sup> for the Fe<sub>2</sub>CoGa Heusler compound was obtained at 400 K. In order to improve the magnetic and thermoelectric properties of the Fe<sub>2</sub>CoGa Heusler compound, Fe<sub>2-x</sub>Co<sub>1+x</sub>Ga (x = 0–1) Heusler compounds were also prepared by casting and subsequent annealing. In the Fe<sub>2-x</sub>Co<sub>1+x</sub>Ga (x = 0–1) Heusler compounds, the saturation magnetization slightly decreased, but the Curie temperature increased with increasing Co content (x). As regards the thermoelectric properties, the electrical resistivity of the Fe<sub>2-x</sub>Co<sub>1+x</sub>Ga (x = 0.25–1) Heusler compounds was smaller than that of the Fe<sub>2</sub>CoGa Heusler compound. The Seebeck coefficient and power factor of the Fe<sub>1.75</sub>Co<sub>1.25</sub>Ga Heusler compound were more significant than those of the Fe<sub>2</sub>CoGa Heusler compound. An increase in the Co content of the Fe<sub>2</sub>CoGa Heusler compound did not improve the saturation magnetization but improved the Curie temperature and thermoelectric properties of the Fe<sub>2</sub>CoGa Heusler compound. The Fe<sub>1.75</sub>Co<sub>1.25</sub>Ga Heusler compound exhibited a high-power factor value of over 4000 μW/mK<sup>2</sup>, which was comparable to that of the Bi<sub>2</sub>Te<sub>3</sub> compound. |
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| spelling | doaj-art-7c6c868ff4a74b4c83e4c2aaa44894e72025-08-20T02:44:56ZengMDPI AGInorganics2304-67402025-01-011323310.3390/inorganics13020033Magnetic and Thermoelectric Properties of Fe<sub>2</sub>CoGa Heusler CompoundsTetsuji Saito0Hayai Watanabe1Graduate School of Engineering, Chiba Institute of Technology, Narashino 275-8588, Chiba, JapanGraduate School of Engineering, Chiba Institute of Technology, Narashino 275-8588, Chiba, JapanThe investigation of the properties of Heusler compounds is an important task that will pave the way for new applications in various fields related to magnetics and thermoelectrics. This study examines the magnetic and thermoelectric properties of Fe<sub>2</sub>CoGa Heusler compounds prepared by casting and subsequent annealing. The Fe<sub>2</sub>CoGa Heusler compound was found to be ferromagnetic, with a large saturation magnetization of 110 emu/g and a high Curie temperature of 1011 K. The Fe<sub>2</sub>CoGa Heusler compound was a good thermoelectric material, with a negative Seebeck coefficient of −44 μV/K, a low electrical resistivity of 0.60 μΩm, and a high-power factor of 3000 μW/mK<sup>2</sup> at room temperature. The maximum power factor of 3230 μW/mK<sup>2</sup> for the Fe<sub>2</sub>CoGa Heusler compound was obtained at 400 K. In order to improve the magnetic and thermoelectric properties of the Fe<sub>2</sub>CoGa Heusler compound, Fe<sub>2-x</sub>Co<sub>1+x</sub>Ga (x = 0–1) Heusler compounds were also prepared by casting and subsequent annealing. In the Fe<sub>2-x</sub>Co<sub>1+x</sub>Ga (x = 0–1) Heusler compounds, the saturation magnetization slightly decreased, but the Curie temperature increased with increasing Co content (x). As regards the thermoelectric properties, the electrical resistivity of the Fe<sub>2-x</sub>Co<sub>1+x</sub>Ga (x = 0.25–1) Heusler compounds was smaller than that of the Fe<sub>2</sub>CoGa Heusler compound. The Seebeck coefficient and power factor of the Fe<sub>1.75</sub>Co<sub>1.25</sub>Ga Heusler compound were more significant than those of the Fe<sub>2</sub>CoGa Heusler compound. An increase in the Co content of the Fe<sub>2</sub>CoGa Heusler compound did not improve the saturation magnetization but improved the Curie temperature and thermoelectric properties of the Fe<sub>2</sub>CoGa Heusler compound. The Fe<sub>1.75</sub>Co<sub>1.25</sub>Ga Heusler compound exhibited a high-power factor value of over 4000 μW/mK<sup>2</sup>, which was comparable to that of the Bi<sub>2</sub>Te<sub>3</sub> compound.https://www.mdpi.com/2304-6740/13/2/33iron alloysHeusler compoundsthermoelectric propertiesmagnetic properties |
| spellingShingle | Tetsuji Saito Hayai Watanabe Magnetic and Thermoelectric Properties of Fe<sub>2</sub>CoGa Heusler Compounds Inorganics iron alloys Heusler compounds thermoelectric properties magnetic properties |
| title | Magnetic and Thermoelectric Properties of Fe<sub>2</sub>CoGa Heusler Compounds |
| title_full | Magnetic and Thermoelectric Properties of Fe<sub>2</sub>CoGa Heusler Compounds |
| title_fullStr | Magnetic and Thermoelectric Properties of Fe<sub>2</sub>CoGa Heusler Compounds |
| title_full_unstemmed | Magnetic and Thermoelectric Properties of Fe<sub>2</sub>CoGa Heusler Compounds |
| title_short | Magnetic and Thermoelectric Properties of Fe<sub>2</sub>CoGa Heusler Compounds |
| title_sort | magnetic and thermoelectric properties of fe sub 2 sub coga heusler compounds |
| topic | iron alloys Heusler compounds thermoelectric properties magnetic properties |
| url | https://www.mdpi.com/2304-6740/13/2/33 |
| work_keys_str_mv | AT tetsujisaito magneticandthermoelectricpropertiesoffesub2subcogaheuslercompounds AT hayaiwatanabe magneticandthermoelectricpropertiesoffesub2subcogaheuslercompounds |