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A transferable tight-binding potential for nickel was used with molecular-dynamics methods and simulated-annealing techniques to study the structure properties of nickel clusters Nin (n≤55), The mean coordination number and structure of some clusters and their relative stability have been obtained. 相似文献
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The mean coordination numbers of some nickel clusters have been calculated for some proposed geometric structures for them, and their ionization potentials are obtained using an effective coordination-number model. It is shown that the mean effective-coordination number of all atoms of a cluster should be taken as a parameter to describe the d-band width of the cluster instead of mean effective coordination number of surface atoms. 相似文献
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快速电子验证相对论实验是近代物理实验中一个极其重要的实验,本对实验得到的能谱曲线中的两个峰作了详细分析,并证明该实验不仅可以用来验证相对论,也可以用来验证全同粒子的不可分辨性以及X射线特征谱线与入射电子能量无关,只与靶材料有关的理论。 相似文献
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用SEM(扫描电子显微镜)研究YBaCuO超导体及YBaCuO/YSZ 超导薄膜经质子辐照所引起的微结构变化,发现质子辐照可使超导晶粒变细、变密、分布较均匀,并在YSZ 衬底上发生趋向排列.这些都有利于超导电性的改善. 相似文献
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A transferable tight-binding potential for nickel together with molecular-dyna mics methods and simulated-annealing techniques have been used to study the str uctures and structural properties of nickel clusters.We have obtained the struct ures and their
关键词: 相似文献
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研究了外加磁场对滤纸上Zn分枝状电解沉积物生长形貌的影响.用金相显微镜和原子力显微镜观察Zn沉积物的显微结构.发现在非饱和浓度下生长的沉积物生长形貌受电解液浓度和滤纸纤维影响,外加磁场对其形貌的影响不明显.在饱和电解液浓度下获得的沉积物分枝分两层,并且贴近滤纸表面的薄层比其上面离滤纸较远的那一层生长快.在饱和浓度电解液情形下,0.40T外加磁场使得沉积物分枝发生明显的螺旋状偏转.在实验基础上结合相关理论,认为外加磁场通过霍尔效应影响滤纸上Zn分枝状电解沉积物形貌.
关键词:
电解沉积
磁场
霍尔效应
生长形态 相似文献