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Open Access Research Article Issue
Magnetocaloric effect in La1-xCexMnO3
Journal of Advanced Ceramics 2015, 4 (3): 206-210
Published: 04 July 2015
Downloads:20

The magnetocaloric effect is calculated for La1-xCexMnO3 system near a phase transition from ferromagnetic to paramagnetic state as a function of temperature. It is suggested by the results that La1-xCexMnO3 material can be utilized as the working material in an active magnetic regenerative refrigerator with large temperature span, for its significant entropy change upon the application of a magnetic field and the easily tuned Curie temperature.

Open Access Research Article Issue
Theoretical investigations on electrocaloric properties of (111)-oriented PbMg1/3Nb2/3O3 single crystal
Journal of Advanced Ceramics 2013, 2 (4): 308-312
Published: 04 December 2013
Downloads:19

The electrocaloric (EC) effect accompanied with the ferroelectric to paraelectric phase transition in (111)-oriented PbMg1/3Nb2/3O3 (PMN) is investigated. It is shown that the largest change ΔT is 0.37 K in 3 kV/cm electric field shift near the Curie temperature of 221 K; that is, the cooling ΔT per unit field (MV/m) is 1.23×10-6 m·K/V. This value is significantly larger, and comparable with the value of 0.254×10-6 m·K/V for PbZr0.95Ti0.05O3 thin film under larger electric field shift ΔE = 30 kV/cm. Thus, the EC effect of (111) PMN single crystal provides cooling solutions at low temperatures, and opens more opportunities for practical application in cooling systems.

Open Access Research Article Issue
Magnetocaloric effect in La0.7Sr0.3MnO3/Ta2O5 composites
Journal of Advanced Ceramics 2013, 2 (3): 213-217
Published: 07 September 2013
Downloads:39

The magnetocaloric effect (MCE) achieved for La0.7Sr0.3MnO3/Ta2O5 composites has been investigated. The maximum value of magnetic entropy change of La0.7Sr0.3MnO3 composites is found to decrease slightly with the further increasing of Ta2O5 concentration. It is shown that La0.7Sr0.3MnO3/Ta2O5 composites exhibit much more uniform magnetic entropy change than that of gadolinium. Moreover, the results indicate that the temperature range between 100 K and 400 K can be covered using the La0.7Sr0.3MnO3/Ta2O5 composites. Therefore, MCE makes the composites promising for room-temperature magnetic cooling applications.

Open Access Research Article Issue
Theoretical work on magnetocaloric effect in La0.75Ca0.25MnO3
Journal of Advanced Ceramics 2012, 1 (4): 290-295
Published: 09 January 2013
Downloads:30

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 ∆SM distribution is much more uniform than that of gadolinium, which is desirable for an Ericson-cycle magnetic refrigerator.

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