Effects of carbon substitution on magnetic properties and magnetocaloric effects in Mn65-xGa17C18+x compounds

Oli, A.; Dubenko, I.; Granovsky, A.; Razhabov, R.; Hill, M.; Koshkid’ko, Y.; Stadler, S.; Ali, N.; Talapatra, S.

Авторы: Oli A., Dubenko I., Granovsky A., Razhabov R., Hill M., Koshkid’ko Yu, Stadler S., Ali N., Talapatra S.
Журнал: Journal of Alloys and Compounds
Том: 1017
Год издания: 2025
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 179036
DOI: 10.1016/j.jallcom.2025.179036
Аннотация: We present an investigation involving the tuning of the magnetic, magnetocaloric, and room-temperature structural properties of Mn65-xGa17C18+x (0 ≤ x ≤ 4) compounds prepared using a high-energy ball milling (HEBM) technique. This study indicates that the crystal structure of all the compounds can be described as ananti-perovskite cubic structure with the Pm-3m space group and the crystal cell volume decreases with increasing carbon concentration. The system shows a first-order structural phase transition at a temperature T = TM between two cubic phases having different magnetic structures. The phases are characterized by antiferromagnetic(AFM) and ferromagnetic (FM) -like behavior at low (T < TM) and high (TM ˃ T) temperature regions, respectively.A suppression of the AFM phase was observed with increasing C concentration. The temperature-inducedfirst-order transitions (FOTs) were found to possess a small thermal hysteresis in the magnetization (~ 2–3 K) inan applied magnetic field of H = 50 kOe. Magnetic entropy changes estimated from isothermal magnetization curves indicate that the largest value of the magnetic entropy change of |ΔSM| = 2.1 J kg-1 K􀀀 1 for x = 4 with ΔH= 50 kOe, with a relative cooling power (RCP) of ~ 190 J kg􀀀 1.Thus high-energy ball milling (HEBM), a scalable technique, has been demonstrated as a viable method to synthesize magnetocaloric materials with substantial RCP values.
Добавил в систему: Грановский Александр Борисович

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Effects of carbon substitution on magnetic properties and magnetocaloric effects in Mn65-xGa17C18+x compoundsстатья

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