VNU Journal of Science, Mathematics - Physics 24 (2008) 30-35
Abstract:
Study of the effect of Nd substitution for La on magnetocaloric effect (MCE) of
polycrystalline perovskites (La1-xNdx)0.7Sr0.3MnO3 (x = 0.0, 0.2 , 0.4, 0.6, 0.8, 1.0 ) is presented.
Large MCE is observed in all samples. The presence of Nd affects to both maximum magnetic
entropy change, | Sm|max, and Curie temperature, TC. | Sm|max slightly reduces with low content
and increases with high content of Nd and gets maximum value of 4.83 J/kg.K for x = 0.8. TC of
the samples determined from the thermomagnetic curves somewhat increases from 346 K for x =
0.0 to 350 K for x = 0.2, then decreases to 235 K for x = 1.0. The sample with x = 0.4 exhibiting
the largest value of 74 J/kg for the relative cooling power among the studied samples has TC = 325
K, i.e. higher than room temperature. Our studied samples are promising materials for magnetic
refrigerants in the room-temperature region.
Description:
VNU Journal of Science, Mathematics - Physics. Vol. 24 (2008), No 1, P. 30-35