Preparation and Sintering Densification of Nanocrystalline NASICON Solid Material

Nanocrystalline solid material of NASICON (sodium super ionic conductor) was syn- thesized by the sol-gel and high-temperature sintering process, in which normal inorganic reagents and silicon organic reagent were used as the raw materials. The temperature range of 750～890℃ for the formation of NASICON phase was recognized through the analysis of TG-DTA result con- ducted for NASICON xerogel. Thus, the sintering process was carried out in the temperature range of 800～1000℃. As shown from the results of some analytical methods such as XRD, FT-IR, FE-SEM, impedance spectrum and the measurement of Archemede density,the solid-electrolyte NASICON with grain size of nanometer, good crystallinity and high relative density was synthe- sized successfully by adopting appropriate sintering temperature and period. A linear Arrhenius plot for the resulted NASICON material was achieved and a reasonable active energy was got based on the complex impedance measurement conducted at different temperatures. The solid material possessed an ideal ionic conductivity. Moreover, highly crystallized NASICON showed higher ionic conductivity.