Magnetocaloric effect in La1-x Ce x MnO3

The magnetocaloric effect (MCE) of La0.5Ca0.1Ag0.4MnO3 (LCAMO) is simulated using a phenomenological model (PM). The LCAMO MCE parameters are calculated as the results of simulations for magnetization vs. temperature at different values of external magnetic field (Hext). The temperature range of MCE in LCAMO grew as the variation in Hext increased, eventually covering the room temperature at high Hext values. The MCE of LCAMO is tunable with the variation of Hext, proving that LCAMO is practically more helpful as a magnetocaloric (MC) material for the development of magnetic refrigerators in an extensive temperature range, including room temperature and lower and higher ones. The MCE parameters of LCAMO are practically greater than those of some MC samples in earlier works.

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“…According to PM, as described in Hamad (2012Hamad ( , 2015cHamad ( , 2015d, the magnetization (M) vs. temperature is simulated by:…”

Section: Theoretical Considerationsmentioning

confidence: 99%

Investigations on Strong-Tuned Magnetocaloric Effect in La0.5Ca0.1Ag0.4MnO3

Hamad

Alamri

2022

Front. Mater.

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“…For a magnetic material with a ferromagnetic (FM) to paramagnetic (PM) transition, a phenomenological model proposed by Hamad [13] is widely used to simulate the temperature evolution of magnetization and to investigate the magnetocaloric properties, such as magnetic entropy change, the RCP and the heat-capacity change [14,15]. For a magnetic system with multiple magnetic transitions, Hsini et al [16] have used this phenomenological model to simulate the magnetocaloric results in the charge ordered Pr 0.5 Sr 0.5 MnO 3 manganite.…”

Section: Introductionmentioning

confidence: 99%

Prediction of magnetic and magnetocaloric properties in $$\hbox {Pr}_{0.8-x}\hbox {Bi}_{x}\hbox {Sr}_{0.2}\hbox {MnO}_{3}$$ Pr 0.8 - x Bi

2019

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In this work, we have investigated the magnetic and magnetocaloric properties of Pr 0.8−x Bi x Sr 0.2 MnO 3 (x = 0, 0.05 and 0.1) polycrystalline manganites prepared by sol-gel route on the basis of a phenomenological model. Temperature dependence of magnetization indicates that all our samples exhibit a second order paramagnetic to ferromagnetic transition with a decrease in temperature. A correlation between experimental results and theoretical analysis based on a phenomenological model is investigated. The magnetic and magnetocaloric measurements are well simulated by this model. Under a magnetic applied field of 5 T, the theoretical absolute values of the maximum of magnetic entropy change S Max are found to be equal to 5.33, 3.33 and 2.97 J kg −1 K −1 for x = 0, 0.05 and 0.1 respectively. The relative cooling power and the specific heat capacity values are also estimated. The predicted results permit us to conclude that our compounds may be promising candidates for magnetic refrigeration at low temperatures.

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