Effects of improved process for CuO-doped NKN lead-free ceramics on high-power piezoelectric transformers

Song Ling Yang, Cheng Che Tsai, Yi Cheng Liou, Cheng Shong Hong, Bing Jing Li, Sheng Yuan Chu

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


In this paper, the effects of the electrical properties of CuO-doped (Na 0.5K 0.5)NbO 3 (NKN) ceramics prepared separately using the B-site oxide precursor method (BO method) and conventional mixed-oxide method (MO method) on high-power piezoelectric transformers (PTs) were investigated. The performances of PTs made with these two substrates were compared. Experimental results showed that the output power and temperature stability of PTs could be enhanced because of the lower resonant impedance of the ceramics prepared using the BO method. In addition, the output power of PTs was more affected by the resonant impedance than by the mechanical quality factor (Q m) of the ceramics. The PTs fabricated with ceramics prepared using the BO method showed a high efficiency of more than 94% and a maximum output power of 8.98 W (power density: 18.3 W/cm 3) with temperature increase of 3°C under the optimum load resistance (5 kΩ) and an input voltage of 150 V pp. This output power of the lead-free disk-type PTs is the best reported so far.

Original languageEnglish
Article number6141146
Pages (from-to)2555-2561
Number of pages7
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Issue number12
Publication statusPublished - 2011 Dec

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering


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