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超级老快

木虫之王 (文学泰斗)

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当玻璃中PbO引入后,Pb2+电子层最外层两个未配对的6S电子,这两个未配对电子存在,使Pb2+离子极化率极高而且易被O2-极化,极化导致离子变形和离子间距缩短,从而不仅部分使Pb-O间距进一步缩短,而且场强增大,对O2-吸引力增强,使Al-O与Si-O键力减弱。
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超级老快: 金币+10, ★★★很有帮助 2015-08-27 15:49:27
After adding PbO to glass, due to the existence of two unpaired electrons in the outermost shell of the Pb2+ electron layer, the Pb2+ ion becomes polarized and absorbs the O2- anion easily.  Such polarization causes changes in the ions, shortening distances between ions, thus resulting not only in closing the distance between Pb and O ions, but also increases the force field.  This in turn causes O2- to increase attraction such that the bonds between Al and O, as well as Si and O to be weakened.
2楼2015-08-27 12:41:04
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