Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 38, Pages 11982-11991Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta12281f
Keywords
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Funding
- National Natural Science Foundation of China [21001062, 51002073, 51162023]
- Research Fund for the Doctoral Program of Higher Education of China [20093601120010]
- Projects of the Jiangxi Science and Technology Pillar Program [2009BGA00600]
- Natural Science Foundation of Jiangxi Province [20132BAB216016]
- Foundation of Jiangxi Educational Committee [GJJ10032]
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Rare-earth orthochromites are extremely interesting because of their potential applications as multifunctional materials. However, it is still a great challenge for the general synthesis of nanostructured full rare-earth orthochromites series. Here, a facile and versatile solvothermal reduction strategy is successfully employed in the preparation of rare-earth chromites with quasi-hollow nanostructures. X-ray diffraction data show that all the products have the orthorhombic perovskite structure. The electron microscopy analysis reveals that the morphology of the product is seriously affected by the rare-earth ionic radius. Tube-like and vesicle-like structures can be formed for the larger and smaller rare-earth cationic radii, respectively. The experimental results suggest that the room-temperature precursors of potassium rare-earth chromates serve as a self-template for the in situ reduction and formation of rare-earth orthochromites hollow structures. The magnetization studies demonstrate that all the products, as it would be expected, undergo a magnetic transition from paramagnetic to antiferromagnetic phase at the Neel temperature (T-N1) attributed to Cr3+-Cr3+ exchange and this critical temperature goes up linearly with an increase in the rare-earth ionic radius. Additionally, some samples exhibit a variety of fancy magnetic properties, including thermal hysteresis suggesting a first-order magnetic transition, magnetization reversal due to the antiparallel polarization of the R3+ paramagnetic moments by the Cr3+ canted antiferromagnetic ones, and magnetic exchange bias related to the spin reorientation transition of the Cr3+ magnetic moments.
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