A method for synthesizing a monolithic sodium zincsilicate that has a particle size of less than 100 nm that may be used to produce a solid electrolyte for sodium ion battery applications A reduced particle size of sodium zincsilicate improves the ionic conductivity of sodium zincsilicate and therefore, results in an improved battery performance . This is achieved by processing a sodium zincsilicate precursor into a discrete particles thereof and further subjecting the parti cles to a sintering process. The method in the present invention differs from conventional methods as it uses a combination of chemical reactions followed by a sintering process that utilizes lower temperature compared to those of conventional methods. High temperature treatment to produce sodium zincsilicate is undesirable as it causes agglomeration of the particles