Electrical, dielectric and optical properties of Sb2O3–PbCl2–MoO3 glasses

Abstract

Electrical, dielectric, and optical properties of lead molybdenum antimonoxychloride glasses, (90−x)Sb2O3–10PbCl2–xMoO3 (x ∈ {10,15,…35} mol%), are reported and discussed. DC conductivity is measured in the temperature range from −50°C up to 160°C. At higher temperatures, temperature dependences of the dc conductivity are Arrhenius-like with conduction activation energies equal to 1.00±0.06eV. With increasing concentration of MoO3 the dc conductivity increases. At lower temperatures, the activation energy slightly decreases; this decrease is more pronounced at higher concentration of MoO3. It is probable that electron hopping between Mo5+ and Mo6+ contributes to the dc conductivity, at low temperature. Frequency dependences (100Hz to 100kHz) of ac conductivity and relative permittivity are measured at a constant temperature in the range (20–200°C). Modular analysis gives static relative permittivity ranging from 20.2 up to 24. Infrared spectra and UV–VIS spectra are measured. Strong extrinsic absorption bands in infrared region originate from hydroxyl groups, CO2 and Si–O vibrations. The slope of UV–VIS absorption edge edge decreases and the optical gap shifts to longer wavelengths with increasing MoO3 content.