Rare earth orthochromites; Magnetic properties; Magnetocaloric effect; Cooling product
Abstract :
[en] Polycrystalline phase of SmCrO3, NdCrO3, and LaCrO3 orthochromites was synthetized with solid-state reaction method. The pure orthorhombic phases with space group Pnma have been confirmed by X-ray diffraction. In addition, the FTIR spectroscopy proved the formation Sm--O, Nd--O, and La--O bonds in SmCrO3, NdCrO3, and LaCrO3 respectively, and Cr--O and Cr--O--Cr bonds in all our samples. The particles morphology and composition results were obtained using the scanning electron microscopy (SEM) and energy dispersive X-ray (EDX). The Quantum Design XL-SQUID magnetometer is used in order to determine the magnetic transition type and transition temperature for each sample. We found that our samples exhibit a transition at 195 K, 65 K, and 35 K for SmCrO3, NdCrO3, and LaCrO3 respectively. The magnetic entropy change (∆Sm), as the key parameter to evaluate the magnetocaloric effect, is calculated. Our samples present a ∆Sm in the range of 0.11 and 0.25 J kg−1 K−1 for an external magnetic field of 5 T.
Disciplines :
Chemistry
Author, co-author :
Fkhar, Lahcen
Mahmoud, Abdelfattah ; Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
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