Glasses were prepared with compositions of (13-x)BaO-80B2O3-7Li2O·xSm2O3, BBLSx(x=0.5, 0.4, 0.3) by melting the starting materials of boron oxide(99.9%), lithium oxide(99.9%), barium carbon oxide(99.9%), and samarium oxide(99.9%) and then quenching the melt at 1350˚C. This led to good-quality BBLSx(x=0.4, 0.3) and poor-quality BBLSx(x=0.5) glasses. The physical and structural properties of the BBLSx glasses were studied by means x-ray diffraction, scanning electron microscopy(SEM), differential scanning calorimetry(DSC), and dielectric spectroscopy. From the x-ray diffraction and SEM results, the quality of the BBLSx glasses significantly depends on the Sm2O3 concentration. The x-ray diffraction pattern showed that the crystallites in the BBLSx glasses after heat treatment at 700˚C may be LiBaB9O15. From the DSC results, the glass transition temperatures(Tg), crystallization temperatures(Tc), and the maximum temperatures of the crystallized(Tp) BBLSx glasses all changed with the Sm2O3 concentration. According to the dielectric spectroscopy results, the values of the real dielectric constant and Tan δ of the BBLSx glasses depended on the Sm2O3 concentration. The values of the real dielectric constant and Tan δ were also shown to depend on the measuring temperature, possibly due to the ion migration in the bulk of the BBLSx glasses.

• 박종호 | Park, Jong-Ho