Abstract
In this work, a phenomenological model is applied to describe the magnetocaloric effect for the La0.75Ca0.25MnO3 system near a second-order phase transition from a ferromagnetic to a paramagnetic state. Based on this model, it can predict the values of the magnetocaloric properties from calculation of magnetization as a function of temperature under different external magnetic fields. The magnetic entropy change reaches a peak of about 5.39 J/(kg·K) at 257 K upon 4 T applied field variation. The ΔSM distribution is much more uniform than that of gadolinium, which is desirable for an Ericson-cycle magnetic refrigerator.
Highlights
The development of new refrigeration technology, based upon the magnetocaloric effect (MCE) or electrocaloric effect, has brought an alternative to the conventional gas compression technique [1,2,3,4,5,6,7,8,9]
This paper is about theoretical work on magnetization versus temperature in different magnetic fields for the La0.75Ca0.25MnO3
A conclusion might be drawn that a strong spin-lattice coupling in the magnetic transition process would lead to additional magnetic entropy change near TC, and favors the MCE
Summary
The development of new refrigeration technology, based upon the magnetocaloric effect (MCE) or electrocaloric effect, has brought an alternative to the conventional gas compression technique [1,2,3,4,5,6,7,8,9] This refrigeration provides an efficient and environment-friendly solution for cooling. This paper is about theoretical work on magnetization versus temperature in different magnetic fields for the La0.75Ca0.25MnO3 It used phenomenological model for simulation of magnetization dependence on temperature variation to Journal of Advanced Ceramics 2012, 1(4): 290-295 investigate magnetocaloric properties, such as magnetic entropy change, heat capacity change, temperature change and relative cooling power
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