Dielectric Constant, Metallization Criterion and Optical Properties of CuO Doped TeO2–B2O3 Glasses

Abstract

Copper oxide doped TeO 2 -B 2 O 3 glass system with empirical formula; [(B 2 O 3 ) 0.3 (TeO 2 ) 0.7 ] 1-x (CuO) x using the melt quenching method, where x = 0.0, 0.01, 0.015, 0.02, and 0.025 was combined. The glass samples' density and molar volume were measured, followed by characterizations using the UV-Vis, Fourier transform infrared (FTIR) and X-ray diffraction (XRD) spectroscopes. The amorphous or glassy nature of glass samples was proven by the XRD spectra except for the pure borotellurite sample which showed a peak around 2θ = 20 o , indicating α-TeO 2 crystalline phase presence. The FTIR spectral analysis suggested the presence of BO 3 , TeO 3 and TeO 4 as the structural functional units in the glass samples.The UV-Vis spectra showed no presence of any sharply de ned edges, a rming the amorphous or glassy nature of the glass materials. Physical parameters e.g. molar volume, density, oxygen packing density (OPD), inter ionic distance of Cu 2+ ions, concentration of copper ion per unit volume (N), as well as the polaron radius data were presented and discussed. Also, the direct bandgap (3.8900 to 3.5900 eV) , indirect bandgap (3.3200 to 3.0800 eV), refractive index (2.318 to 2.378), dielectric constant (5.3731 to 5.6549), optical dielectric constant (4.3731 to 4.6549), refractive index based metallization criterion (0.406885 to 0.391916) and the band gap based metallization criterion (0.407431 to 0.392428) were analysed and discussed. Based on the metallization criterion and values of refractive index, the glasses are good candidates for optoelectronic and laser applications. Meanwhile, the dielectric constants' values of the present glasses indicate their suitability bandpass lters and microelectronic substrates applications.

Structural, optical, and cytotoxicity studies of laser irradiated ZnO doped borate bioactive glasses

“…Both ZnO and CaO act to reduce the BO 4 /(BO 4 :BO 3 ) ratio and enhanced the glass network by increasing the number of non-bridging oxygen atoms 58 . In the glass structure, ZnO acts as a intermediate oxide either as network former or as network modifier 59 , where ZnO nanoparticles is a promising candidate as a modifier with a large band gap, allowing it to be used as a potential optical material 48 , 60 . As there was an unnoticeable change ZnO nanoparticles act as a modifier not as a former.…”