Abstract: Nanocrystalline solid material of NASICON (sodium super ionic conductor) was synthesized 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 conducted 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 synthesized 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.

Key words: nanocrystalline solid material, NASICON, sintering temperature, densification