科研之友
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摘要
Considerable efforts have been exerted on the controllable synthesis of nanomagnetic materials due to their size-and morphology-dependent properties. Herein, a facile ethylene glycol in situ reduction strategy has been successfully employed in the preparation of CoCr2O4 nanosheets. X-ray diffraction patterns showed that the products have the cubic spinel structure. The electron microscopy analysis revealed that the obtained CoCr2O4 nanosheets consisted of nanoparticles with the diameters of 20-30 nm. Experiments proved that the volume ratio of ethylene glycol to water was crucial for the final morphology. The magnetization studies demonstrated that besides the long-range ferrimagnetic order below the Curie temperature (T-C = 86 K), the sample exhibited two low-symmetry ordered states including the spiral magnetic order at T-S = 20 K and the magnetic lock-in transition at T-L = 13 K. The crystallinity- and size-dependent magnetic properties were also investigated. The temperature dependence of the specific heat revealed both phase transition at T-C = 90 K and T-S = 20 K, in line with the magnetic results.
