Preparation of sodium zirconophosphossilicate ionic conductor through solution-assisted solid-state reaction method and its impedance analysis

Abstract

The NASICON materials of sodium zirconophosphossilicate (NZSP) has four types of cations however it is difficult to mix four types of cations evenly The aim of this study is to synthesize sodium zirconophosphossilicate (NZSP) that contains less ZrO2 and closes to mono-phase therefore the NASICON material of sodium zirconophosphossilicate (NZSP) is prepared by means of solution?assisted solid?state reaction in this study Calcinated at the calcination condition of 600℃/6 h-1000℃/12 h is close to mono-phase By means of Rietveld refinement the crystal structure of Na3Zr2-2/3Si2PO12-4/3 is monoclinic and the space group is C2/c The relative density of sintering bulks sintered at 1200℃/5 h and 1200℃/10 h are all above 90 % The longer sintering time the larger conductivity and the smaller activation energy of conductivity It can be estimated from the average grain size calculated by the figure of microstructure The grain will change the area of the grain boundary when growing which will reduce the area of the grain boundary it will improve the movement of sodium ions The smaller the barrier encountered when sodium ions move the lower the resistance so the conductivity will be better

Date of Award	2019
Original language	English
Supervisor	Chi-Yuen Huang (Supervisor)