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通过水热法采用Ni(N03)2·6H2O和FeCl3·6H2O合成纳米NiFe2O4粉体。利用X射线衍射(XRD)、扫描电镜(SEM)对样品进行表征。结果表明,不同PEG和反应温度对合成纳米NiFe2O4粉体有影响。通过扫描电镜分析,不加PEG、加PEG-400和PEG-2 000对近似于球体颗粒粒度大小有影响,而加入PEG-20000,纳米NiFe2O4粉体形状变成了纳米线,均匀分布;不同反应时间对合成纳米NiFe2O4粉体没有明显的影响;而不同反应温度对合成纳米NiFe2O4粉体形状有影响,其影响是从纳米线变化到出现少量颗粒与纳米线混合,再到大量球形颗粒混合纳米线。水热过程是溶解再结晶的过程,部分晶体经高温后结晶成颗粒。
Nano-NiFe2O4 powder was synthesized by hydrothermal method using Ni (N03) 2 · 6H2O and FeCl3 · 6H2O. The samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that different PEG and reaction temperature had an influence on the synthesis of nano-sized NiFe2O4 powders. Scanning electron microscopy analysis showed that PEG-400 and PEG-2000 did not affect the particle size of the spherulites without addition of PEG, while PEG-20000 and nano-NiFe2O4 powders changed into nanowires with uniform distribution. Different reactions Time has no obvious effect on the synthesis of nano-sized NiFe2O4 powders; however, the influence of different reaction temperatures on the shape of the synthesized nano-sized NiFe2O4 powders is affected by the change from nanowires to the combination of a small amount of particles and nanowires, . Hydrothermal process is dissolved and recrystallized, part of the crystal after high temperature crystallization into particles.