Journal
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
Volume 32, Issue 4, Pages 993-999Publisher
SPRINGER
DOI: 10.1007/s10948-018-4782-9
Keywords
Manganite; Spark plasma sintering; Magnetocaloric effect; Landau theory
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Funding
- National Natural Science Foundation of China [11564030, 11547032, 51571126]
- Natural Science Foundation of Inner Mongolia [2017MS0110]
- Innovation Fund of Inner Mongolia University of Science and Technology [2016YQL02]
- Research Program of Science and Technology at Universities of Inner Mongolia Autonomous Region [NJYT-18-B07]
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The La0.67Ca0.20Sr0.13MnO3 nanoparticles and bulks were prepared by using sol-gel method (SGM) and spark plasma sintering (SPS), respectively. The X-ray diffraction analysis indicates each sample crystal in a single rhombohedral perovskite structure (space group R3c). The Curie temperature is slightly improved and the phase transition is sharpened after processing with SPS. The enhancement of magnetocaloric effect (MCE) is also observed in the samples prepared by SPS. For a field change of 3 T, the maximum isothermal entropy change is improved by 32 and 117% when different sintering temperatures and sintering pressures are applied. The magnetic phase transition and MCE can be well described by the Landau theory. The present studies suggest that the perovskite bulks prepared by SPS could be useful for the application of magnetic refrigeration.
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