The synthesis of lead-free ferroelectric Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3thin films by sol-gel method

T. Yu, Kin Wing Kwok, H. L.W. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

78 Citations (Scopus)


(1 - x)Bi0.5Na0.5TiO3-xBi0.5K0.5TiO3[BNT-BKT-100x] thin films have been successfully deposited on Pt/Ti/SiO2/Si substrates by a sol-gel process together with rapid thermal annealing. A morphotropic phase boundary (MPB) between Bi0.5Na0.5TiO3and Bi0.5K0.5TiO3was determined around x ∼ 0.15. Near the MPB, the film exhibits the largest grain size, the highest ε value (360) and the largest Prvalue (13.8 μC/cm2). The BNT-BKT thin film system is expected to be a new and promising candidate for lead-free piezoelectric applications.
Original languageEnglish
Pages (from-to)2117-2120
Number of pages4
JournalMaterials Letters
Issue number10
Publication statusPublished - 1 Apr 2007


  • Ferroelectric
  • Lead-free
  • MPB
  • Sol-gel process

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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