Effects of CeO_2 additions on the structure and dielectric properties of aluminoborosilicate glasses

摘要

Glasses with compositions 15Al_2O_3-20B_2O_3-50SiO_2-5CaO-(10-x)MgO-xCeO_2 (x=0, 1, 2 and 3 mol %) were prepared by conventional melting method. Fourier-transform infrared spectroscopy (FTIR) indicated that the addition of CeO_2 converted trigonal boron (B) to tetrahedral boron (B). The glass transition temperatures (T_g) were determined using a differential scanning calorimetry (DSC). T_g increased with increasing CeO_2 content. Thus, the addition of CeO_2 instead of MgO strengthened the glass network. The dielectric constant ε_r and loss tanδ were measured for these glasses at 10~5 Hz. The decrease in ε_r and tanδ could be attributed to the increase in the rigidity of the glass network as the CeO_2 content increased.