Influence of La addition on the structural, magnetic and magnetocaloric properties in Sr 2−x La x FeMoO 6 (0≤ x ≤0.3) double perovskite

Hussain, Imad; Anwar, M. S.; Kim, Jong Woo; Chung, Kookchae; Koo, Bon Heun

doi:10.1016/j.ceramint.2016.05.094

Cited by 50 publications

(9 citation statements)

References 26 publications

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“…Significant reduction in Ms. for the sample (a) compared to samples (b, c) is coherent with both ESR measurements (low factor g) and core-shell model [68]. The core-shell model assumes the formation of a magnetically dead layer of thickness t, which increases with size reduction and can be estimated using the following formula [48]: (1) where t is dead layer thickness and d is crystallite size. As a necessary condition for superparamagnetism, nanoparticles must be formed by small magnetic volumes without exchange interaction [68].…”

Section: Dependence Of the G-factor With The Crystallite Size 71 Detsupporting

confidence: 74%

“…Magnetic nanoparticles (MNPs) display physical and chemical properties different those found in their corresponding bulk materials. These properties make them attractive in widespread applications such as energy, electronics, sensor designs of all kinds, catalysts, magnetic refrigeration, optics, and in various biomedical applications [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and ESR Study of Transition from Ferromagnetism to Superparamagnetism in La_0.8Sr_0.2MnO₃ Nanomanganite

Yahya¹,

Hosni²,

Hamzaoui³

2020

Smart Nanosystems for Biomedicine, Optoelectronics and Catalysis

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Electron spin resonance (ESR) spectroscopy was used to determine the magnetic state transitions of nanocrystalline La 0.8 Sr 0.2 MnO 3 at room temperature, as a function of crystallite size. Ferromagnetic nanoparticles having an average crystallite size ranging from 9 to 57 nm are prepared by adopting the autocombustion method with two-step synthesis process. Significant changes of the ESR spectra parameters, such as the line shape, resonance field (Hr), g-factor, linewidth (∆Hpp), and the low-field microwave absorption (LFMA) signal, are indicative of the change in magnetic domain structures from superparamagnetism to single-domain and multi-domain ferromagnetism by increase in the crystallite size. Samples with crystallite sizes less than 24.5 nm are in a superparamagnetic state. Between 24.5 and 32 nm, they are formed by a single-domain ferromagnetic. The multi-domain state arises for higher sizes. In superparamagnetic region, the value of g-factor is practically constant suggesting that the magnetic core size is invariant with decreasing crystallite size. This contradictory observation with the core-shell model was explained by the phenomenon of phase separation that leads to the formation of a new magnetic state that we called multicore superparamagnetic state.

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Section: Dependence Of the G-factor With The Crystallite Size 71 Detsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Synthesis and ESR Study of Transition from Ferromagnetism to Superparamagnetism in La_0.8Sr_0.2MnO₃ Nanomanganite

Yahya¹,

Hosni²,

Hamzaoui³

2020

Smart Nanosystems for Biomedicine, Optoelectronics and Catalysis

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“…The magnetic entropy change calculated by utilizing the isothermal magnetization data, shown in Fig. 4 , and which is initiated by the changing the applied magnetic field from 0 to H is determined by applying the well-known Maxwell thermodynamic correlation, which is given by the equation 34 , where, ΔS is the magnetic entropy change, dH is the change in the applied magnetic field, M is the magnetization and T is the temperature.…”

Section: Resultsmentioning

confidence: 99%

Structural, magnetic, and magnetocaloric properties of R2NiMnO6 (R = Eu, Gd, Tb)

Shinde

Lee

Manawan

et al. 2021

Sci Rep

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The crystal structure, cryogenic magnetic properties, and magnetocaloric performance of double perovskite Eu2NiMnO6 (ENMO), Gd2NiMnO6 (GNMO), and Tb2NiMnO6 (TNMO) ceramic powder samples synthesized by solid-state method have been investigated. X-ray diffraction structural investigation reveal that all compounds crystallize in the monoclinic structure with a P21/n space group. A ferromagnetic to paramagnetic (FM-PM) second-order phase transition occurred in ENMO, GNMO, and TNMO at 143, 130, and 112 K, respectively. Maximum magnetic entropy changes and relative cooling power with a 5 T applied magnetic field are determined to be 3.2, 3.8, 3.5 J/kgK and 150, 182, 176 J/kg for the investigated samples, respectively. The change in structural, magnetic, and magnetocaloric effect attributed to the superexchange mechanism of Ni2+–O–Mn3+ and Ni2+–O–Mn4+. The various atomic sizes of Eu, Gd, and Tb affect the ratio of Mn4+/Mn3+, which is responsible for the considerable change in properties of double perovskite.

