Tuning the magnetocaloric properties of La0.7Ca0.3MnO3 manganites through Ni-doping

Gómez, Andrés Ávila; Chavarriaga, E. A.; Supelano, G. I.; Parra, Carlos; Morán, O.

doi:10.1016/j.physleta.2018.01.030

Cited by 30 publications

(4 citation statements)

References 76 publications

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“…Lanthanum–manganese oxides are frequently discussed for application as oxygen electrodes, for example, in solid oxide cells, as catalysts or as oxygen sensors and supercapacitors. − Some of them are also well known for their colossal magnetoresistive effect, such as Ca-doped LaMnO 3 . − Substitutions at the lanthanum site, for example, by calcium, revealed the possibility to change the material structure and defect chemistry. Defect chemistry is mainly governed by oxygen nonstoichiometry and manganese charge state and plays an important role for the catalytic activity of the material. − Material synthesis methods and conditions affect the defect chemistry. − As they are exposed to varying atmospheres at high temperatures during their application, it is important to investigate how the defect chemistry changes under varying temperature and atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Oxygen Nonstoichiometry and Valence State of Manganese in La_1–xCa_xMnO_3+δ

et al. 2021

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Perovskites of the ABO 3 type, such as LaMnO 3 , can be used as air electrodes in solid oxide fuel cells and electrolyzers. Their properties can be tuned by A- and B-site substitutions. The influence of La substitution by Ca on the oxygen nonstoichiometry has been investigated frequently, but the results depend highly on the synthesis and atmospheric conditions. In this work, a series of La 1– x Ca x MnO 3+δ ( x = 0–0.5) was synthesized using conventional solid-state synthesis under an air atmosphere. The structures of the materials were studied in detail with powder X-ray diffraction. The initial oxygen nonstoichiometries were determined using thermogravimetric reduction. The samples were subsequently analyzed in terms of defect chemistry in dependence of temperature, atmosphere, and Ca content via thermogravimetric analysis. The changes in the manganese charge states were investigated by X-ray absorption near-edge spectroscopy experiments. The influence of intrinsic and extrinsic effects on the Mn-valence state of the differently Ca-substituted samples as calculated from thermogravimetric analysis and as determined directly from X-ray absorption near-edge spectroscopy is presented.

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Section: Introductionmentioning

confidence: 99%

Oxygen Nonstoichiometry and Valence State of Manganese in La_1–xCa_xMnO_3+δ

et al. 2021

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“…Therefore, in order for a material to be a good candidate for industrial or domestic cooling power technology at room temperature, it is necessary to reduce its Curie temperature by taking into account the modulation of the relative ratio Mn 3+ /Mn 4+ [14][15][16]. This can be achieved by the substitution of manganese with a non magnetic ion which destroys the FM interactions and enhances the nonmetallic character in the material [17,18]. However, new investigation in this field modification at the B site has attracted surging attention owing to their important effect on the hybridization of the valence states between the oxygen and the B site ion.…”

Section: Introductionmentioning

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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“…Furthermore, the creation of lacuna [16] or the insertion of cations such as Bi, Ca and Sr in A or B site of the perovskite separately or simultaneously [17,18] lead to the modification of such physical properties [19] as charge-ordering [20] and orbital density [21]. In general, the valence of Mn ions (Mn 3+ vs. Mn 4+ ) controls the magnetic and electrical behaviour in these compounds.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of La0.5Ca0.5−x□xMnO3 nanocrystalline manganites by sucrose assisted auto combustion route and study of their structural, magnetic and magnetocaloric properties

Moumen

Gagou

Chettab

et al. 2019

J Mater Sci: Mater Electron

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Perovskite manganite La 0.5 Ca 0.5-x □ x MnO 3 (LCMO) nanomaterials were elaborated using the sucrose modified auto combustion method. Rietveld refinements of the X-ray diffraction patterns of the crystalline structure confirm a single-phase orthorhombic state with Pbnm space group (No. 62). The Ca-vacancies were voluntarily created in the LCMO structure in order to study their influence on the magnetic behaviour in the system. The magnetic susceptibility was found to be highly enhanced in the sample with Ca-vacancies.Paramagnetic-to-ferromagnetic phase transition was evidenced in both samples around 254 K.This transition is, characterized by a drastic jump of the susceptibility in the sample with Cavacancies. The maximum of entropy change, observed for both compounds at magnetic field of 6T was 2.30 J kg -1 K -1 and 2.70 J kg -1 K -1 for the parent compound and the lacunar one respectively. The magnetocaloric adiabatic temperature change value calculated by indirect method was 5.6 K and 5.2 K for the non-lacunar and Ca-vacancy compound, respectively.The Ca-lacunar La 0.5 Ca 0.5-x □ x MnO 3 (x=0.05) reported in this work demonstrated overall enhancement of the magnetocaloric effect over the LCMO. The technique used to elaborate LCMO materials was beneficial to enhance the magnetocaloric effect and magnetic behaviour. Therefore, we conclude that this less costly environmentally friendly system can be considered as more advantageous candidate for magnetic refrigeration applications then the commonly Gd-based compounds.

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Tuning the magnetocaloric properties of La0.7Ca0.3MnO3 manganites through Ni-doping

Cited by 30 publications

References 76 publications

Oxygen Nonstoichiometry and Valence State of Manganese in La_1–xCa_xMnO_3+δ

Oxygen Nonstoichiometry and Valence State of Manganese in La_1–xCa_xMnO_3+δ

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

Synthesis of La0.5Ca0.5−x□xMnO3 nanocrystalline manganites by sucrose assisted auto combustion route and study of their structural, magnetic and magnetocaloric properties

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Tuning the magnetocaloric properties of La0.7Ca0.3MnO3 manganites through Ni-doping

Cited by 30 publications

References 76 publications

Oxygen Nonstoichiometry and Valence State of Manganese in La1–xCaxMnO3+δ

Oxygen Nonstoichiometry and Valence State of Manganese in La1–xCaxMnO3+δ

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

Synthesis of La0.5Ca0.5−x□xMnO3 nanocrystalline manganites by sucrose assisted auto combustion route and study of their structural, magnetic and magnetocaloric properties

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Oxygen Nonstoichiometry and Valence State of Manganese in La_1–xCa_xMnO_3+δ

Oxygen Nonstoichiometry and Valence State of Manganese in La_1–xCa_xMnO_3+δ