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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Abnormal refractivity trends in phosphate glass systems
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Abnormal refractivity trends in phosphate glass systems

机译：磷酸盐玻璃系统中的折射率异常趋势

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摘要

Phosphate glasses differ from silicate glasses in the manner in which glass basicity (measured as optical basicity, A) varies with increasing alkali or alkaline earth concentration. Whereas silicate glasses show a straightforward increase in A, in the Na_2O-P_2O_5 system, for example, there is almost no increase in A until the Na_2O content exceeds approximately 50 mol percent. This effect, previously observed by probe ion spectroscopy, is investigated here by studying trends in oxygen electronic polarisability (refr activity). These trends are explained by assuming that for phosphorus there are two basicity moderating parameters (y): for compositions more basic than metaphosphate y is 2-8, but for acidic glasses an additional y value of 2-1 must also be used owing to the presence of (-O-)3PO groups. Thus, the optical basicity of a glass in the range 0-50 percent basic oxide is calcu-lated from =(x/gamma M+5x/2-8+5(100-2x)/2-1)/(500-4x) and for >50 percent, A=(x/yM+5(100-x)/2-8)/(500-4x), where JM is the basicity moderating parameter of the basic oxide cation. The existence of these two j values provides scope for using refractivity data for structural investigations, this possibility is explored for the Al_2O_3-P_2O_5 and SiO_2-P_2O_5 systems.
机译：磷酸盐玻璃与硅酸盐玻璃的不同之处在于，玻璃碱度（以光学碱度A衡量）随碱或碱土金属浓度的增加而变化。硅酸盐玻璃显示出A的直接增加，例如在Na_2O-P_2O_5系统中，直到Na_2O含量超过大约50 mol％时，A几乎没有增加。通过研究氧电子极化率（refr活性）的趋势，可以对以前通过探针离子光谱法观察到的这种效应进行研究。通过假设磷有两个碱度调节参数（y）来解释这些趋势：对于比偏磷酸盐碱性更强的成分，y为2-8，但对于酸性玻璃，还必须使用2-1的y值。 （-O-）3PO基团的存在。因此，玻璃的光学碱度可从=（x /γM + 5x / 2-8 + 5（100-2x）/ 2-1）/（500- 4x）且> 50％时，A =（x / yM + 5（100-x）/ 2-8）/（500-4x），其中JM是碱性氧化物阳离子的碱度调节参数。这两个j值的存在为使用折射率数据进行结构研究提供了空间，对于Al_2O_3-P_2O_5和SiO_2-P_2O_5系统探索了这种可能性。

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