Preparation of Sodium Ionic Conductor Based on Sol-Gel Method Using Aqueous Solution

Abstract

A well-crystallized sodium super ionic conductor (NASICON: Na 1+ x Zr 2 Si x P 3- x O 12 , 0≤x≤3) was synthesized by a sol-gel method from aqueous solutions of inorganic materials with an Na excess stoichiometric composition at a relatively low temperature of 850° C. A trace of monoclinic ZrO 2 was observed, however, with increasing calcination temperatures up to 1000° C. It was found that the process of making sol from solutions was the most important step to reduce secondary phases such as ZrO 2 . NASICON thickfilms were also fabricated on a quartz substrate by a spin-coating method using a paste made from fine xerogel powder and isoamyl alcohol.