TY - JOUR
T1 - Low temperature sintering of ZnO and MnO 2-added (Na 0.5K 0.5)NbO 3 ceramics
AU - Kang, In Young
AU - Seo, In Tae
AU - Cha, Yu Joung
AU - Choi, Jae Hong
AU - Nahm, Sahn
AU - Sung, Tae Hyun
AU - Paik, Jong Hoo
PY - 2012/8
Y1 - 2012/8
N2 - ZnO was used to decrease the sintering temperature of 1.5mol% MnO 2-added (Na 0.5K 0.5)NbO 3(MNKN) ceramics. When a small amount of ZnO (≥2.0mol%) was added, a dense microstructure was observed for specimens sintered at 960°C, with high relative density of 96.0% of the theoretical density. The liquid phase, which was considered to be an Nb 2O 5-MnO-ZnO related phase, was formed in the ZnO-added MNKN ceramics and abnormal grain growth occurred in its presence. Therefore, although a very small amount of ZnO might enter the matrix of the MNKN, most of the ZnO was used to form the liquid phase and assisted the densification of the specimens, indicating that the hardening effect of Zn 2+ was insignificant. The 2.0mol% ZnO-added MNKN (ZMNKN) ceramics sintered at 960°C exhibited the high piezoelectric properties of k p=37%, ε3T/ε0=297, d 33=120pC/N, and Q m=200. In addition, the reaction between the Ag electrode and the ZMNKN ceramic sintered at 960°C was negligible.
AB - ZnO was used to decrease the sintering temperature of 1.5mol% MnO 2-added (Na 0.5K 0.5)NbO 3(MNKN) ceramics. When a small amount of ZnO (≥2.0mol%) was added, a dense microstructure was observed for specimens sintered at 960°C, with high relative density of 96.0% of the theoretical density. The liquid phase, which was considered to be an Nb 2O 5-MnO-ZnO related phase, was formed in the ZnO-added MNKN ceramics and abnormal grain growth occurred in its presence. Therefore, although a very small amount of ZnO might enter the matrix of the MNKN, most of the ZnO was used to form the liquid phase and assisted the densification of the specimens, indicating that the hardening effect of Zn 2+ was insignificant. The 2.0mol% ZnO-added MNKN (ZMNKN) ceramics sintered at 960°C exhibited the high piezoelectric properties of k p=37%, ε3T/ε0=297, d 33=120pC/N, and Q m=200. In addition, the reaction between the Ag electrode and the ZMNKN ceramic sintered at 960°C was negligible.
KW - Grain growth
KW - Grain size
KW - Low temperature sintering
KW - Perovskite
KW - Piezoelectric properties
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U2 - 10.1016/j.jeurceramsoc.2012.01.030
DO - 10.1016/j.jeurceramsoc.2012.01.030
M3 - Article
AN - SCOPUS:84862787802
SN - 0955-2219
VL - 32
SP - 2381
EP - 2387
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 10
ER -