Impact of silicon doping on the magnetocaloric effect of MnFeP0.35As0.65 powder

Influence of Partial Substitution of Fe by Mn on the Thermomagnetic Properties of Magnetocaloric LaFe11.2Co0.7Si1.1 Alloy

“…The magnetic cooling based on the magnetocaloric effect (MCE) is an interesting alternative to conventional refrigeration due to its high efficiency ( 60%) and environmental-friendliness process [1]. The magnetocaloric materials (MCMs), like Gd 5 Si 2 Ge 2 [2,3], Mn-FeX (where X = P, B, As) [4], Ni-Mn-Ga [5] and MnCoGe-based [6] are characterized by structural transformation in the vicinity of T C , which results in high magnetic entropy change ∆S M and adiabatic temperature change ∆T ad . These alloys are relatively expensive due to the high content of elements such as Gd, Mn or Co.…”

Magnetocaloric Properties of Mn1.1Fe0.9P0.5As0.5−xGex (0 ≤ x ≤ 0.1) Compounds

“…It was also found that the maximum adiabatic temperature change in silicon-doped MnFeP 0.35 As 0.65 compounds can be correlated with the maximum crystal unit cell volume [15]. …”

“…In our recent study, it was found that silicon as a fifth element (substituted for arsenic) may increase magnetic entropy change as well as adiabatic temperature change in Fe 2 P-type compounds. It was also found that the maximum adiabatic temperature change in silicon-doped MnFeP 0.35 As 0.65 compounds can be correlated with the maximum crystal unit cell volume [ 15 ].…”

Effect of off-stoichiometry and Ta doping on Fe-rich (Mn,Fe)2(P,Si) based giant magnetocaloric materials

“…Different optimization strategies have been proposed to adjust the GMCE performance of (Mn,Fe) 2 (P,Si)-based MCMs like tuning the metallic (Fe-Mn) and nonmetallic (P-Si) ratios [7,8], chemical pressure engineering (substitutional/interstitial doping) including light elements doping (Li, B, C, N, F, S) [9][10][11][12], 3d transition metal doping (V, Co, Ni, Cu, Zn) [13][14][15], 4d transition metal doping (Zr, Nb, Mo, Ru) [16][17][18][19], other element doping (Al, Ge, As) [20][21][22][23] and nano-structuring [24]. Alloying with doping elements does not necessarily only tune the T tr (towards higher T tr -Li, B, C, Al, Ge, Zn and Zr; towards lower T tr -N, F, S, V, Ni, Co, Cu, Ge, Nb, Mo and Ru), but potentially also change the ΔT hys , which is detrimental to the cooling/heating efficiency [25].…”

“…With Ta doping the ΔT hys remains almost constant (about 5 K). This is the first experimental observation of a constant ΔT hys upon doping, which differs from the situation like doping with light elements (B, C, N, F, S) [10][11][12], doping with 3d transition metals (V, Co, Ni, Cu, Zn) [13][14][15] and doping with 4d transition metals (Zr, Nb, Mo, Ru) [16][17][18][19] and doping with other elements (Al, Ge, As) [20][21][22][23]. However, in comparison to Nb substitution, Ta (r = 1.70 Å) has a comparable covalent radius as Nb (r = 1.64 Å) [38], and therefore generally similar physical properties are expected as a result of the comparable chemical pressure.…”