DR-08 The Effect of Cu Doping on the Magnetic and Magnetocaloric Properties of Al1.2Si0.15Fe2-xCuxB2
Creators: Sumaiya Rahman
Jemma R DeFeo
Hauwa Adedo
Venkateswara Yenugonda
Arjun. K. Pathak
Mahmud Khan
Publisher: name: IEEE
Year: 2025

Due to the large entropy changes it exhibits near room temperature, the intermetallic compound AlFe2B2 has gained much attention in recent years [1, 2]. The material crystallizes in a Cmmm orthorhombic structure and exhibits a ferromagnetic transition between TC = 274 K – 320 K. Peak entropy changes between -2.1 J/kg K and -4.4 J/kg K have been reported for a field change of 2 T. Partial doping of Si for Al in Al1.2-xSixFe2B2 significantly increases the magnetocaloric properties of the system. For a field change of 5 T, a peak magnetic entropy change of -7.4 J/kg K has been observed in the system for x = 0.15 [3]. Here we present an experimental study on the effect of Cu doping on the magnetic and magnetocaloric properties of Al1.2Si0.15Fe2-xCuxB2. X-ray diffraction, dc magnetization, and resistivity measurements have been performed on the system for x=0.05, 0.1, 0.15. Although the orthorhombic phase was dominant the system the percentage of FeB phase increased in the samples with increasing Cu concentration. The TC also decreased from ~308 K (x = 0.05) to ~300 K (x=0.15) with increasing Cu concentration. Peak entropy changes of more than -5 J/kg K along with a refrigeration capacity of 160 J/K were observed in the system. The experimental results will be presented and discussed in detail. The work at State University of New York (SUNY), Buffalo State University, was supported by the National Science Foundation Award No. DMR-2213412.References: 1) X. Tan, P. Chai, C. M. Thompson and M. Shatruk, J. Am. Chem. Soc., Vol. 135, p.9553 (2013) 2) A. E. Boukili, N. Tahiri and E. Salmani, Intermetallics., Vol. 104, p.84 (2019) 3)Md Sakhawat Hossain, Kyra Stillwell and S. Agbo, Journal of Magnetism and Magnetic Materials., Vol. 571, 170576 (2023)
Due to the large entropy changes it exhibits near room temperature, the intermetallic compound AlFe2B2 has gained much attention in recent years [1, 2]. The material crystallizes in a Cmmm orthorhombic structure and exhibits a ferromagnetic transition between TC = 274 K – 320 K. Peak entropy changes between -2.1 J/kg K and -4.4 J/kg K have been reported for a field change of 2 T. Partial doping of Si for Al in Al1.2-xSixFe2B2 significantly increases the magnetocaloric properties of the system. For a field change of 5 T, a peak magnetic entropy change of -7.4 J/kg K has been observed in the system for x = 0.15 [3]. Here we present an experimental study on the effect of Cu doping on the magnetic and magnetocaloric properties of Al1.2Si0.15Fe2-xCuxB2. X-ray diffraction, dc magnetization, and resistivity measurements have been performed on the system for x=0.05, 0.1, 0.15. Although the orthorhombic phase was dominant the system the percentage of FeB phase increased in the samples with increasing Cu concentration. The TC also decreased from ~308 K (x = 0.05) to ~300 K (x=0.15) with increasing Cu concentration. Peak entropy changes of more than -5 J/kg K along with a refrigeration capacity of 160 J/K were observed in the system. The experimental results will be presented and discussed in detail. The work at State University of New York (SUNY), Buffalo State University, was supported by the National Science Foundation Award No. DMR-2213412.References: 1) X. Tan, P. Chai, C. M. Thompson and M. Shatruk, J. Am. Chem. Soc., Vol. 135, p.9553 (2013) 2) A. E. Boukili, N. Tahiri and E. Salmani, Intermetallics., Vol. 104, p.84 (2019) 3)Md Sakhawat Hossain, Kyra Stillwell and S. Agbo, Journal of Magnetism and Magnetic Materials., Vol. 571, 170576 (2023)