Characterization of zinc lead-borate glasses doped with Fe 3+ ions: optical, dielectric, and ac-conductivity investigati
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Characterization of zinc lead-borate glasses doped with Fe3+ ions: optical, dielectric, and ac-conductivity investigations A. S. Abouhaswa1,2,*
, Y. S. Rammah1, and Gamal M. Turky3
1
Physics Department, Faculty of Science, Menoufia University, Shebin El-Koom, Menoufia 32511, Egypt Institute of Natural Science and Mathematics, Ural Federal University, Ekaterinburg, Russia 620002 3 Department of Microwave Physics & Dielectrics, National Research Centre, 33 El-Bohouth St., Dokki, Giza 12622, Egypt 2
Received: 4 May 2020
ABSTRACT
Accepted: 14 August 2020
The optical, dielectric response, and ac-conductivity properties for six glasses of zinc lead-borate doped with different contents of Fe3? (Fe2O3 = 0 to 10 wt%) have been investigated. UV–Vis spectra in 190–1100 nm wavelength have been carried out. Band gaps for optical energy (EOptical), Urbach’s energy (EU), index of refraction (n), steepness parameter (S), energy dispersion parameter of refractive index (Ed), single-oscillator energy (Eo), the dispersion refractive index (no), minimum reflectance wavelength (ko), and oscillator strength (So) 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 EU values change from 0.232 to 0.966 eV for glasses with Fe2O3 = 0 and 10 wt%, respectively. Also, S and ko decrease with the enhancement of Fe2O3 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 Fe2O3. 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.
Springer Science+Business
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1 Introduction In the last decades, glass materials based on boron oxide (B2O3) have gained more attention from several researchers and investigators, due to their unique
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https://doi.org/10.1007/s10854-020-04262-1
interesting physical and chemical characteristics such as good transparency, high transmittance, high chemical durability, low melting temperature, and high thermal stability. These properties lead the borate glasses to be applied in several applications as
J Mater Sci: Mater Electron
luminescent materials, thermal and mechanical sensors, and as layers for both the opto-electronic and optical devices [1–5]. Introducing lead oxide (PbO) into borate glass systems helps to enhance the optical nonlinearity owing to high polarizability of Pb2? ions in glass networks [6]. On the other hand, association of PbO and B2O3 in the glass matrix plays double effect in the glass network: acts as glass former in the case of high boron oxide or acts as
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