Structural and piezoelectric properties of MnO2-added 0.95(Na0.5K0.5)NbO3-0.05SrTiO3 ceramics

In Tae Seo, Chang Hoi Choi, Min Soo Jang, Bo Yun Kim, Guifang Han, Sahn Nahm, Kyung Hoon Cho, Jong Hoo Paik

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The structural and piezoelectric properties of the xmol% MnO 2-added 0.95(Na0.5-x/200K0.5-x/200)NbO 3-0.05SrTiO3 [(NK)xMN-ST] ceramics were investigated. A dense microstructure with enlarged grains was formed for the specimens sintered at 1040°C through liquid-phase sintering. However, the grain size decreased for the specimen sintered at 1060°C because of the formation of a large amount of the liquid phase. Therefore, the microstructural variations in the (NK)xMN-ST ceramics can be explained by liquid-phase-assisted abnormal grain growth. The specimens sintered at 1020 and 1060°C showed low piezoelectric properties because of their low relative density and small grain size, respectively. On the other hand, the (NK)xMN-ST ceramic with x = 0.1 sintered at 1040°C showed promising piezoelectric properties: d33 =260pC/N, kp = 0.42, Qm = 202 and εT 330 = 1291.

Original languageEnglish
Pages (from-to)47-50
Number of pages4
JournalSensors and Actuators, A: Physical
Publication statusPublished - 2013


  • Lead free
  • Microstructure
  • NKN-ST
  • Piezoelectric

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering


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