Electrical conductivity of Na2O–Nb2O5–P2O5 glass and fabrication of glass–ceramic composites with NASICON type Na3Zr2Si2PO12

•Electrical conductivity of xNa2O–(70 − x)Nb2O5–30P2O5 glass was examined.•Na3Zr2Si2PO12 (NASICON) with 10 wt.% NMP glass–ceramics composites exhibits low temperature sintering in 10 min calcination up to 900 °C.•NMP glass have potential as a glass filler materials for solid electroyte in sodium ion batteries.

Electrical conductivity of xNa2O–(70 − x)Nb2O5–30P2O5 glass was examined. The electrical conductivity of the glasses increases monotonously with increasing Na2O content, and the glass of 60Na2O–10Nb2O5–30P2O5 shows the value of σ = 5.6 × 10− 8 Scm− 1 at room temperature and the activation energy (Ea) of 0.54 eV for Na+ ion mobility from 25 °C to 200 °C. We also examined the fabrication of glass–ceramic composites, which is consisted from Na3Zr2Si2PO12 and 60Li2O–10Nb2O5–30P2O5 glass. It found that the mixture of 90 wt.% NaNa3Zr2Si2PO12–10 wt.% 60Na2O–10Nb2O5–30P2O5 glass calcined at 900 °C for 10 min, gives σ = 1.2 × 10− 4 Scm− 1 at room temperature. Na2O–10Nb2O5–30P2O5 glass is suitable filler material for solid electrolyte in sodium ion batteries.