Structure, thermal stability and dielectric properties of aluminoborosilicate glasses doped with Pr2O3

The structure, thermal stability and dielectric properties of aluminoborosilicate glasses with different contents of Pr2O3 were researched by XRD, FT-IR, DSC and electronic impedance analyzer. FT-IR results showed that the addition of Pr2O3 enhanced the degree of polymerization of glass network. The molar volume decreased at first and then increased, which reached the minimum value with the content of Pr2O3 up to 1.5 mol%. With the addition of Pr2O3 the glass transition temperature (Tg) showed an upward trend, while Dietzel's thermal stability (ΔT) and the Saad parameter (S) both increased initially to be followed by a decrease, which indicated that the thermal stability of glass can be improved by doping proper content of Pr2O3. The dielectric constant (er) and dielectric loss (tanα) both decreased at first then started to go up as the content of Pr2O3 increased. When Pr2O3 content moved up to 0.5 mol% and 1.5 mol%, the er and tanα reached the minimum values 4.68 and 3.13 × 10–4, respectively.