Investigation on dielectric and piezoelectric properties of (1-x)(Na 0.5K0.5)NbO3-xSrTiO3 ceramics

K. Sasanuma, S. Tsukada, J. Kano, S. Kojima, R. Wang, K. Hanada, K. Matsusaki, H. Bando

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


Lead-free piezoelectric (1-x)(Na0.5K0.5)NbO3-xSrTiO3 ((1-x)NKN- xST) solid solution has been fabricated around a morphotropic phase boundary (MPB) by Spark-Plasma-Sintering method. The phase diagram around MPB was studied by the dielectric measurement. The piezoelectric constant d33 and electromechanical constant kp measurements shows that MPB is about at x = 0.05. Inverse dielectric constants are well fitted by the extended Curie-Weiss law above the Curie temperature and its fitting result shows that the fitting parameters, C and n values show the maxima for 0.95NKN-0.05ST. We suggest the existence of another phase boundary around x = 0.05. To confirm the another phase boundary, the Raman spectra of 0.975NKN-0.025ST and 0.9NKN-0.1ST samples at the tetragonal phases have been measured and comparison has been done.

Original languageEnglish
Pages (from-to)106-112
Number of pages7
Publication statusPublished - 2007
Externally publishedYes
Event8th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity, RCBJSF-8 - Tsukuba, Japan
Duration: May 15 2006May 19 2006


  • Dielectric
  • Diffuse phase transition
  • Ferroelectrics
  • Lead-free
  • MPB
  • Piezoelectric ceramics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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