Low temperature sintering of Na1 + xZr2SixP3 − xO12 by the addition of Na3BO3

Relationship between room-temperature ionic conductivities and sintering temperatures for Na1 + xZr2SixP3 − xO12 (NASICON) ceramics. In this study, NASICON ceramic with 9.1 wt% Na3BO3 was prepared by liquid phase sintering at 700 °C. The obtained ceramic exhibited three order of magnitude higher conductivity of 1 × 10− 4 S cm− 1 than that of the Na3BO3 free ceramic. The Na3BO3 additive can reduce the NASICON sintering temperature by 200-300 °C.167