Investigation of some dielectric properties of phosphate glasses doped with iron oxides, by a microwave technique

Abstract

The effects of iron ions on dielectric properties of lithium sodium phosphate glasses were studied by non-usual, fast and non-destructive microwave techniques. The dielectric constant (e0), insertion loss (L) and microwave absorption spectra (microwave response) of the selected glass system xFe2O3(1 x)(50P2O525Li2O25Na2O), being x =0, 3, 6,...,15 expressed in mol.%, were investigated. The dielectric constant of the samples was investigated at 9.00 GHz using the shorted-line method (SLM) giving the minimum value of e0 = 2.10 ± 0.02 at room temperature, and increasing further with x, following a given law. It was observed a gradual increasing slope of e in the temperature range of 25 6t6330 C, at the frequency of 9.00GHz. Insertion loss (measured at 9.00 GHz) and measurements of microwave energy attenuation, at frequencies ranging from 8.00 to 12.00 GHz were also studied as a function of iron content in the glass samples.