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Precipitation of zinc ferrite nanoparticles in the Fe2O3-ZnO-SiO2 glass system

机译:Fe2O3-ZnO-SiO2玻璃体系中铁酸锌纳米粒子的沉淀

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Glass materials in the ZnO-Fe2O3-SiO2 System, containing zinc ferrite nanoparticles, were prepared by the sol-gel method and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Mossbauer spectroscopy, AC- and DC-magnetization techniques. The gel samples, dried at 130 degrees C, were further heat treated in air at 500 and 800 degrees C. At 500 degrees C zinc ferrite and hematite nanoparticles, with an average size of approximately 24 nm, were precipitated in the brown and opaque 10ZnO-10Fe(2)O(3)-80SiO(2) and in the ruby colored transparent 5ZnO-5Fe(2)O(3)-90SiO(2) and 2.5ZnO-2.5Fe(2)O(3)-95SiO(2) glss matrices. In the 5ZnO-5Fe(2)O(3)-9OSiO(2) sample the nanoparticles exhibited ferro or ferrimagnetic interactions combined with superparamagnetism with a blocking temperature of approximately 14 K. Heating at 800 degrees C seems to cause partial dissolution of the zinc ferrite and hematite particles in all the investigated compositions. Accordingly at 800 degrees C the 5ZnO-5Fe(2)O(3)-90SiO(2) glass shows a paramagnetic behavior down to 2 K. (C) 2007 Elsevier B.V. All rights reserved.
机译:ZnO-Fe2O3-SiO2系统中的玻璃材料含有铁酸锌纳米颗粒,采用溶胶-凝胶法制备,并通过X射线衍射(XRD),扫描电子显微镜(SEM),莫斯鲍尔光谱,交流电和直流电进行表征。磁化技术。将在130摄氏度下干燥的凝胶样品在500摄氏度和800摄氏度的空气中进一步热处理。在500摄氏度下,平均尺寸约为24 nm的铁酸锌和赤铁矿纳米颗粒沉淀在棕色不透明的10ZnO中-10Fe(2)O(3)-80SiO(2)和红宝石色透明5ZnO-5Fe(2)O(3)-90SiO(2)和2.5ZnO-2.5Fe(2)O(3)-95SiO (2)gl ass矩阵。在5ZnO-5Fe(2)O(3)-9OSiO(2)样品中,纳米粒子表现出铁磁或亚铁磁相互作用,并结合超顺磁性,阻断温度约为14K。在800摄氏度下加热似乎会导致锌的部分溶解所有研究成分中的铁素体和赤铁矿颗粒。相应地,在800摄氏度下5ZnO-5Fe(2)O(3)-90SiO(2)玻璃表现出的顺磁行为低至2 K.(C)2007 Elsevier B.V.保留所有权利。

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