Structural, ferroelectric and energy-storage properties of lead-free Zr-doped Bi 0.5 (Na 0.80 K 0.20 ) 0.5 TiO 3 films

Ngo Duc Quan*, Chu T.Thanh Huong, Nguyen T.Hong Phuong, Nguyen Van Hong, Vu Ngoc Hung, Minh Duc Nguyen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)


Perovskite-type lead-free Bi0.5(Na0.80K0.20)0.5(Ti1-xZrx)O3 (BNKT-xZr) ferroelectric films (with x from 0.00 to 0.05) were synthesized on Pt/Ti/SiO2/Si substrates via chemical solution deposition. The influence of Zr4+ concentration on the microstructures, ferroelectric and energy-storage properties of the prepared films was investigated in detail. It showed that the BNKT-xZr films possessed rhombohedral and tetragonal symmetries in morphotropic phase boundary when a small amount of Zr4+ was added. Ferroelectric and energy-storage properties of the films investigated at an applied electric field of 600kV/cm were significantly enhanced with appropriate Zr4+ concentration. The remnant polarization (Pr), maximum polarization (Pmax) and Pmax-Pr values at x=0.02 reached the highest values of 18.1μC/cm2, 42.0μC/cm2 and 24.0μC/cm2, respectively. Thanks to the strong enhancement in Pmax and the large Pmax-Pr value, the highest recoverable energy-storage density gets the value of 4.6J/cm3 for the 2mol.% Zr4+-doped BNKT film. These obtained results indicate that the appropriate Zr4+-doped BNKT films have many application potentials in the advanced capacitors.

Original languageEnglish
Article number1950082
JournalSurface review and letters
Issue number1
Publication statusPublished - 1 Jan 2020


  • energy-storage
  • ferroelectric, piezoMEMS
  • Lead-free
  • perovskite


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