New complex magnetic materials for an application in Ericsson refrigerator

作者：Othmani S; Blel R; Bejar M^*; Sajieddine M; Dhahri E; Hlil E K

来源：Solid State Communications, 2009, 149(25-26): 969-972.

DOI：10.1016/j.ssc.2009.04.020

• Complex magnetic materials
• Manganites
• Magnetic Ericsson refrigeration
• Magnetocaloric effect

In this paper, a new complex magnetic materials La(0.70)Ca(0.15)Sr(0.15)Mn(1-x)Fe(x)O(3) (x = 0.000, 0.025, 0.050, 0.075 and 0.100), suitable for the Ericsson cycle, has been investigated. For these materials, the effect of Fe doping can be attributed to a combination of doping disorder, Fe-Mn super exchange interactions and a site-percolation mechanism, which suppress the metallic conduction and ferromagnetism. We have found that these compounds crystallize in the rhombohedral structure with the R (3) over barc space group. We have also verified that the substitution of the manganese with iron leads to an important decrease of the Curie temperature T(C) from 335 to 225 K for 0%-10% of Fe. The magnetocaloric study exposes a quite large value of the magnetic entropy change, which decreases when increasing Fe concentration. For an applied magnetic field of 2 T, the Relative Cooling Power (RCP) values are found to vary between 80 and 125 J/kg. As a result, the studied compounds could be considered as potential material for magnetic Ericsson refrigeration by using complex magnetocaloric compounds.

• 出版日期2009-7