Effect of OH− on the low-frequency dielectric constant of vitreous silica

Publisher Website
Google Scholar
Abstract
The 1000‐Hz 300°K dielectric constant, εs, of 24 kinds of commercially available vitreous silica has been measured to an accuracy of 0.01% and a precision of about 1 part in 300 000 by the method of substitution (two‐fluid technique). The observed dielectric constant ranges from 3.8073 to 3.8304. These results are correlated with hydroxyl ion content and other imperfections. It is found that εs=3.8073+2.72×10−22 N where N is the hydroxyl concentration in ions/cm3, and observed deviations from this rule are attributed to metallic impurities and inclusions. From the results it appears that 3.8073 closely approximates the low‐frequency dielectric constant of pure vitreous silica.