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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
engineering
Effect of Ni-doping on structural, magnetic and magnetocaloric properties of La
0.6
Pr
0.1
Ba
0.3
Mn
1-
x
Ni
x
O
3
nanocrystalline manganites synthesized by Pechini sol-gel method
Journal of Alloys and Compounds, Volume 615, Year 2014
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Description
The structural, magnetic and magnetocaloric properties of La 0.6Pr0.1Ba0.3Mn1-xNi xO3 (0 ≤ x ≤ 0.3) nanocrystalline manganites have been studied systematically. Samples were prepared using the Pechini sol-gel technique at 1223 K. Rietveld analysis of XRD shows the formation of pure crystalline phase with orthorhombic Pnma structure. Refinement results show that the unit cell volume and the average grain size decrease with increasing Ni content. An increase of the Ni content leads to the formation of a larger proportion of Mn4+ with respect to Mn3+. This reduces magnetization and the paramagnetic (PM)-ferromagnetic (FM) phase transition temperature (TC) from 215 K (for x = 0) to 131 K (for x = 0.3). The magnetocaloric effect has also been assessed by means of magnetic entropy change ΔSM which is basically determined from magnetic field dependences of magnetization at different temperatures M(H, T) near T C. Interestingly, the doping of a high amount of Ni in La 0.6Pr0.1Ba0.3Mn1-xNi xO3 nanocrystalline samples reduced the maximum magnetic entropy |ΔSMmax| from 1.97 J kg-1 K-1 (for x = 0) to 0.65 J kg-1 K-1 (for x = 0.3) for a field change ΔH = 5T. Respectively, the relative cooling power (RCP) decreases with increasing Ni content reaching 62 J kg-1 for x = 0.3 (ΔH = 5T). In order to study the nature of the PM-FM phase transition, a master curve behavior for the temperature dependence of ΔSM measured for different maximum fields is proposed. © 2014 Published by Elsevier B.V.
Authors & Co-Authors
Oumezzine, Elaa
Tunisia, Monastir
Université de Monastir
Hcini, Sobhi
Tunisia, Monastir
Université de Monastir
Hlil, E. K.
France, Grenoble
Institut Néel
Dhahri, Essebti
Tunisia, Sfax
Faculté Des Sciences de Sfax
Oumezzine, Mohamed
Tunisia, Monastir
Université de Monastir
Statistics
Citations: 92
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1016/j.jallcom.2014.07.001
ISSN:
09258388