Magnetocaloric effect in La0.8Sr0.2MnO3 manganite

Abstract

The polycrystalline manganite La 0.75 Sr 0.25 MnO 3 prepared by an alternative carbonate precipitation route reveals the rhombohedral perovskite structure. Magnetization isotherms measured up to 2 T are used to determine Curie temperature of 332 K by means of Arrott plot. Maximum of magnetic entropy change is found at Curie temperature. The relative cooling power equal to 64 J/kg for 1.5 T magnetic field, is superior as compared to the manganite with the same chemical composition from the sol-gel method.

Large magnetic entropy change above 300 K in (La0.56Ce0.14)Sr0.3MnO3 perovskite

“…2, we plot the H/M vs. M 2 curves to clarify the order nature of the phase transition. The plots of H/M vs. M 2 show a positive slope in the complete M 2 range, which confirms that our doped sample exhibits a second-order FM to PM phase transition [12,13].…”

Magnetocaloric effect in La0.75Sr0.25MnO3 manganite

“…Therefore, the magnetization isotherms were recorded up to 2 T between 286 and 340 K (Fig. 3) following a method described separately [3] and [4]. At temperatures close to 286 K, magnetization exhibits an abrupt increase below about 1500 Oe, which is followed by a slow approach to saturation.…”

“…The magnetic entropy change DS was calculated from magnetization isotherms for magnetic fields of 0.5, 1, 1.5 and 2 T following the standard procedure [2], [3] and [4]. The negative values of DS achieve a minimum located close to the Curie temperature (Fig.…”

The Structural, Magnetic, and Magnetocaloric Properties of La1−x Ag x MnO 3 (0.05 ≤ x ≤ 0.25)

“…Magnetic cooling systems have high efficiency and are used in scientific and technological purposes at very low temperatures below room temperature. There has been an increase in research on the magnetocaloric effect (MCE) of manganitebased materials, due to the possibility of applying this effect for magnetic refrigeration close to room temperature [1][2][3][4][5].…”