Calculation of the refractive index of silicate glasses from chemical composition
Calculation of the refractive index of silicate glasses from chemical composition
复制标题
从化学成分计算硅酸盐玻璃的折射率
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
W. M. Johnson
中科院分区：
文献类型：
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作者：
B. N. Church;W. M. Johnson
利用硅酸盐分析预测折射率，扩大了Mathews9弧融合法测定细粒火成岩的范围。这可以通过用一组主要氧化物的经验推导系数代替经典Larsen （Gladstone）方程中的比重因子来实现。这产生了新的方程，其中(n)是折射率，（n−1）是折射率，（W.F.）是存在的氧化物的质量分数。测试样品的（n−1）值的计算精确到±0.007，这与由于制备的玻璃中的不均匀性而在源处估计的误差大致相同。岩石玻璃的折射率是一种碱度的度量，它提供了一种将显微镜观察与化学成分联系起来的现成方法，以帮助分类、岩石学解释和火山或其他隐晶火成岩的制图。
The prediction of refractive index from silicate analyses increases the scope of Mathews9 arc fusion method for the determination of fine-grained igneous rocks. This is possible by replacing the specific gravity factor in the classical Larsen (Gladstone) equation by a set of empirically derived coefficients for the major oxides. This yields the new equation where ( n ) is the refractive index, ( n − 1) the refractivity, and (W.F.) the weight fraction of the oxides present. Calculations of ( n − 1) values for test samples are precise to ± 0.007 which is about the same as the estimated error at source due to in-homogeneities in the prepared glass. The refractive index of rock glass is a measure of basicity that provides a ready means of linking microscope observations with chemical composition to assist classification, petrological interpretation, and mapping of volcanic or other aphanitic igneous rocks.