Abstract
This work is aimed to shed light on the dielectric behavior of CuO containing glasses, since no publications concerning this issue have been presented before. Different glasses in the binary Na2O-B2O3 system were prepared by melt annealing technique. XRD spectra have shown that the amorphous structure is dominant in all glasses containing mixed concentrations from CuO and Na2O. The crystalline phases appeared only in glass free from Na2O. The dielectric spectroscopy is applied to shed some light on the conduction mechanisms in terms of changing both the dielectric constant and the electrical modulus of the investigated glasses. The ac conductivity increases with increasing frequency and decreases with increasing CuO concentration. Both the dielectric constant and dissipation loss is decreased with increasing frequency. Correlated barrier hopping (CBH) is considered an appropriate conduction mechanism results from the increase of frequency.
Highlights
Most of the studied borate glasses are known to have different properties such as good transparency, appropriate structure stability and higher electrical resistivity compared with the other types of glasses [1] [2]
The present study aims to shed some light on the structural role of CuO in different glasses
Sodium borate glasses containing CuO were successfully prepared via melt annealing-technique
Summary
Most of the studied borate glasses are known to have different properties such as good transparency, appropriate structure stability and higher electrical resistivity compared with the other types of glasses [1] [2]. Many of the previous studies are concentrated on the effect of both alkali and alkali earth oxides on the structure and properties of phosphate and borate glasses [2] This consideration may be due to the fact that alkali phosphate or borate glasses possess low melting temperature, low chemical durability, and high thermal expansion which are important in some specific applications such as sealing and soldering processes [3] [4]. A wide variety of technological applications is considered due to the improved both glass structure and properties Their high solubility for rare-earth or metal ions makes them very useful for laser glasses [8] [9]
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