Magnetic Entropy Change in La0.57Nd0.1Sr0.13Ag0.2MnO3 by Means of Theoretical Models

Nasri, M.; Cherif, A.; Dhahri, E.

doi:10.1007/s10909-019-02190-x

Cited by 6 publications

(5 citation statements)

References 40 publications

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“…The G(M, T ) can be defined in terms of the order parameter of power M, and the coefficients are smooth functions of temperature: [31]…”

Section: Magnetocaloric Characterizationmentioning

confidence: 99%

Magnetocaloric properties and Griffiths phase of ferrimagnetic cobaltite CaBaCo₄O₇

Raoufi¹,

He²,

Wang³

et al. 2023

Chinese Phys. B

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A study on the magnetocaloric properties of a CaBaCo 4 O 7 polycrystalline cobaltite has been undertaken along with research on the nature of magnetic phase transition. The magnetization as a function of temperature identifies the ferrimagnetic (FIM) to paramagnetic (PM) transition at a Curie temperature of 60 K. Moreover, a Griffiths-like phase is confirmed in a temperature range above T C . The compound undergoes a crossover from the first to second-order ferrimagnetic transformation, as evidenced by the Arrott plots, scaling of the universal entropy curve, and field-dependent magnetic entropy change. The maximum of entropy change is 3 J/kg. K for ΔH = 7 T at T C , and a broadening of the entropy peak with increasing magnetic field indicates a field-induced transition above T C . The analysis of the magnetic entropy change using the Landau theory reveals the second-order phase transition and indicates that the magnetocaloric properties of CaBaCo 4 O 7 are dominated by the magnetoelastic coupling and electron interaction. The corresponding values of refrigerant capacity (RC) and relative cooling power (RCP) are estimated to be 33 and 42 J/kg, respectively.

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“…The G(M, T ) can be defined in terms of the order parameter of power M, and the coefficients are smooth functions of temperature: [31]…”

Section: Magnetocaloric Characterizationmentioning

confidence: 99%

Magnetocaloric properties and Griffiths phase of ferrimagnetic cobaltite CaBaCo₄O₇

Raoufi¹,

He²,

Wang³

et al. 2023

Chinese Phys. B

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“…[26][27][28] This model is a simple approach for evaluating all parameters of MCE and yield results consistent with those obtained from previous experimental studies. [29][30][31] The universal law of phase transitions was also studied to confirm the second-order transition in our samples.…”

Section: Introductionmentioning

confidence: 93%

“…According to the phenomenological model, [26][27][28][29][30][31] the variation of magnetization of magnetic materials with temperature in the presence of a magnetic field is as follows:…”

Section: Phenomenological Modelmentioning

confidence: 99%

Prediction of Magnetocaloric Effects of La0.7Sr0.3Mn1-xCuxO3 Compounds (x = 0.08 and 0.12) Using a Phenomenological Model

Ngan

Dang

Nam

et al. 2020

Journal of Elec Materi

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In the present study, we present our investigation on the structure and magnetocaloric effect (MCE) of La 0.7 Sr 0.3 Mn 1Àx Cu x O 3 (x = 0.08 and 0.12) compounds prepared by a conventional solid-state method. X-ray diffraction patterns indicate that the samples have a rhombohedral structure with the R 3c space group. The Curie temperature decreases with increasing Cu concentration. Using a phenomenological model, the MCE of the two samples was predicted from the experimental magnetization data measured at magnetic fields of 3 kOe, 5 kOe, 8 kOe, and 10 kOe. The type of second-order magnetic phase transition of the samples is confirmed by the collapse of the entire master curve of magnetic entropy change in the same plot. Our investigation on the magnetocaloric behavior of the title compounds suggests that they are suitable candidates for application to near-room temperature magnetic refrigeration.

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“…We compute relative cooling power (RCP) to estimate the efficiency of magnetic materials as RCP=normalΔηmax⋅δθnormalFWHM,where, normalΔηmax and δθnormalFWHM are maximum entropy change and temperature difference between full width-half maximum (FWHM) of normalΔη versus θ response curve, respectively [56].…”

Section: Thermodynamics-based Constitutive Model For Magnetic Shape M...mentioning

confidence: 99%

“…where, η max and δθ FWHM are maximum entropy change and temperature difference between full width-half maximum (FWHM) of η versus θ response curve, respectively [56].…”

Section: Thermodynamics-based Constitutive Model For Magnetic Shape M...mentioning

confidence: 99%

Modelling of pressure-induced magnetic and magnetocaloric effects in dissipative magnetic shape memory alloy systems

Kumar,

Haldar

2023

Proc. R. Soc. A.

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This article presents a coupled magneto-thermo-mechanical model of pressure-dependent magneto-caloric effect (MCE) and magnetization responses for polycrystalline magnetic shape memory alloys (MSMA). Coupled constitutive equations are derived from a Helmholtz free energy function in a consistent thermodynamic way. The hysteretic and dissipative characteristics of phase transformations in MSMAs are captured by the internal state variables approach with their evolution equations. A relation of adiabatic temperature change is established for such a dissipative material system. The model is calibrated and validated with the existing experimental data. The validated constitutive model is then exploited to predict MCEs at different pressure and magnetic field level. Some predicted results are compared with the available experimental data.

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Magnetic Entropy Change in La0.57Nd0.1Sr0.13Ag0.2MnO3 by Means of Theoretical Models

Cited by 6 publications

References 40 publications

Magnetocaloric properties and Griffiths phase of ferrimagnetic cobaltite CaBaCo₄O₇

Magnetocaloric properties and Griffiths phase of ferrimagnetic cobaltite CaBaCo₄O₇

Prediction of Magnetocaloric Effects of La0.7Sr0.3Mn1-xCuxO3 Compounds (x = 0.08 and 0.12) Using a Phenomenological Model

Modelling of pressure-induced magnetic and magnetocaloric effects in dissipative magnetic shape memory alloy systems

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Magnetic Entropy Change in La0.57Nd0.1Sr0.13Ag0.2MnO3 by Means of Theoretical Models

Cited by 6 publications

References 40 publications

Magnetocaloric properties and Griffiths phase of ferrimagnetic cobaltite CaBaCo4O7

Magnetocaloric properties and Griffiths phase of ferrimagnetic cobaltite CaBaCo4O7

Prediction of Magnetocaloric Effects of La0.7Sr0.3Mn1-xCuxO3 Compounds (x = 0.08 and 0.12) Using a Phenomenological Model

Modelling of pressure-induced magnetic and magnetocaloric effects in dissipative magnetic shape memory alloy systems

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Magnetocaloric properties and Griffiths phase of ferrimagnetic cobaltite CaBaCo₄O₇

Magnetocaloric properties and Griffiths phase of ferrimagnetic cobaltite CaBaCo₄O₇