Theoretical investigations on magnetocaloric effect in Er1−Tb Al2 series

Ribeiro, P. O.; Alho, B.P.; Alvarenga, T.S.T.; Nóbrega, E.P.; Sousa, V.S.R. de; Carvalho, A. Magnus G.; Caldas, A.; Oliveira, N.A. de

doi:10.1016/j.jmmm.2014.12.023

Cited by 18 publications

(5 citation statements)

References 23 publications

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“…A separate, important field of study is the magnetocaloric effect [33][34][35] in systems with magnetoelastic coupling [36][37][38][39][40][41][42][43][44][45][46][47][48]. The description of the caloric effects for the case of many interacting subsystems constitutes an interesting problem in thermodynamics and is crucial for the correct modeling of real materials.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of a model solid with magnetoelastic coupling

Szałowski

Balcerzak

Jaščur

2018

Journal of Magnetism and Magnetic Materials

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In the paper a study of a model magnetoelastic solid system is presented. The system of interest is a mean-field magnet with nearest-neighbour ferromagnetic interactions and the underlying s.c. crystalline lattice with the long-range Morse interatomic potential and the anharmonic Debye model for the lattice vibrations. The influence of the external magnetic field on the thermodynamics is investigated, with special emphasis put on the consequences of the magnetoelastic coupling, introduced by the power-law distance dependence of the magnetic exchange integral. Within the fully self-consistent, Gibbs energy-based formalism such thermodynamic quantities as the entropy, the specific heat as well as the lattice and magnetic response functions are calculated and discussed. To complete the picture, the magnetocaloric effect is characterized by analysis of the isothermal entropy change and the adiabatic temperature change in the presence of the external pressure.

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Section: Introductionmentioning

confidence: 99%

Thermodynamics of a model solid with magnetoelastic coupling

Szałowski

Balcerzak

Jaščur

2018

Journal of Magnetism and Magnetic Materials

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“…At this point, it is worth highlighting a subtle difference between the studies developed by von Ranke et al [20,21,28,[42][43][44] and this work. These materials are characterized by the fact that the first neighbors of the rare earth ions are the aluminum ions with lattice parameter values showing negligible variation [41].…”

Section: Theoretical Approach and Calorimetric Measurementsmentioning

confidence: 72%

Simulating selected magnetic properties of Tb _x Pr₁₋ _x Al₂, a magnetocaloric compound

Tedesco,

Jandre,

Carvalho

et al. 2024

J. Phys.: Condens. Matter

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TbxPr1-xAl2 are ferrimagnetic materials exhibiting magnetocaloric effect that have gained considerable attention due to their potential use as an alternative in refrigeration, magnetic sensors and in information storage technology. Here using the mean field approach numerical simulations were conducted for x=0.1, 0.2, 0.3, 0.4, 0.5, and 0.75, to analyse selected physical properties, such as X-ray and neutron powder diffraction, magnetization and heat capacity. The simulations successfully reproduced the experimental data providing a comprehensive characterization and improved understanding of this family of compound.

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“…In fact, Zener's model [6] is strongly recommended to explain this property of the large magnetocaloric effect in manganites. Moreover, Guo et al [41,42] explain the large value of ΔS M by the stronger spin-lattice coupling detected by a simultaneous variation of structural distortion and the magnetic transitions. For practical applications, the cooling efficiency was also evaluated by RCP parameter [43]:…”

Section: Simulation and Discussionmentioning

confidence: 99%

Structural Characterization and Magnetic Interactions of La0.7Sr0.25Na0.05Mn1 - xAlxO3

Zaidi

Elabassi

Selmi

et al. 2020

J Supercond Nov Magn

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The magnetocaloric properties of manganite oxides La0.7Sr0.25Na0.05Mn1 − xAlxO3 (LSNMAlx) synthesized by sol-gel method were studied in detail. X-ray diffraction analyses showed a single rhombohedral phase with the R3-c space group. The inhomogeneous magnetic compartment coupled with the core-shell behavior was used to explain the magnetic properties and the evolution of the paramagnetic-ferromagnetic transition of the materials. Using a phenomenological model, the maximum values of magnetic entropy change (ΔSmax) decreased from 4.92 J kg−1 K for La0.7Sr0.25Na0.05MnO3 to 3.84 J kg−1 K for La0.7Sr0.25Na0.05Mn0.95Al0.05O3 upon an applied magnetic field of μ0H = 5 T, indicating an excellent quality of our samples as compared to many manganite oxides. The high quality of our samples was also checked by the large relative cooling power (RCP) which provides a good performance for industrial technologies in refrigeration devices.

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Theoretical investigations on magnetocaloric effect in Er1−Tb Al2 series

Cited by 18 publications

References 23 publications

Thermodynamics of a model solid with magnetoelastic coupling

Thermodynamics of a model solid with magnetoelastic coupling

Simulating selected magnetic properties of Tb _x Pr₁₋ _x Al₂, a magnetocaloric compound

Structural Characterization and Magnetic Interactions of La0.7Sr0.25Na0.05Mn1 - xAlxO3

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Theoretical investigations on magnetocaloric effect in Er1−Tb Al2 series

Cited by 18 publications

References 23 publications

Thermodynamics of a model solid with magnetoelastic coupling

Thermodynamics of a model solid with magnetoelastic coupling

Simulating selected magnetic properties of Tb x Pr1− x Al2, a magnetocaloric compound

Structural Characterization and Magnetic Interactions of La0.7Sr0.25Na0.05Mn1 - xAlxO3

Contact Info

Product

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Simulating selected magnetic properties of Tb _x Pr₁₋ _x Al₂, a magnetocaloric compound