(Bi1/2K1/2)TiO3lead-free ferroelectric ceramics: Processing, properties, and compositional modifications

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8 Citations (Scopus)


Bismuth potassium titanate (Bi1/2K1/2)TiO3 with an A-site complex perovskite structure is regarded as a promising lead-free ferroelectric/piezoelectric material. Studies on the fundamental properties of (Bi1/2K1/2)TiO3 have, however, been faced with difficulties in fabricating dense and phase-pure (i.e., "high-quality") bulk ceramics caused by its low melting point and the volatility of Bi and K. This paper reviews our findings on the fabrication process and fundamental properties of such high-quality (Bi1/2K1/2)TiO3 ceramics. After a brief survey on the crystal structure and physical/chemical stability of (Bi1/2K1/2)TiO3, our fabrication process of (Bi1/2K1/2)TiO3 ceramics utilizing the hydrothermal synthesis method is described. Then, the phase transition behavior of (Bi1/2K1/2)TiO3 is discussed based on the electrical and electromechanical responses of the high-quality ceramic samples. The last part of this paper presents two examples of compositional modifications of (Bi1/2K1/2)TiO3 ceramics aiming at developing dielectric and piezoelectric materials for use in capacitors and actuators.

Original languageEnglish
Pages (from-to)496-503
Number of pages8
JournalJournal of the Ceramic Society of Japan
Issue number8
Publication statusPublished - 2021 Aug 1


  • Bismuth potassium titanate
  • Ceramic processing
  • Ferroelectric ceramics
  • Hydrothermal method
  • Pb-free material
  • Phase transition

ASJC Scopus subject areas

  • Ceramics and Composites
  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry


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