HIGH-FREQUENCY ELECTROMAGNETIC PROPERTIES OF BOROSILICATE GLASSESWITH ADDITIVES OF La2O3, TiO2, ZrO2

The results of studies high-frequency electromagnetic properties alkaline borosilicate glasses modified with lanthanum, titanium, and zirconium oxides concerning their structure are presented. values the spectral reflection transmission coefficients experimentally measured in frequency range 12–18 GHz. article presents typical spectra complex dielectric constant studied glass samples inthe 20 Hz–1 MHz, according to which both real imaginary parts decrease increasing frequency, while part decreases much faster. It is shown that can be used as a vacuum-tight base low losses development devices operating microwave range. influence chemical composition experimental on value permittivity ranges Hz –1 MHz GHzis established. was by Raman spectroscopy. degree polymerization structural framework revealed. presence La2O3in sodium causes polymeriza-tion borosilicon-oxygen entire introduced concentrations since La2O3is octahedral position acts modifier structure. intro-ductionof oxide into has more significant effect depolymerization than addition lanthanum oxide. most serious changes observed when TiO2is compositions such glasses, it glass–forming agent, forming motifs [TiO4], will combine silicon–oxygen component, Si–O–Ti type bridges.