74 research outputs found
Extração de oleuropeína a partir de folhas de oliveira utilizando solvente hidroalcoólico
Suppression of Metamagnetic Transitions of Martensitic Type by Particle Size Reduction in Charge-Ordered La 0.5 Ca 0.5 MnO 3
Room temperature magnetocaloric effect in polycrystalline La0.75Bi0.05Sr0.2MnO3
In this work, we have investigated the magnetic and magnetocaloric properties of polycrystalline La0.75Bi0.05Sr0.2MnO3 prepared by sol–gel method. Structural analysis has shown that this compound crystallizes in the rhombohedral structure with R3¯c space group. The magnetic study revealed that our sample exhibits a ferromagnetic–paramagnetic transition at 300 K. A significant magnetocaloric effect in the vicinity of the room temperature was detected for this sample (for only 2T applied field, the maximum of magnetic entropy change |∆SMax| = 1.75 J/kg K and the relative cooling power RCP = 77.12 J/kg). The obtained results suggest the possibility of using this compound as a magnetic refrigerant
Sintering temperature effect on the magnetic properties of Pr0.67Sr0.33MnO3 manganite
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