A dense NASICON sheet prepared by tape-casting and low temperature sintering.

Ceramic sheet of Na + ion-conducting solid electrolyte, Na 3 Zr 2 Si 2 PO 12 (NASICON), has been prepared by tape-casting method. Addition of 60Na 2 O-10Nb 2 O 5 -30P 2 O 5 glass as a sintering aid is crucial for fabrication of fully-densified impermeable sheet. Otherwise the gas tightness is not achieved even sintered at 1200 °C. The best preparation condition is 5 or 10 wt% grass-addition with respect to NASICON and sintering at 1000–1100 °C, which is lower by 100–200 °C than the typical densification temperature of NASICON without the additive. A sample with a thickness of 35 μm and total conductivity of 4.4 × 10 −4  S cm −1 is obtained by 5 wt% glass addition and sintering at 1100 °C for 4 h. [ABSTRACT FROM AUTHOR]