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Effect of thermal treatment on room-temperature ferromagnetism in Co-doped ZnO powders

机译:热处理对共掺杂ZnO粉末中室温铁磁性的影响

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摘要

The Co-doped ZnO powders were synthesized by sol–gel method, and treated at different temperatures (673–873 K) in the presence or absence of NH3 atmosphere for 0.5 and 2 h, respectively. X-ray diffraction (XRD) and vibrating sample magnetometer (VSM) show that better crystal structure can cause larger ferromagnetism and the second phase (Co3O4) is the reason for saturation magnetization decrease of the sample sintered at higher temperature in air. XPS and nuclear magnetic resonance (NMR) prove the existence of Co2+ ions in the Zn0.9Co0.1O and the absence of Co clusters, indicating intrinsic ferromagnetism of the samples treated in air. However, strong ferromagnetism of the samples annealed in NH3 is ascribed to cobalt nitride formed during annealing.
机译:通过溶胶-凝胶法合成了Co掺杂的ZnO粉末,并在存在或不存在NH3气氛下分别在不同温度(673-873 K)下处理了0.5 h和2 h。 X射线衍射(XRD)和振动样品磁强计(VSM)表明,较好的晶体结构可以引起较大的铁磁性,第二相(Co3O4)是在较高温度下在空气中烧结的样品饱和磁化强度降低的原因。 XPS和核磁共振(NMR)证明Zn0.9Co0.1O中存在Co2 +离子,而Co团簇不存在,表明在空气中处理过的样品具有固有的铁磁性。但是,在NH3中退火的样品的强铁磁性归因于退火过程中形成的氮化钴。

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