Abstract
La10Si6O27 powder was synthesized by a high-energy ball milling method and its sintered body was prepared by spark plasma sintering (SPS) technology. Phase structure, microscopic morphology, density, porosity and oxide ion conductivity of La10Si6O27 were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Archimedes method and alternating current (AC) impedance spectrum, respectively. XRD results showed the ball-milled powder could form apatite-type La10Si6O27 at 1400 ℃. The crystal structure of La10Si6O27 sintered body remained stable. SEM results showed that La10Si6O27 sintered body using SPS sintering method had better sintering between grains and a large reduction in open pores compared to conventional sintering. Grains of the sintered body were clearly visible and the grain size was uniform, about 1 µm. Archimedes method analysis showed relative density of La10Si6O27 sintered body is 100%, and open porosity is 0. Electrical conductivity of La10Si6O27 sintered body has an Arrhenius relationship with temperature.
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