Effect of B-doping on the structural, magnetotransport and magnetocaloric properties of La0.67Ca0.33MnO3 compounds

Kolat, V. S.; Gencer, H.; Gunes, M.; Atalay, S.

doi:10.1016/j.mseb.2007.05.002

Cited by 84 publications

(26 citation statements)

References 34 publications

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“…The absorption bands in the 4000-1000 cm -1 range are characteristic of -OH, C=O, N-H, and CH 3 functional organic groups, while the region between 1000 and 400 cm -1 is the fingerprint of the inorganic material. The observed broad bands at 3400 and 2320 cm -1 can be attributed to the O-H stretching vibration of water molecules [12][13][14]. The bands at 1500 and 1066 cm -1 are ascribed to the stretching vibrations of the aliphatic CH 3 groups [15].…”

Section: Ftir Spectroscopic Investigationsmentioning

confidence: 99%

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: Ftir Spectroscopic Investigationsmentioning

confidence: 99%

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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“…2b, the isothermal magnetization curves display a very small hysteresis and the very low coercive elds at 5 K which con rms the very soft ferromagnetic behavior of the samples consisting of basically antiferromagnetic with a weak ferromagnetism as in the case of spin-glass systems. However, the maximum magnetization values observed at 7 T magnetic eld and at 5 K are signi cantly lower than that of same La 0.67 Ca 0.33 MnO 3 samples prepared by other conventional methods [4,5].…”

Section: Methodsmentioning

confidence: 61%

“…On the other hand, a signi cant decrease in the value of ∆S m was observed. The maximum entropy change for 12 h milled sample is only 0.3 J/(kg K) at 6 T magnetic eld which is very much smaller than that of the same polycrystalline La 0.67 Ca 0.33 MnO 3 samples prepared by other conventional methods [4,5]. A reduction in value of ∆S m accompanied by a broadening of ∆S m peak is a characteristic feature observed for manganites when particle size decreased [9,10].…”

Section: Methodsmentioning

confidence: 99%

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Production of LaCaMnO₃Composite by Ball Milling

et al. 2014

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La0.67Ca0.33MnO3 perovskite-type manganite was synthesized by high-energy ball milling raw oxides of La2O3 (purity 99.9%), CaCO3 (purity > 99%), and MnO (purity > 99%). The ratio of ball and powder weight was 10:1 and the rotating speed was set to 500 rpm. X-ray analysis indicated that La0.67Ca0.33MnO3 single phase was formed completely when milling time is up to 4 h. The peak intensity of perovskite structure decreased and a hump-like peak appeared with further milling time. When the milling time is longer than 40 h, the perovskite structure disappeared and the amorphous phase was formed completely. Scanning electron microscopy picture of 24 h milled sample showed that the particle size generally varies in a broad range from nanometer scale to a few µm. The magnetic measurements showed that ball milling samples have an inhomogeneous magnetic state and exhibit spin-glass like behavior. The signi cantly small magnetic entropy change and a remarkably broad temperature interval in entropy change were attributed to high degree of structural and magnetic disorder and broadening of magnetic transition.

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“…Recently, a series of doped lanthanum-manganese oxides have been the object of extensive research due to the exotic physics and possible potential spintronic applications [1][2][3]. More recently, an interesting property has been found in the ferromagnetic manganites near the Curie temperature, the magnetocaloric effect (MCE) [4,5].…”

Section: Introductionmentioning

confidence: 99%

Large Magnetic Entropy Change in La_0.55Ce_0.2Ca_0.25MnO₃Perovskite

Anwar¹,

Kumar²,

Arshi³

et al. 2011

Journal of Magnetics

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In this paper, magnetic property and magnetocaloric effect (MCE) in perovskite manganites of the type La (0.75-X) Ce X Ca 0.25 MnO 3 (x = 0.0, 0.2, 0.3 and 0.5) synthesized by using the standard solid state reaction method have been reported. From the magnetic measurements as a function of temperature and applied magnetic field, we have observed that the Curie temperature (T C ) of the prepared samples strongly dependent on Ce content and was found to be 255, 213 and 150 K for x = 0.0, 0.2 and 0.3, respectively. A large magnetocaloric effect in vicinity of T C has been observed with a maximum magnetic entropy change (|ΔS M | max ) of 3.31 and 6.40 J/kgK at 1.5 and 4 T, respectively, for La 0.55 Ce 0.2 Ca 0.25 MnO 3 . In addition, relative cooling power (RCP) of the sample under the magnetic field variation of 1.5 T reaches 59 J/kg. These results suggest that La 0.55 Ce 0.2 Ca 0.25 MnO 3 compound could be a suitable candidate as working substance in magnetic refrigeration at 213 K.

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Effect of B-doping on the structural, magnetotransport and magnetocaloric properties of La0.67Ca0.33MnO3 compounds

Cited by 84 publications

References 34 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

Production of LaCaMnO₃Composite by Ball Milling

Large Magnetic Entropy Change in La_0.55Ce_0.2Ca_0.25MnO₃Perovskite

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Effect of B-doping on the structural, magnetotransport and magnetocaloric properties of La0.67Ca0.33MnO3 compounds

Cited by 84 publications

References 34 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

Production of LaCaMnO3Composite by Ball Milling

Large Magnetic Entropy Change in La0.55Ce0.2Ca0.25MnO3Perovskite

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Production of LaCaMnO₃Composite by Ball Milling

Large Magnetic Entropy Change in La_0.55Ce_0.2Ca_0.25MnO₃Perovskite