Impact of Gd ion substitution on the magneto-caloric effect of La0.6-xGdxSr0.4MnO3 (x = 0, 0.0125, 0.05, 0.10) manganites

•Magneto-caloric properties of manganite La0.6-xGdxSr0.4MnO3 (x = 0, 0.0125, 0.05, 0.10) was investigated.•Rietveld refinement analysis indicated that the gradual replacement of La with Gd effect.•Magnetization measurements as a function of temperature on all the samples showed a ferromagnetic trans...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2019-04, Vol.475, p.484-492
Main Authors: Ehsani, M.H., Raoufi, T., Razavi, F.S.
Format: Article
Language:English
Subjects:
Ceramics
Chemical composition
External pressure
Ferromagnetism
Gadolinium
Gd substitution
Isothermal magnetization
Magnetic properties
Magneto-caloric effect
Manganites
Organic chemistry
Refrigeration
Sol-gel processes
Transition temperature
X ray powder diffraction
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Summary:•Magneto-caloric properties of manganite La0.6-xGdxSr0.4MnO3 (x = 0, 0.0125, 0.05, 0.10) was investigated.•Rietveld refinement analysis indicated that the gradual replacement of La with Gd effect.•Magnetization measurements as a function of temperature on all the samples showed a ferromagnetic transition change.•Magneto-caloric parameters measurements suggested the samples for the magnetic refrigeration application. The effect of slight changes of the chemical composition on Magneto-caloric properties of manganite was investigated on a series of ceramic nano-particles of La0.6-xGdxSr0.4MnO3 (x = 0, 0.0125, 0.05, 0.10) where they synthesized using the Sol-gel method. The X-ray powder diffraction data and the Rietveld refinement analysis indicated that the gradual replacement of La with Gd reduced the cell volume acting in a comparable manner to applying external pressure. Similarly, the magnetization measurements as a function of temperature on all La0.6-xGdxSr0.4MnO3 samples showed a ferromagnetic transition, in which the transition temperature reduced as x increased. The calculated magnetic entropies of all samples of La0.6-xGdxSr0.4MnO3 as a function of temperature suggest a magneto-caloric effect similar to that of pure Gd. These results provide evidence that La0.6-xGdxSr0.4MnO3 compounds have a potential for magnetic refrigeration application.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2018.11.131