Structural and magnetic properties of La0.6−x□xCa0.4MnO3 (0≤x≤0.2) perovskite manganite

Walha, I.; Ehrenberg, Helmut; Fueß, H.; Cheikhrouhou, A.

doi:10.1016/j.jallcom.2009.06.121

Cited by 20 publications

(4 citation statements)

References 13 publications

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“…For S0 and S5 samples the measured spontaneous magnetizations at T = 2K are reached at around 71.5 emu/g (~ 3.04 µ B /Mn) and 68.3 emu/g (~ 2.89 µ B /Mn), respectively while the calculated values for full spin alignment are 3.5 µ B /Mn and 3.4 µ B /Mn, respectively. The deviation between the experimental and theoretical values could be explained by the non-full alignment of the spin (canted state) at low temperature observed also in several other studies [52,53]. In a similar way we notice that remnant magnetization (Mr) decreases from 34.95emu/g in S0 to 30.54 emu/g in S5 while the coercive field (Hc) is observed to increase from 751 Oe in S0 to 812 Oe in S5.…”

supporting

confidence: 85%

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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confidence: 85%

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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“…Brion believed that when x mol of La 3+ is replaced with a vacancy, 3x mol of Mn 3+ is converted into Mn 4+ . Walha et al (2009) found that Mn 4+ increased with the vacancy concentration. However, Sankar (Joy et al, 2002) prepared La 1x MnO 3 using the solid-phase method, which indicated that Tc increased with the vacancy concentration but Mn 4+ decreased.…”

Section: Vacancy Dopingmentioning

confidence: 97%

Research Progress of Doped Manganite Materials in Magnetic Refrigeration

Xie

Zou

et al. 2021

Front. Mater.

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Magnetic refrigeration technology is a new, green, high-efficiency approach. It has attracted increasing attention from researchers and has a strong competitiveness over traditional refrigeration methods. With the continuous development of social lives, magnetic refrigeration technology must have important application prospects. This article briefly describes the basic principles. The focus is on the introduction and summary of research on perovskite manganite doping in magnetic refrigeration. Finally, the outlook and summary of magnetic refrigeration technology are presented.

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“…For the self-doped manganites, such as La 1−x MnO 3 , a number of researchers have assumed that there were vacancies at the A sites and that the number of vacancies was related to the self-doping level. [10][11][12][13][14][15] However, the available volume of the B sites was smaller than that of the A sites in the ABO 3 perovskite structure. Therefore, based on the thermal equilibrium theory of crystal defects, our group [16] proposed that, in fact, there should be no cation vacancies at the A sites related to the self-doping level.…”

Section: Introductionmentioning

confidence: 99%

Structural and magnetic properties of La _0.7 Sr _0.1 Ag _x MnO _3−δ perovskite manganites

Hou

et al. 2015

Chinese Phys. B

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Ag-doped manganite powder samples, La0.7Sr0.1AgxMnO3−δ (x = 0.00, 0.025, 0.05, 0.075, and 0.10) were synthesized using the sol–gel method. X-ray diffraction patterns indicated that the samples had two phases with the perovskite being the dominant phase and Mn3O4 being the second phase. X-ray energy dispersive spectra indicated that the ratio of Ag to La was very close to that of the nominal composition in the samples. The specific saturation magnetizations at 300 K increased from 32.0 A·m2/kg when x = 0.00 to 46.8 A·m2/kg when x = 0.10. The Curie temperature, TC, of the samples increased from 310 K when x = 0.00 to 328 K when x = 0.10. Because the atomic concentration ratios of La, Sr, and Mn in the five samples were all the same and only the Ag concentration changed, the variations of the specific saturation magnetizations at 300 K and the Curie temperatures suggested that the Ag cations have been doped into the A sites of the perovskite phase in the samples.

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Structural and magnetic properties of La0.6−x□xCa0.4MnO3 (0≤x≤0.2) perovskite manganite

Cited by 20 publications

References 13 publications

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

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

Research Progress of Doped Manganite Materials in Magnetic Refrigeration

Structural and magnetic properties of La _0.7 Sr _0.1 Ag _x MnO _3−δ perovskite manganites

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Structural and magnetic properties of La0.6−x□xCa0.4MnO3 (0≤x≤0.2) perovskite manganite

Cited by 20 publications

References 13 publications

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

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

Research Progress of Doped Manganite Materials in Magnetic Refrigeration

Structural and magnetic properties of La 0.7 Sr 0.1 Ag x MnO 3−δ perovskite manganites

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Structural and magnetic properties of La _0.7 Sr _0.1 Ag _x MnO _3−δ perovskite manganites