TY - JOUR
T1 - Microstructure and piezoelectric properties of (Na0.5K 0.5)NbO3 lead-free piezoelectric ceramics with V 2O5 addition
AU - Seo, In Tae
AU - Park, Hwi Yeol
AU - Van Dung, Nguyen
AU - Choi, Min Kyu
AU - Nahm, Sahn
AU - Lee, Hyeung Gyu
AU - Choi, Byung Hyun
N1 - Funding Information:
manuscript received september 12, 2008; accepted august 10, 2009. This research was supported by a grant from the center for advanced materials Processing (camP) of the 21st century Frontier r&d Program, which was funded by the ministry of commerce, Industry and Energy (mocIE), republic of Korea.
PY - 2009
Y1 - 2009
N2 - Various amounts of Nb2O5 in the (Na 0.5K0.5) NbO3 (NKN) ceramic were replaced by V2O5 to decrease its sintering temperature to below 950°C. A small V2O5 content resulted in a dense microstructure with an increased grain size for the specimen sintered at 900°C due to the presence of a liquid phase. When V2O5 was added to the NKN ceramics, their orthorhombic-to-tetragonal transition temperature increased from 178°C to around 200°C. However, their Curie temperature decreased from 402°C to around 330°C. The κp, ε3T/ε0, and Qm values increased with V2O5 addition, probably due to the increased density and poling state, which was identified by the phase angle. The specimen with x = 0.05, sintered at 900°C for 8 h, exhibited the following piezoelectric properties: κp = 0.32, ε3 T/ε0 = 245, d33 = 120 (pC/N), and Qm = 232.
AB - Various amounts of Nb2O5 in the (Na 0.5K0.5) NbO3 (NKN) ceramic were replaced by V2O5 to decrease its sintering temperature to below 950°C. A small V2O5 content resulted in a dense microstructure with an increased grain size for the specimen sintered at 900°C due to the presence of a liquid phase. When V2O5 was added to the NKN ceramics, their orthorhombic-to-tetragonal transition temperature increased from 178°C to around 200°C. However, their Curie temperature decreased from 402°C to around 330°C. The κp, ε3T/ε0, and Qm values increased with V2O5 addition, probably due to the increased density and poling state, which was identified by the phase angle. The specimen with x = 0.05, sintered at 900°C for 8 h, exhibited the following piezoelectric properties: κp = 0.32, ε3 T/ε0 = 245, d33 = 120 (pC/N), and Qm = 232.
UR - http://www.scopus.com/inward/record.url?scp=73849111282&partnerID=8YFLogxK
U2 - 10.1109/TUFFC.2009.1321
DO - 10.1109/TUFFC.2009.1321
M3 - Article
C2 - 19942520
AN - SCOPUS:73849111282
SN - 0885-3010
VL - 56
SP - 2337
EP - 2342
JO - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
JF - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
IS - 11
M1 - 5306715
ER -