Large magnetocaloric effect and critical behavior in La0.7Ba0.2Ca0.1Mn1−xAlxO3

Zaïdi, M. A.; Dhahri, J.; Zeydi, I.; Alharbi, T.; Belmabrouk, Hafedh

doi:10.1039/c7ra08162f

Cited by 18 publications

(4 citation statements)

References 49 publications

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“…The value of θ p (θ p = -36 K) is negative, underlining the appearance of an AFM interaction between Cr 3+ ions. We have inferred the effective moment experimental μ eff xp values from the Curie constant employing the following relationship represented as [3]:…”

Section: Methods Resultsmentioning

confidence: 99%

“…On the other hand, the increase above 25 K is probably due to the second phase transition, which was not apparent when the structure of KCrP The magnetic refrigeration capacity (RCP) is a critical metric for an essential feature of the MCE; it is connected with the application of magnetic refrigerators. To evaluate RCP, we also used the following formula [7]:…”

Section: Methods Resultsmentioning

confidence: 99%

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Structural, magnetic, and magnetocaloric studies of the potassium diphosphate KCrP2O7

Elouafi¹,

Ezairi

Lmai

et al. 2023

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The structural, magnetic, and magnetocaloric characteristics of potassium diphosphate KCrP2O7 were thoroughly investigated. A solid-state reaction method has been employed to synthesize this specimen. The crystalline structure was analysed employing X-Ray Diffraction (XRD), infrared, and Raman spectroscopy at around room temperature. Detailed Rietveld refinement analysis reveals that the compound adopts a complex monoclinic structure with the space group P21/c and the lattice parameters: a = 7.357Ǻ, b = 10.011 Ǻ, and c = 8.202 Ǻ. The Magnetic measurements exhibit an antiferromagnetic-paramagnetic behavior with a second order magnetic transition near the Néel temperature TN (TN = 8.5 K) for KCrP2O7. Magnetic entropy change (-∆SM) induced by the magnetic field, was determined by employing the thermodynamic Maxwell's relation. At H=50 kOe, the (-∆S M Max ) and RCP (magnetic refrigeration capacity) near T N show a value of 4.4 J.kg-1 .K-1 and 30.06 J.kg-1, respectively for the KCrP2O7 compound.

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Section: Methods Resultsmentioning

confidence: 99%

Section: Methods Resultsmentioning

confidence: 99%

Structural, magnetic, and magnetocaloric studies of the potassium diphosphate KCrP2O7

Elouafi¹,

Ezairi

Lmai

et al. 2023

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“…另外, 在对典型具备一级相变的La 0.7 Ca 0.3 MnO 3 多晶材料施加超高场的磁性研究中发现, 当磁场强度达到10-14 T范围时, 其一级相变特性被明显抑制, 且磁相变临界参数与三重临界点十分符合 [85] . 而 Ghorai等 [86] [45] 在5 T磁场变化下, 最大等温磁熵变仍达到了14.94 J•kg -1 •K -1 . 而微量Sn掺杂的La 0.7 Ca 0.28 Sn 0.02 MnO 3 化合物 [46] 在仅为1 T磁场变化下的最大磁熵变仍保持了 2.79 J•kg -1 •K -1 , 且相对制冷能力达到55.8 J•kg -1 .…”

Section: 不同磁场强度范围所得磁相变临界参数对比分析unclassified

Research progress of critical behaviors and magnetocaloric effects of perovskite manganites

Zhang¹,

Piao²,

Zhang³

et al. 2021

Acta Phys. Sin.

