Magnetocaloric Properties of Rare-Earth-Free Mn₂₇Cr₇Ni₃₃Ge₂₅Si₈ High-Entropy Alloy

Study of dual-phase functionalisation of NiCoFeCr-Alx multicomponent alloys for the enhancement of magnetic properties and magneto-caloric effect

“…As discussed in [49], the possibility of tuning TC whilst keeping the MC properties of a material fairly constant have been one of the most under-studied properties when improving MC-materials performance. Although our ΔSm peak values are an order of magnitude lower than those reported for FeCoNiCuMn [20], (Fe0.76+xTm0.0-xB0.24)96Nb4 [51] and, Mn27Cr7Ni33Ge25Si8 [52], the comparison to the work here should be made with caution. For instance, (Fe0.76+xTm0.0-xB0.24)96Nb4 is of the metallic glass type, Mn27Cr7Ni33Ge25Si8 future a Pnma space structure [52] and magnetic properties as of the FOPT MnCoGe and MnNiGe type of materials [7] [53] and, the ΔSm(T) shape of FeCoNiCuMn-system in [20] reseambles what we obtain at HTT.…”

“…Although our ΔSm peak values are an order of magnitude lower than those reported for FeCoNiCuMn [20], (Fe0.76+xTm0.0-xB0.24)96Nb4 [51] and, Mn27Cr7Ni33Ge25Si8 [52], the comparison to the work here should be made with caution. For instance, (Fe0.76+xTm0.0-xB0.24)96Nb4 is of the metallic glass type, Mn27Cr7Ni33Ge25Si8 future a Pnma space structure [52] and magnetic properties as of the FOPT MnCoGe and MnNiGe type of materials [7] [53] and, the ΔSm(T) shape of FeCoNiCuMn-system in [20] reseambles what we obtain at HTT. The lack of analysis for T < 300 K does not allow a full comparison to be made.…”

Exploring V-Fe-Co-Ni-Al and V-Fe-Co-Ni-Cu High Entropy Alloys for Magnetocaloric Applications

“…( 1). The highest value of 0.75 J/kg.K for a field change of 5 T is comparable to what has been reported for ccp HEAs featuring a SOPT, such as Cr-containing CrFeCoNiPd x and CrFeCoNiAl x [20,59] HEA, which are modifications of the MM'X alloy systems containing hexagonal or orthorhombic structures [60,61]. In order to gain a better understanding of the magnetic order in the as-cast V-Fe-Co-Ni-Cu alloys, pair exchange integrals ( J ij ) were calculated by means of DFT.…”

Review on magnetocaloric high-entropy alloys: Design and analysis methods

“…These│ S peak isothermal │ values mainly saturate to less than 1 J kg −1 K −1 over a wide T transition range in the chart, while the non-equiatomic RE-free HEAs enable at least an order of magnitude enhancement (represented as the open circles and dash lines in Fig. 5b) [22,23]. However, it has to be noted that such magnitudes are still not competitive to high-performing conventional magnetocaloric materials due to the distributed exchange interactions that occur from the disorder as pointed out in refs.…”