Microstructure and piezoelectric properties of (Na0.5K 0.5)NbO3 lead-free piezoelectric ceramics with V 2O5 addition

In Tae Seo, Hwi Yeol Park, Nguyen Van Dung, Min Kyu Choi, Sahn Nahm, Hyeung Gyu Lee, Byung Hyun Choi

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17 Citations (Scopus)


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.

Original languageEnglish
Article number5306715
Pages (from-to)2337-2342
Number of pages6
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Issue number11
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering


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