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Hole-doped perovskite-type manganites have received intensive attention due to their intriguing physical phenomena such as giant magnetocaloric effect and magnetic-phase transitions. However, the mechanism of internal ferromagnetic interaction still needs to be further explored due to the complex natures of competing double-exchange (DE) and super-exchange (SE) interaction, Jahn-Teller (JT) polaron localization, charge ordering, and phase separation scenarios. Critical exponent analysis near magnetic phase transition is a powerful tool to investigate the details of the ferromagnetic interactions and has been used frequently in various magnetocaloric materials. In this article, the critical behavior analyses of perovskite manganites in recent years are comprehensively reviewed. A large number of studies have shown that even in single-phase materials with uniform structure and composition, the critical behavior can be affected by multiple factors such as grain boundary density and the degree of disorder, making them difficult to fully describe the intrinsic ferromagnetism. In this review, firstly, the critical behaviors of typical manganites with different bandwidths in single crystal and polycrystalline are discussed. In a double-exchange dominated system such as La-Sr-Mn-O, short-range 3D-Heisenberg model is basically in good accordance with optimally-doped single crystal sample. However, it would be replaced by long-range mean-field critical behavior in polycrystalline sample when the correlation length exceeds the crystallite size. In a typical intermediate bandwidth system such as La-Ca-Mn-O exhibiting a complex phase diagram described by competing SE/DE interactions, JT polaron localization/delocalization, and Griffith phase disorder, the critical exponent can vary from 3D-Heisenberg model to tricritical mean-field model, for the crossover from first to second order phase transition. Secondly, the studies of elements doping and different fabrication methods indicate that the critical behavior of manganites can be effectively modulated, and vary between different theoretical models including even nonuniversal exponent for highly disordered magnetic system. In the following part, the influence of magnetic field on the critical behavior and field induced crossover phenomena of La-Ca-Mn-O system near tricritical point is analyzed and discussed in detail. Furthermore, the magnetocaloric effects of materials near the tricritical point collected in many studies are listed and compared with each other. Excellent magnetocaloric properties with high magnetic entropy change and relative cooling power in plenty of researches indicate that ideal magnetocaloric material would be very likely to be found in the materials near the tricritical point, which lay at the borderline between first-order and second-order phase transition. Consequently, it is suggested that perovskite manganites are still quite promising in the potential magnetic refrigeration applications, and need to be further developed.

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“…This indicates that the strength of the competing exchange interactions and magnetic properties are eventually affected by different factors such as rare Earth substitution at the A-site, replacement of manganese by other transition elements, the introduction of deciency at A and A 0sites, etc. [28][29][30][31][32][33][34][35][36][37] Recently, many reports have demonstrated that the creation of deciency at the rare Earth and alkaline rare Earth sites alter the Mn 2+ /Mn 3+ /Mn 4+ ratio which severely affect the magnetic and magnetocaloric properties. [37][38][39][40][41][42][43][44][45][46][47][48][49] The structure of manganites is imperfect and contain vacancy type point defects, called Schottky defects due to the cyclic temperature changes during synthesis and sintering process.…”

Section: Introductionmentioning

confidence: 99%

Observation of enhanced magnetic entropy change near room temperature in Sr-site deficient La_0.67Sr_0.33MnO₃ manganite

2019

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Large magnetocaloric effect and critical behavior in La_0.7Ba_0.2Ca_0.1Mn_1−xAl_xO₃

Abstract: The structural, magnetic and magnetocaloric properties of La0.7Ba0.2Ca0.1Mn1−xAlxO3 (0 ≤ x ≤ 0.1) perovskite manganite oxides have been investigated.

Cited by 18 publications

References 49 publications

Structural, magnetic, and magnetocaloric studies of the potassium diphosphate KCrP2O7

Structural, magnetic, and magnetocaloric studies of the potassium diphosphate KCrP2O7

Research progress of critical behaviors and magnetocaloric effects of perovskite manganites

Observation of enhanced magnetic entropy change near room temperature in Sr-site deficient La_0.67Sr_0.33MnO₃ manganite

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Large magnetocaloric effect and critical behavior in La0.7Ba0.2Ca0.1Mn1−xAlxO3

Abstract: The structural, magnetic and magnetocaloric properties of La0.7Ba0.2Ca0.1Mn1−xAlxO3 (0 ≤ x ≤ 0.1) perovskite manganite oxides have been investigated.

Cited by 18 publications

References 49 publications

Structural, magnetic, and magnetocaloric studies of the potassium diphosphate KCrP2O7

Structural, magnetic, and magnetocaloric studies of the potassium diphosphate KCrP2O7

Research progress of critical behaviors and magnetocaloric effects of perovskite manganites

Observation of enhanced magnetic entropy change near room temperature in Sr-site deficient La0.67Sr0.33MnO3 manganite

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Large magnetocaloric effect and critical behavior in La_0.7Ba_0.2Ca_0.1Mn_1−xAl_xO₃

Observation of enhanced magnetic entropy change near room temperature in Sr-site deficient La_0.67Sr_0.33MnO₃ manganite