Above room temperature magnetocaloric effect in perovskite Pro(0.6)Sr(0.4)MnO(3)

作者：Zemni S^*; Baazaoui M; Dhahri Ja; Vincent H; Oumezzine M

来源：Materials Letters, 2009, 63(3-4): 489-491.

DOI：10.1016/j.matlet.2008.11.019

• RE peroveskites
• Manganites
• Magnetocaloric effect

The dependence of magnetization M on the applied magnetic field H and temperature T was measured carefully, near the Curie temperature T-c for the perovskite manganite sample Pr0.6Sr0.4MnO3. The experimental results indicate that this specimen exhibit ferromagnetic (FM) to paramagnetic (PM) transition at Tc-320 K. In the 200 K-45 K temperature range the spontaneous magnetization was decreasing. probably due to spin canted state between manganese and praseodymium spin systems. At 46 K the magnetization presents a second little transition, which call be ascribed to very weak traces of secondary Mn3O4 phase, and remains constant between 10 K and 46 K. The maximum value of the magnetic entropy change obtained front the M(H) plot data is |Delta S-M(max)|=2.3 Jkg(-1) K-1 for applied magnetic held of 2.5 T. At this value of magnetic field the relative cooling power (RCP) is 34.5 Jkg(-1). The temperature corresponding to Delta S-M maximum value is almost equal to Tc. The large entropy change call be attributed to the fact that the ferromagnetic transition enhances the effect of the applied magnetic held greatly. It is Suggested by the results that this compound can be used as the working material in an active magnetic regenerative refrigerator above room temperature.

• 出版日期2009-2-15