Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1803140 | Journal of Magnetism and Magnetic Materials | 2006 | 5 Pages |
Abstract
Polycrystalline perovskite La0.67Ca0.33MnO3 was synthesized by a sol-gel method. Its adiabatic temperature change ÎTad induced by a magnetic field change was measured directly. At 268 K, near its Curie temperature TC, ÎTad of La0.67Ca0.33MnO3 induced by a magnetic field change of 2.02 T reaches 2.4 K. The latent heat Q and magnetic entropy change âÎSM induced by a magnetic field change were calculated from the temperature dependence of ÎTad and zero-field heat capacity Cp. The maximum values of Q and âÎSM in La0.67Ca0.33MnO3 induced by a magnetic field change of 2.02 T are 1.85 J gâ1 and 6.9 J kgâ1 Kâ1, respectively. The former is larger than the phase transition latent heat of heating or cooling, which is about 1.70 J gâ1.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
G.C. Lin, Q. Wei, J.X. Zhang,