Influence of synthesis methodology and excess Na on the ionic transport properties of natrium super ionic conductor, Na3Zr2Si2PO12

Na3Zr2Si2PO12 is a well-known solid electrolyte because of its potential applications in Na-ion batteries and gas sensors. In this work, the structural and transport properties of Na3Zr2Si2PO12 synthesized by solid-state reaction and sol-gel techniques are compared. In both methods, a monoclinic phase for Na3Zr2Si2PO12 is confirmed by Xray Diffraction and FTIR spectroscopy techniques. The impedance measurements show higher conductivity in Na3Zr2Si2PO12 prepared by solid-state reaction. The role of sintering temperatures on the transport results of Na3Zr2Si2PO12 has been investigated. The temperature dependent conductivity plots of Na3Zr2Si2PO12 show a change in the slope at 163 degrees C corresponding to its structural phase transition from monoclinic to rhombohedral form, which is further supported by its DSC result. Furthermore, the role of excess Na on the ionic conductivity of Na3Zr2Si2PO12 using two different Na precursors Na2CO3 and Na3PO4 keeping same Na-stoichiometry has been investigated.

Automated summary

The structural and transport properties of Na3Zr2Si2PO12 synthesized by solid-state reaction and sol-gel techniques were compared, with the former showing higher conductivity. The impact of sintering temperatures on the transport results was investigated, as well as the role of excess sodium on the ionic conductivity of Na3Zr2Si2PO12.