Characterization of zinc lead-borate glasses doped with Fe3+ ions: optical, dielectric, and ac-conductivity investigations

Abstract

The optical, dielectric response, and ac-conductivity properties for six glasses of zinc lead-borate doped with different contents of Fe 3? (Fe 2 O 3 = 0 to 10 wt%) have been investigated. UV-Vis spectra in 190-1100 nm wavelength have been carried out. Band gaps for optical energy (E Optical ), Urbach's energy (E U ), index of refraction (n), steepness parameter (S), energy dispersion parameter of refractive index (E d ), single-oscillator energy (E o ), the dispersion refractive index (n o ), minimum reflectance wavelength (k o ), and oscillator strength (S o ) were evaluated. Results reveal that the indirect energy gap varies from 2.57 to 1.01 eV, while the direct energy gap takes values from 2.80 to 1.45 eV. The E U values change from 0.232 to 0.966 eV for glasses with Fe 2 O 3 = 0 and 10 wt%, respectively. Also, S and k o decrease with the enhancement of Fe 2 O 3 content. The dielectric response and ac-conductivity of the prepared glasses were investigated by broadband dielectric spectroscopy, BDS, in the frequency range from 0.1 Hz to 10 MHz and at temperatures ranging between 300 and 430 K. Two trends of activation plot have been observed in the conductivity of the samples with low content of Fe 2 O 3 . Although these samples show a perfect insulation features, they obey an anomalous behavior at higher temperatures. Therefore, the investigated glasses can be applied in several optical and optoelectronic devices.

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