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ZnO-Fe3O4 composite prepared by sol-gel method with H-2 deoxidation

机译:H-2脱氧溶胶-凝胶法制备ZnO-Fe3O4复合材料

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Fe doped ZnO powder samples (Fe/Zn = 0.05 and 0.1) were prepared by sol-gel method with H-2 deoxidation at 450 degrees C for several hours or just heated in air at the same temperature. It was showed by vibrating sample magnetometer (VSM) that samples heat treated in H-2 could show strong ferromagnetism at room temperature while samples treated in air only show very weak magnetism. XRD using Co ka X-ray revealed that the samples heated in H-2 were not pure phase but like a granular system and the magnetism mainly results from Fe3O4 in samples while samples heated in air showed pure ZnO phase. Our work indicated that H-2 deoxidation treatment may be an effective technique to fabricate such magnetic semiconductor-like materials with Curie temperature higher than room temperature. (c) 2006 Elsevier Ltd. All rights reserved.
机译:通过溶胶-凝胶法在450℃下H-2脱氧数小时或在相同温度下在空气中加热,制备了掺铁的ZnO粉末样品(Fe / Zn = 0.05和0.1)。通过振动样品磁力计(VSM)表明,在H-2热处理的样品在室温下可能显示强铁磁性,而在空气中处理的样品仅显示非常弱的磁性。 X射线衍射(XRD)显示,在H-2中加热的样品不是纯相,而是颗粒状系统,磁性主要来自样品中的Fe3O4,而在空气中加热的样品显示为纯ZnO相。我们的工作表明,H-2脱氧处理可能是一种制造居里温度高于室温的磁性半导体材料的有效技术。 (c)2006 Elsevier Ltd.保留所有权利。

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