Magnetocaloric properties of the LaFe11.7Si1.3 and LaFe11.2Co0.7Si1.1 systems

Effect of interstitial nitrogen on magnetism and entropy change of LaFe11.7Si1.3 compound

“…For the parent LaFe 11.7 Si 1.3 alloy, this magnitude of ÀDS is in good agreement with that of LaFe 11.7 Si 1.3 reported in Refs. [3,12], where the largest values of entropy change are 30 and 29 J/kg K under 5 T, respectively. The dramatic decrease of the MCE after nitrogenation is mainly due to the large change of magnetic transition from first to second order, which is associated with the disappearance of the IEM transition.…”

Influence of boron on the giant magnetocaloric effect of La(Fe0.9Si0.1)13

“…So it is of much importance to develop magnetic refrigerants which have giant magnetocaloric effect (GMCE) under low applied external magnetic fields at higher temperatures especially near room temperature [3]. Since the discovery of GMCE in Gd 5 Si 2 Ge 2 by Pecharsky and Gschneidner [4] in 1997, some materials, such as Gd 5 (Si 1Àx Ge x ) 4 [5], MnFe-P 0.45 As 0.45 [6], MnAs 1Àx Sb x [7] and La(Fe x Si 1Àx ) 13 [8] with giant magnetocaloric effect have been reported. Further effort is needed to develop new materials with giant magnetocaloric effect or to improve the magnetocaloric effect for existing materials, including adjusting their Curie temperature to be near room temperature and enhancing their magnetic entropy change in low applied field.…”

“…It has been reported that La(Fe x Si 1Àx ) 13 (0.86pxp0.90) exhibits large isothermal magnetic entropy change (DS M ) just above the Curie temperature (T c ) due to the first-order magnetic transition from the paramagnetic to ferromagnetic state [9][10][11][12][13]. With increasing Fe concentration x, the T c of La(Fe x Si 1Àx ) 13 (0.86pxp0.90) increases, but unfortunately its magnetic entropy change decreases dramatically.…”

“…With increasing Fe concentration x, the T c of La(Fe x Si 1Àx ) 13 (0.86pxp0.90) increases, but unfortunately its magnetic entropy change decreases dramatically. Recently, some researches have found that introducing the hydrogen into the lattice of La(Fe x Si 1Àx ) 13 increases its Curie temperature T c considerably without much affecting its magnetocaloric properties [14][15][16]. Unfortunately, the hydrides are usually chemically unstable above 150 1C, which is an underlying problem for practical application.…”

“…Partial substitution of Ce for La can enhance the isothermal magnetic entropy change (DS M ) caused by the latent heat, but decrease the Curie temperature T c [17]. Alloying substitution in the La(Fe x Si 1Àx ) 13 on the magnetocaloric effect has not been reported. In this work, the influence of boron addition on the GMCE and T c of La(Fe 0.9 Si 0.1 ) 13 is investigated.…”