Electrical Property of the Li 2 O-2SiO 2 Glass Sintered by Spark Plasma Sintering
A () glass was investigated as a lithium-ion conducting oxide glass, which is applicable to a fast ionic conductor even at low temperature due to its high mechanical strength and chemical stability. The glass is likely to be broken into small pieces when quenched; thus, it is difficult to fabricate a specifically sized sample. The production of properly sized glass samples is necessary for device applications. In this study, we applied spark plasma sintering (SPS) to fabricate glass samples which have a particular size as well as high transparency. The sintered samples, in size, (-s) were produced by SPS between and at 45MPa for 3~5mim, after which the thermal and dielectric properties of the -s samples were compared with those of quenched glass (-q) samples. Thermal behavior, crystalline structure, and electrical conductivity of both samples were analyzed by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and an impedance/gain-phase analyzer, respectively. The results showed that the -s had an amorphous structure, like the -q sample, and that both samples took on the lithium disilicate structure after the heat treatment at . We observed similar dielectric peaks in both of the samples between room temperature and . The DC activation energies of the -q and -s samples were and , while the AC activation energies were and , respectively.