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The microscopic structure of certain molten-salt-liquid-metal solutions has been investigated by quantum chemical method. It is indicated that (ⅰ) Li_(n 1)~(n ) or Li_(n 2)~(n ) ions form in Li-LiF melt. The valence electrons of Li atoms delocalize into all vacant orbitals of neighboring cations; (ⅱ) lithium fluoride, dissolving in liquid lithium, forms F~- ions in liquid metal, and the vacant orbitals of Li~ ions of the salt take part in the delocalization with the electrons of metallic bond. It is this delocalizatin energy that makes this solution thermodynamically stable; (ⅲ) Mg_2~(2 ) is unstable as compared with Mg~ or Mg_2~ . The experimental results of mass-spectroscopy also indicate the existence of Mg~ abd Mg_2~ , but not Mg_2~(2 ). The state of Mg dissolving in molten salt is discussed based on the results mentioned above. 相似文献
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本文提出了一种用二次离子质谱(SIMS)测定Al_x Ga_(1-x)As薄膜样品成分的定量分析方法,通过对一组标样用线性回归法定标和迭代法定量计算,对不同能量下得到的数据进行统计分析表明,用SIMS方法测定的组份X值与用电子探针测定的结果之间的均方根误差只有8.7。本文还对影响SIMS定量分析精度的某些实验因素作了探讨。并给出了估算Al组分的I(Al~+)/sum from j=1 to nI(M_j~+)~C_(Al)图。原则上本法也同样适用于其它多组分均匀样品的SIMS定量分析。 相似文献
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