Magnetocaloric effect in LaFe11.8−xCoxSi1.2 melt-spun ribbons

Structural and Magnetic Studies of the LaFe11.2Co0.7-xMnxSi1.1 (where x=0.1, 0.2) Alloys

“…From practical view point, an active regenerator of magnetic refrigerator should exhibit a high magnetic entropy change ∆S M , the Curie temperature close to ambient temperature, relatively low price, and non-toxicity. The La(Fe,Si) 13 group of alloys obeys these conditions, due to high Fe content and excellent magnetic properties of fcc NaZn 13 -type structure [1][2][3]8]. As it was shown in [1][2][3]8], even a slight devation of chemical composition of the La(Fe,Si) 13 alloys causes changes in magnetic properties.…”

“…The Fe-based alloys are intensively studied due to their specific magnetic properties, including the magnetocaloric effect (MCE) in the vicinity of room temperature [1][2][3][4][5][6]. The MCE is currently the most efficient cooling technique with efficiency reaching up even 60% (in the Ericsson cycle) [7].…”

Influence of Al and Ga on Formation of the La(Fe,Si)13-Type Phase in the LaFe11.14Co0.66Si1.2-xMx(where x=0.1, 0.2, 0.3; M=Al, Ga) Alloys

“…This type of alloys reveals relatively high ∆S M , which reaches even 31 J/(kg K) at the T C of 185 K. The Curie temperature and the value of MCE are strongly dependent on the chemical composition and processing techniques [12,13]. Such promising magnetocaloric properties are related to the magnetic phase transition in the crystalline pseudobinary La(Fe,Si) 13 cubic phase (1:13) [12]. Recent studies of this type of alloys are concentrated on the influence of alloying addition such as Ce, Co, and B on the formation of the La(Fe,Si) 13 -type phase [14,15].…”

“…Microstructure of these alloys in the as-cast state is dendritic, but long time annealing at 1323 K leads to formation of cubic La(Fe,Si) 13 -type * e-mail: pgebara@wip.pcz.pl phase and homogeneity of microstructure [11]. This type of alloys reveals relatively high ∆S M , which reaches even 31 J/(kg K) at the T C of 185 K. The Curie temperature and the value of MCE are strongly dependent on the chemical composition and processing techniques [12,13]. Such promising magnetocaloric properties are related to the magnetic phase transition in the crystalline pseudobinary La(Fe,Si) 13 cubic phase (1:13) [12].…”

Phase constitution, magnetic ordering and microstructure of the LaFe11.0Co0.8Si1.2alloy

“…Magnetocaloric effect is observed in wide range of temperatures from 195 to 330K and depends on the alloy composition [10,11]. The largest magnetic entropy change was measured for LaFe 11.8 Si 1.2 alloy, for which |ΔS M | reaches 31 J(kg K) -1 at μ 0 ΔH ~ 5T around 202K [12]. Such good magnetocaloric properties were due to the transition from ferro-to paramagnetic state, accompanied by the change of the lattice parameter of the La(Fe,Si) 13 -type phase around T C .…”