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.
|Number of pages||6|
|Journal||IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control|
|Publication status||Published - 2009 Dec 1|
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Acoustics and Ultrasonics