Tunable magnetocaloric effect in Sr1 − x Ca x Mn0.5Ti0.5O3 perovskites
| Autor: | Balan Palanivel, Ramaswamy Murugan, K. Shanmugapriya, D. Mohan Radheep |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Condensed matter physics 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Magnetization Crystallography Ferromagnetism Low magnetic field 0103 physical sciences Magnetic refrigeration Antiferromagnetism General Materials Science Crystallite 010306 general physics 0210 nano-technology Perovskite (structure) |
| Zdroj: | Applied Physics A. 123 |
| ISSN: | 1432-0630 0947-8396 |
| DOI: | 10.1007/s00339-017-1096-x |
| Popis: | Sr1 − x Ca x Mn0.5Ti0.5O3 (x = 0.25, 0.5 and 0.75) polycrystalline samples were synthesized by conventional solid-state reaction. Magnetic characterizations of Sr1 − x Ca x Mn0.5Ti0.5O3 revealed signature of antiferromagnetic ordering at temperatures (T N) ~19, 25 and 29.5 K for x = 0.25, x = 0.5 and for x = 0.75, respectively. Sr1 − x Ca x Mn0.5Ti0.5O3 (x = 0.75) exhibits field-induced antiferromagnetic to ferromagnetic transition at ~30 K with applied magnetic field of 4 and 5 T. Magnetocaloric change (ΔS M) increases from 3.5 to 19 J/kg K by increasing calcium concentration in the A-site. Those ΔS M values are relatively very high in these classes of antiferromagnetic perovskite systems and equal to the magnetisation values of the ferromagnetic perovskite manganites. This is the first report for the Sr1 − x Ca x Mn0.5Ti0.5O3 (x = 0.75) having large magnetic entropy changes induced by the low magnetic field. |
| Databáze: | OpenAIRE |
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