Quantification of relaxor behavior in (1− x) Na0. 5Bi0. 5TiO3–xCaTiO3 lead-free ceramics system

Roy Roukos, Jimmy Romanos, Sara Abou Dargham, Denis Chaumont

Research output: Contribution to journalArticleAcademicpeer-review


This work examines the relaxor behavior of lead-free ceramic (1 − x)Na0.5Bi0.5TiO3–xCaTiO3 systems. A stable rhombohedral (R3c) phase is detected at room temperature for all compositions by XRD and Raman spectroscopy. Relaxor behavior was observed in the temperature range 300 K - 400 K for all materials. Ceramics exhibit normal ferroelectric properties at room temperature, and then they develop relaxor characteristics with increasing temperature showing the same dispersive properties. This work quantifies the relaxor phenomenon at low temperature. For instance, the maximum temperature of relaxor and the order of dispersion were determined at the strongest dispersion. Finally, the substitution by low CT concentration unaltered the relaxor behavior at low temperature.
Original languageEnglish
Pages (from-to)2297-2303
Number of pages7
JournalJournal of the European Ceramic Society
Issue number7
Publication statusPublished - Jul 2019
Externally publishedYes


  • NBT-CT
  • dielectric properties
  • relaxor behavior
  • order of dispersion


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