Structural and Magnetic Studies of Ca2−x Sm x MnO Compounds (x=0–0.4)

Issaoui, F.; Tlili, Mohamed; Bejar, M.; Dhahri, E.; Hlil, E.K.

doi:10.1007/s10948-011-1386-z

Cited by 13 publications

(10 citation statements)

References 29 publications

(34 reference statements)

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“…In fact, magnetization does not reach the saturation for x = 0.2 and x = 0.3. This confirms the presence of the AFM interactions, which are more important for higher Fe contents (x = 0.2 and x = 0.3) [27,28]. …”

Section: Magnetic Propertiessupporting

confidence: 76%

Fe doping effects on the structural, magnetic, and magnetocaloric properties of nano-sized Pr0.6Bi0.4Mn1−x Fe x O3 (0.1 ≤ x ≤ 0.3) manganites

et al. 2015

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The structural, magnetic, and magentocaloric properties are systematically investigated for Pr 0.6 Bi 0.4-Mn 1-x Fe x O 3 (0.1 B x B 0.3) manganites. The samples have been synthesized by sol-gel method. X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, and Fourier transform infrared spectroscopy were employed to investigate the crystalline structure. Magnetization measurements were used to investigate the magnetic properties. All the samples crystallize in the orthorhombic Pnma space group as expected for manganite compounds. The presence of a PrMn 2 O 5 compound is also evidenced by XRD. The average size of the manganite particles is about 50-60 nm. Particle characterizations at the atomic level turn to be of paramount importance. Magnetic measurements versus temperature under an applied magnetic field of 0.01 T show that all samples exhibit a paramagnetic-ferromagnetic transition. Temperature-dependent magnetization measurements and Arrott analysis reveal second-first order ferromagnetic transitions for (x = 0.1 and x = 0.2). The magnetic entropy change |DS M | was estimated using Maxwell relation method and is found to reach maximum values of 0.47 and 0.37 J/kg/K under an applied magnetic field of 5 T for x = 0.1 and x = 0.2, respectively.

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Section: Magnetic Propertiessupporting

confidence: 76%

Fe doping effects on the structural, magnetic, and magnetocaloric properties of nano-sized Pr0.6Bi0.4Mn1−x Fe x O3 (0.1 ≤ x ≤ 0.3) manganites

et al. 2015

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“…We note that the magnetization saturation values M Sat decrease with increasing Fe content, especially for x = 0.2. It is worth noting that similar results are reported in [19]. The difference between the measured and the calculated values should be explained by the presence of a magnetic inhomogeneity or by spin-canted state at low temperature.…”

Section: Magnetic Propertiessupporting

confidence: 84%

Magnetic and magnetocaloric properties of nano-sized La0.8Ca0.2Mn1−x Fe x O3 manganites prepared by sol–gel method

et al. 2015

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We present an investigation on magnetic and magnetocaloric properties of nano-sized La 0.8 Ca 0.2 Mn 1-xFe x O 3 (x = 0, 0.01, 0.15, 0.2) manganites synthesized by sol-gel process. X-ray diffraction and magnetization measurements were performed to investigate both crystallographic structure and magnetocaloric properties, respectively. All samples show an orthorhombic structure with Pnma space group. Ferromagnetic-paramagnetic transition sensitive to iron doping is observed at Curie temperature (T C ) ranging from 223 K (x = 0) to 70 K (x = 0.2). In addition, a large magnetocaloric effect near T C is observed. Under a magnetic field change of 5 T, a maximum of magnetic entropy DS The large values of entropy changes and related RCP allow concluding that our material could be a highly attractive candidate for magnetic refrigeration.

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“…The powder exhibits a ferromagnetic behavior at 5 K. The magnetization does not reach the saturation for x = 0.2. This confirms the presence of AFM interactions, which are more important for higher Fe contents (x = 0.2) [30][31][32]. The values of the saturation magnetizations were calculated considering the total spins of Mn 3+ , Mn 4+ , Fe 3+ , and Pr 3+ ions …”

Section: Magnetic Propertiessupporting

confidence: 52%

Magnetic and Magnetocaloric Properties of Pr0.8Bi0.2Fe x Mn1−x O3 Compounds with 0 ≤ x ≤ 0.3

Sbissi

Kahn

Ellouze

et al. 2015

J Supercond Nov Magn

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This paper studies the effects of the Mn site substitution by Fe on the magnetic properties and the magnetocaloric properties of Pr 0.8 Bi 0.2 Fe x Mn 1−x O 3 elaborated by a sol-gel method. The variation of the magnetization as a function of temperature and applied magnetic field was carried out. Magnetic measurements show that all the materials exhibit a paramagnetic-ferromagnetic transition when the temperature decreases. The dependence of the Curie temperature (T C ) and the magnetic entropy change ( S M ) when varying the Fe doping content was investigated. The measured value of T C was 114, 97, 94, and 77 K for x = 0, 0.1, 0.2, and 0.3, respectively. The samples with x = 0 and x = 0.1 present a second-order phase transition, while the samples with x = 0.2 and x = 0.3 exhibit a firstorder phase transition. As the concentration of Fe increases, the maximum entropy change, S max M , decreases gradually, from 2.77 J kg −1 K −1 (x = 0) to 1.05 J kg −1 K −1 (x = 0.3), when the magnetic field changes from 0 to 5 T.

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Structural and Magnetic Studies of Ca2−x Sm x MnO Compounds (x=0–0.4)

Cited by 13 publications

References 29 publications

Fe doping effects on the structural, magnetic, and magnetocaloric properties of nano-sized Pr0.6Bi0.4Mn1−x Fe x O3 (0.1 ≤ x ≤ 0.3) manganites

Fe doping effects on the structural, magnetic, and magnetocaloric properties of nano-sized Pr0.6Bi0.4Mn1−x Fe x O3 (0.1 ≤ x ≤ 0.3) manganites

Magnetic and magnetocaloric properties of nano-sized La0.8Ca0.2Mn1−x Fe x O3 manganites prepared by sol–gel method

Magnetic and Magnetocaloric Properties of Pr0.8Bi0.2Fe x Mn1−x O3 Compounds with 0 ≤ x ≤ 0.3

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