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Effect of Li doping on the magnetic and magnetocaloric properties of Pr0.5Sr0.5−xLixMnO3 (0≤x≤0.3)
- Source :
- Journal of Magnetism and Magnetic Materials. 334:16-20
- Publication Year :
- 2013
- Publisher :
- Elsevier BV, 2013.
-
Abstract
- The magnetic properties and magnetocaloric effect have been studied in Pr0.5Sr0.5−xLixMnO3 (0≤x≤0.3) prepared by conventional solid-state reaction. Magnetic measurements versus temperature revealed that the Curie temperature (TC) increased gradually with increasing lithium content (0.05≤x≤0.2); TC values are about 260 and 290 K for x=0.05 and 0.2, respectively. But it shows abrupt drop in TC value for x=0.3 (TC=235 K). Meanwhile, the paramagnetic–ferromagnetic (PM–FM) transition is second-order in x≤0.2, it changes into first order for x=0.3. However, the magnitude of the isothermal magnetic entropy (ΔSM) increased gradually. In a magnetic field change of 15.0 kOe, the maximum ΔSM achieved around TC are −1.03, −1.05, −1.48, −2.17 and −2.64 J kg−1 K−1 for x=0, 0.05, 0.1, 0.2and 0.3, respectively. Although ΔSM for x=0.2 is smaller compared to the composition x=0.3, the relative cooling capacity (RCP) 59.6 J kg−1 is similar compared with the value 59.8 J kg−1 for x=0.3. Addition of suitable TC makes it a desirable material for room temperature magnetic refrigeration.
Details
- ISSN :
- 03048853
- Volume :
- 334
- Database :
- OpenAIRE
- Journal :
- Journal of Magnetism and Magnetic Materials
- Accession number :
- edsair.doi...........c6421a00a4dc46908d21a7da92a7e72d