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OALib Journal期刊
ISSN: 2333-9721
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al2o3/nio包裹ni纳米颗粒的结构和磁性
Keywords: 复合材料,电弧法,纳米颗粒,磁性质,al2o3
Abstract:
？用电弧法蒸发ni-al合金(4%~5%al,质量分数),制备了al2o3nio包裹ni及ni-al合金纳米颗粒.高分辨电镜显示该纳米颗粒具有壳核结构,核为纳米ni及ni-al合金,壳为al2o3/nio复合氧化物.壳的厚度为2~4nm,颗粒的尺寸为5~60nm.壳核结构防止纳米ni颗粒的进一步氧化和团聚.饱和磁化强度为29.6am2/kg,矫顽力为4.13ka/m.由于铁磁和反铁磁性相界面处存在交换耦合作用,磁滞曲线出现小的偏置.
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