Effect of synthesis techniques on structural, magnetocaloric and critical behavior of Pr0.6Ca0.1Sr0.3Mn0.975Fe0.025O3 manganites

Mahjoub, S.; Baazaoui, M.; Hlil, E.K.; Oumezzine, M.

doi:10.1016/j.ceramint.2015.06.078

Cited by 40 publications

(6 citation statements)

References 45 publications

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“…Similar results were reported in ref. 85 and 86 , where the authors suggested that the reduction in the crystallite size presented an intensive impact on the magnetic interactions and strongly influenced the universality class.…”

Section: Resultsmentioning

confidence: 99%

Impact of synthesis route on structural, magnetic, magnetocaloric and critical behavior of Nd_0.6Sr_0.4MnO₃manganite

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Impact of synthesis route on structural, magnetic, magnetocaloric and critical behavior of Nd_0.6Sr_0.4MnO₃manganite

et al. 2021

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“…Munazat等 [71] 则对比了湿混法和溶胶凝胶法制备的纳米晶La 0.7 Ba 0.1 Ca 0.1 Sr 0.1 MnO 3 的磁相变临界行为, 结果表明湿混法所得平均晶粒大小为 40 nm且磁相变表现出长程平均场模型, 而在平均晶粒大小为62 nm的溶胶凝胶法样品中发现了类似三重临界行为. 对于如La-Ca-Mn-O等典型具备一级相变的中带宽锰氧化物而言, 采用球磨 [72,75,79] 和溶胶凝胶法 [76,81] 等制备方法, 并通过制定合适的烧结温度或球磨时间等工艺条件能够实现晶粒大小的精细调控, 可能将一级相变转变为二级并在特定条件下获得三重临界点.…”

Section: 与A位掺杂获得三重临界点现象类似许多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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“…The decrease in the T c from the reported value in the literature can be explained by its relatively small particle size. 23,24 The magnetization isotherm (M-H) measured at various temperatures above and below the T c from 10 to 70 K for HoN is shown in Fig. 5.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Magnetocaloric properties of TbN, DyN and HoN nanopowders prepared by the plasma arc discharge method

et al. 2015

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We report for the first time the synthesis of nanopowders of TbN, DyN and HoN crystallized in a cubic structure by the plasma arc discharge (PAD) method and investigate their magnetocaloric properties for magnetic refrigeration applications. The nitridization of terbium, dysprosium and holmium was obtained using a mixture of nitrogen and argon gas inside a discharge chamber with 4 kPa pressure. The structural and microstructural properties of these rare earth nitrides were investigated by using X-ray diffraction and transmission electron microscopy. The studied nitrides undergo a second-order ferromagnetic to paramagnetic phase transition at Curie temperatures of 35.7, 19.9 and 14.2 K for TbN, DyN and HoN, respectively. The magnetocaloric effects were estimated by calculating the magnetic entropy changes from the magnetization data sets measured at the different applied magnetic fields and temperatures. The changes in entropy -ΔSM were found to be 12.0, 13.6 and 24.5 J kg(-1) K(-1) at an applied magnetic field of 5 T.

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Effect of synthesis techniques on structural, magnetocaloric and critical behavior of Pr0.6Ca0.1Sr0.3Mn0.975Fe0.025O3 manganites

Cited by 40 publications

References 45 publications

Impact of synthesis route on structural, magnetic, magnetocaloric and critical behavior of Nd_0.6Sr_0.4MnO₃manganite

Impact of synthesis route on structural, magnetic, magnetocaloric and critical behavior of Nd_0.6Sr_0.4MnO₃manganite

Research progress of critical behaviors and magnetocaloric effects of perovskite manganites

Magnetocaloric properties of TbN, DyN and HoN nanopowders prepared by the plasma arc discharge method

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Effect of synthesis techniques on structural, magnetocaloric and critical behavior of Pr0.6Ca0.1Sr0.3Mn0.975Fe0.025O3 manganites

Cited by 40 publications

References 45 publications

Impact of synthesis route on structural, magnetic, magnetocaloric and critical behavior of Nd0.6Sr0.4MnO3manganite

Impact of synthesis route on structural, magnetic, magnetocaloric and critical behavior of Nd0.6Sr0.4MnO3manganite

Research progress of critical behaviors and magnetocaloric effects of perovskite manganites

Magnetocaloric properties of TbN, DyN and HoN nanopowders prepared by the plasma arc discharge method

Contact Info

Product

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Impact of synthesis route on structural, magnetic, magnetocaloric and critical behavior of Nd_0.6Sr_0.4MnO₃manganite

Impact of synthesis route on structural, magnetic, magnetocaloric and critical behavior of Nd_0.6Sr_0.4MnO₃manganite