Effects of Y2O3 on structure and dielectric properties of aluminoborosilicate glasses

Abstract

Aluminoborosilicate glasses with different contents of Y2O3 were prepared by the conventional melt-annealing method. Fourier-transform infrared spectroscopy (FT-IR), differential thermal analysis (DTA) and impedance instrument were used to investigate structure, thermal and dielectric properties of glass samples. The infrared spectrum analysis showed that the structure of aluminoborosilicate glasses became compact firstly and then loss with the increase of Y2O3. Oxygen molar volume (VO) and molar volume (Vm) of the glass samples reached the minimum with 2 mol% Y2O3 addition, which indicated this sample had the more compact and dense glass network structure. The glass transition temperature (Tg), onset glass crystallization temperature (Tc) and crystallization peak temperature (Tp) had an upward trend with the addition of Y2O3. When Y2O3 content was 2.0 mol%, the maximum value of Dietzel's thermal stability (∆T) and the Saad parameter (S) were 161 °C and 15.58 °C respectively. This meant that the thermal stability was enhanced by adding Y2O3, and the sample contained 2.0 mol% Y2O3 had excellent thermal stability. The dielectric constant decreased to the minimum value (4.7) with the addition of 1.5 mol% Y2O3, and the dielectric loss met the minimum (3.8 × 10−4) when the content of Y2O3 reached 2.0 mol%.