Impact of Gd ion substitution on the magneto-caloric effect of La0.6-xGdxSr0.4MnO3 (x = 0, 0.0125, 0.05, 0.10) manganites
Abstract
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.
- Publication:
-
Journal of Magnetism and Magnetic Materials
- Pub Date:
- April 2019
- DOI:
- 10.1016/j.jmmm.2018.11.131
- Bibcode:
- 2019JMMM..475..484E
- Keywords:
-
- Manganites;
- Ceramics;
- Gd substitution;
- Isothermal magnetization;
- Magneto-caloric effect