Glasses in the system x As2O3(1−x) SiO2 with 0.05<x<0.16 have been prepared by sol-gel route. They exhibit anomalously large dielectric permittivity in the temperature range 275 to 325 K. The permittivity values are found to be in the range 400–100 000 depending on the glass composition and the frequency of measurement. This effect is believed to arise due to a fairly large value of ratio [As5+]/[As3+] in these glasses and its drastic change as a function of temperature.
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Datta et al. (1991) studied this question.
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