Synthesis and Physical Properties of Sm Doped Pb Free 3 Phase-Glasses

Abstract

Glasses were prepared with compositions of <TEX>$(13-x)BaO-80B2_O_3-7Li_2O{\cdot}xSm_2O_3$</TEX>, 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 <TEX>$1350^{\circ}C$</TEX>. 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 <TEX>$Sm_2O_3$</TEX> concentration. The x-ray diffraction pattern showed that the crystallites in the BBLSx glasses after heat treatment at <TEX>$700^{\circ}C$</TEX> may be <TEX>$LiBaB_9O_{15}$</TEX>. From the DSC results, the glass transition temperatures(<TEX>$T_g$</TEX>), crystallization temperatures(<TEX>$T_c$</TEX>), and the maximum temperatures of the crystallized(<TEX>$T_p$</TEX>) BBLSx glasses all changed with the <TEX>$Sm_2O_3$</TEX> concentration. According to the dielectric spectroscopy results, the values of the real dielectric constant and Tan <TEX>${\delta}$</TEX> of the BBLSx glasses depended on the <TEX>$Sm_2O_3$</TEX> concentration. The values of the real dielectric constant and Tan <TEX>${\delta}$</TEX> were also shown to depend on the measuring temperature, possibly due to the ion migration in the bulk of the BBLSx glasses.