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Substitution effects of V, Ti and C in AlFe 2−x V x B 2  ( x ≤ 0.15), AlFe 2−y Ti y B 2  ( y ≤ 0.15) and AlFe 2 B 2− z C  z  ( z ≤ 0.2) alloys have been investigated. The main phase of these alloys is crystallized in the orthorhombic Cmmm-type structure. The Curie temperature ( T  c ) of these compounds can be tuned from 278 K to be around 300 K depending on the substitution amount. No thermal and magnetic hysteresis can be observed, suggesting the magnetic transition of these alloys is the second-order nature. For a field change of 7 T, the maximum of entropy change (−ΔS max ) of 4.0 J Kg −1  K −1 , 4.2 J Kg −1  K −1  and 3.9 J Kg −1  K −1  has obtained in AlFe 1.9 V 0.1 B 2 , AlFe 1.9 Ti 0.1 B 2  and AlFe 2 B 1.9 C 0.1  alloys. Tunable T  c  and wide temperature span in AlFe 2 B 2  phase suggest that AlFe 2 B 2 -base alloys have a potential application as a refrigerant in magnetic refrigeration.

Substitution effects on the magnetic phase transition and magnetocaloric effects in nanolaminated AlFe2B2 alloys