Structural variation and piezoelectric properties of 0.95(Na0.5K0.5)NbO3-0.05BaTiO3 ceramics

Cheol Woo Ahn, Hwi Yeol Park, Sahn Nahm, Kenji Uchino, Hyeung Gyu Lee, Hwack Joo Lee

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

A dense microstructure was developed for the 0.95(Na0.5K0.5)NbO3-0.05BaTiO3 (0.95NKN-0.05BT) ceramics sintered at above 1050 °C. Grain growth was observed in the specimens sintered at 1050-1060 °C while a liquid phase was found in the specimens sintered at above 1050 °C, which explained the increased sinterability and grain size. KTiNbO5 and Ba6Ti2Nb8O30 second phases were also observed for the specimens sintered at above 1060 °C. Evaporation of Na2O was responsible for the formation of the liquid phase and the KTiNbO5 and Ba6Ti2Nb8O30 second phases. Muffling with 0.95NKN-0.05BT powders during the sintering improved the piezoelectric properties, possibly due to the increased poling efficiency resulting from the reduced Na2O evaporation.

Original languageEnglish
Pages (from-to)255-260
Number of pages6
JournalSensors and Actuators, A: Physical
Volume136
Issue number1
DOIs
Publication statusPublished - 2007 May 1

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Keywords

  • Alkaline niobate
  • Barium titanate
  • Lead-free piezoelectric ceramics

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Instrumentation

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