Magnetic entropy change in La0.67−Ca0.33MnO3

Magnetocaloric effect in CeCo4B compound

“…It was concluded that the small value of magnetic entropy change in CeCo 4 B sample is closely related with the small value of saturation magnetisation and nature on phase transition. Generally, the materials with second-order magnetic phase transitions exhibit very small MC effect than the materials with first-order magnetic phase transition [21,22]. The magnetic free energy F(M,T) can be expanded as a Landau expansion in powers of magnetisation M neglecting higher order parts as By plotting H/M versus M 2 in the critical region which is called Arrott plot, the slope of the resulting curves denotes whether a magnetic transition is of first-or second order.…”

Detailed discrimination of the order of magnetic transitions and magnetocaloric effect in pure and pseudobinary Co Laves phases

“…The applicability of a given material depends also sometimes on the order of its phase transitions. This is the case in the very much studied family of the magnetocaloric materials including alloys [2,3] and oxides [4,5], among other systems, in which sometimes the first order nature of the magnetic phase transitions has, in principle, a positive impact on applications [6].…”

Magnetic entropy change in polycrystalline La1−xKxMnO3 perovskites

“…Therefore, a refrigeration unit composed of several manganites with different T C can be spanned over a wide range of temperature (viz., 260-340 K). Magnetic entropy change on divalent alkaline-earth-doped lanthanide manganites with various compositions have been reported widely [3,4,12,[16][17][18][19][20][21][22][23][24][25][26][27][28]. However, investigations on monovalent alkali-metal-doped manganites are relatively few [7,29,30].…”