TY - JOUR
T1 - Low temperature-densified NASICON-based ceramics promoted by Na2O-Nb2O5-P2O5 glass additive and spark plasma sintering
AU - Wang, He
AU - Okubo, Keisuke
AU - Inada, Miki
AU - Hasegawa, George
AU - Enomoto, Naoya
AU - Hayashi, Katsuro
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research (KAKENHI No. 26289235 and JP16H6440 ) from the Japan Society for the Promotion of Science (JSPS), and the Elements Strategy Initiative to Form Core Research Center, Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. The authors thank M. Okuma and Y. Uchida for experimental assistance and discussion.
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/9
Y1 - 2018/9
N2 - The effects of spark plasma sintering (SPS) and Na2O-Nb2O5-P2O5 glass additive have been examined for the sintering of Na3Zr2Si2PO12 (NASICON) ceramics. Full densification of NASICON ceramics is achieved at ~1045 °C, which is 200 °C lower than that of typical conventional sintering. The glass addition is demonstrated to markedly promote densification without any negative effects on electrical conductivity. Among all the glass-added samples, the 5 wt% glass-added sample sintered at 1045 °C for 30 min by SPS exhibits the highest ionic conductivity of 1 × 10−3 S cm−1 at 25 °C with the lowest activation energy of 0.32 eV. These properties are almost the same as those of conventional NASICON ceramics. Formation of a trace amount of NaNbO3 as a secondary phase in the glass-added ceramics is due to an insolubility of Nb in the NASICON phase, and has little influence on the electrical conductivity.
AB - The effects of spark plasma sintering (SPS) and Na2O-Nb2O5-P2O5 glass additive have been examined for the sintering of Na3Zr2Si2PO12 (NASICON) ceramics. Full densification of NASICON ceramics is achieved at ~1045 °C, which is 200 °C lower than that of typical conventional sintering. The glass addition is demonstrated to markedly promote densification without any negative effects on electrical conductivity. Among all the glass-added samples, the 5 wt% glass-added sample sintered at 1045 °C for 30 min by SPS exhibits the highest ionic conductivity of 1 × 10−3 S cm−1 at 25 °C with the lowest activation energy of 0.32 eV. These properties are almost the same as those of conventional NASICON ceramics. Formation of a trace amount of NaNbO3 as a secondary phase in the glass-added ceramics is due to an insolubility of Nb in the NASICON phase, and has little influence on the electrical conductivity.
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U2 - 10.1016/j.ssi.2018.04.025
DO - 10.1016/j.ssi.2018.04.025
M3 - Article
AN - SCOPUS:85046781231
VL - 322
SP - 54
EP - 60
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
ER -