International Journal of Science, Engineering and TechnologyAuthors: Kwang Myong Choea, Jong Sung Paka, Myong Hyok Kima
Abstract: In this paper, we prepared Mg-doped sodium superionic conductors Na3.2+2xMgxZr2-xSi2.2P0.8O12 (x=0, 0.025, 0.05, 0.075, 0.1) by solid state synthesis and investigated the effect of microwave sintering on their ionic conductivity. Sintering was carried out at 1 100 °C for 1 h using a 2.45 GHz microwave sintering furnace, and the phase composition, microstructure, density and ionic conductivity were compared with those of the samples sintered at 1250 °C for 5 h in conventional sintering method. XRD analysis showed that the main phase in microwave sintered samples was a monoclinic C2/c NASICON phase for x≤0.05, and a rhombohedral crystalline R3c NASICON phase for x>0.05. There also existed a secondary phase, the Mg-doped Na3PO4 phase, though weak. The maximum ionic conductivity at room temperature for microwave sintered samples was found to be 3.86 mS cm-1 for the sample with a composition of Na3.3Mg0.05Zr1.95Si2.2P0.8O12, which was improved by about 37% compared to the maximum ionic conductivity of 2.82 mS·cm-1 for the sample with a composition of Na3.35Mg0.075Zr1.925Si2.2P0.8O12 in the conventional sintering mode.
DOI: https://doi.org/10.5281/zenodo.17640216