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“…Conversely, the temperature decreases when the magnetic field is removed. The warming and cooling process resulting from the application and removal of an external magnetic field is called the magnetocaloric effect (MCE) [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, their technological potential spans a wide range of applications [11][12][13][14]. Among these compounds, the manganites and cobaltates show colossal magnetoresistance [1][2][3][4]15] and MCEs [16][17][18]. Magnetic refrigeration uses the MCE in these materials to attain a decrease https://doi.org/10.1016/j.jmmm.2018.02.087 0304-8853/Ó 2018 Elsevier B.V. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Magnetocaloric effect, electric, and dielectric properties of Nd0.6Sr0.4MnxCo1−xO3 composites

Abdel-Latif

Ahmed

Mohamed

et al. 2018

Journal of Magnetism and Magnetic Materials

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The magnetocaloric effect (MCE) and electric-dielectric properties of the Nd-cobaltate perovskites Nd 0.6 Sr 0.4 Co 1Àx Mn x O 3 (x = 0, 0.3, 0.7 and 1) were investigated for possible use in magnetic cooling applications. Upon Mn substitution, the magnetic exchange interaction is affected by the (Mn 4+ /Mn 3+) ratio, which in turn impacts several physical properties. The XRD patterns of the synthesized composites revealed a single phase with an orthorhombic structure with space group Pbnm (62). The orthorhombic lattice distortion increases linearly with the Mn content, reaching a maximum value (D = 7.377 Â 10 À3) for Nd 0.6 Sr 0.4 MnO 3. The temperature and frequency dependence of the dielectric permittivity was studied and analyzed using Maxwell-Wagner interfacial polarization and Koops phenomenological theory. The rapid increase in magnetic susceptibility around the paramagnetic (PM)-ferromagnetic (FM) transition temperature T C is greatly affected by Mn substitution. The decrease in susceptibility with increasing temperature can be attributed to a charge ordering effect. The PM-FM transition occurs in the temperature range of 150-200 K. Moreover, the presence of spontaneous magnetization with second-order phase transitions is observed from Arrott plot isotherms. The MCE was also investigated by determining DS M and the relative cooling power (RCP), and the maximum value is found for Nd 0.6 Sr 0.4 Co 0.3 Mn 0.7 O 3. These results compare favorably with those reported for similar materials, indicating our materials as a possible candidate for use in magnetocaloric refrigerators.

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Influence of La addition on the structural, magnetic and magnetocaloric properties in Sr 2−x La x FeMoO 6 (0≤ x ≤0.3) double perovskite

Cited by 50 publications

References 26 publications

Synthesis and ESR Study of Transition from Ferromagnetism to Superparamagnetism in La_0.8Sr_0.2MnO₃ Nanomanganite

Synthesis and ESR Study of Transition from Ferromagnetism to Superparamagnetism in La_0.8Sr_0.2MnO₃ Nanomanganite

Structural, magnetic, and magnetocaloric properties of R2NiMnO6 (R = Eu, Gd, Tb)

Magnetocaloric effect, electric, and dielectric properties of Nd0.6Sr0.4MnxCo1−xO3 composites

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Influence of La addition on the structural, magnetic and magnetocaloric properties in Sr 2−x La x FeMoO 6 (0≤ x ≤0.3) double perovskite

Cited by 50 publications

References 26 publications

Synthesis and ESR Study of Transition from Ferromagnetism to Superparamagnetism in La0.8Sr0.2MnO3 Nanomanganite

Synthesis and ESR Study of Transition from Ferromagnetism to Superparamagnetism in La0.8Sr0.2MnO3 Nanomanganite

Structural, magnetic, and magnetocaloric properties of R2NiMnO6 (R = Eu, Gd, Tb)

Magnetocaloric effect, electric, and dielectric properties of Nd0.6Sr0.4MnxCo1−xO3 composites

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Synthesis and ESR Study of Transition from Ferromagnetism to Superparamagnetism in La_0.8Sr_0.2MnO₃ Nanomanganite

Synthesis and ESR Study of Transition from Ferromagnetism to Superparamagnetism in La_0.8Sr_0.2MnO₃ Nanomanganite