Reduced leakage current, enhanced ferroelectric and dielectric properties of (La, Fe)-codoped Bi0.5Na0.5TiO3-based thin films

Peng Li, Wei Li, Shaohui Liu, Yang Zhang, Jiwei Zhai*, Haydn Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


The lead-free Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3-SrTiO3 (BNT-BKT-ST) and (La, Fe)-codoped Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3-SrTiO3 (BNT-BKT-ST-LaFe) thin films were deposited on Pt/Ti/SiO2/Si substrates by the sol-gel method. Both the BNT-BKT-ST and BNT-BKT-ST-LaFe thin films exhibit pseudo-cubic perovskite structure and uniform grain size. The leakage current density of BNT-BKT-ST-LaFe thin film at 400 kV/cm is reduced by approximately two orders of magnitude compared with BNT-BKT-ST thin film. Enhanced ferroelectric property is achieved in BNT-BKT-ST-LaFe film with a large remanent polarization of 13 μC/cm2. At the same time, the BNT-BKT-ST-LaFe film also exhibits a large dielectric constant of 420 and small dielectric loss of 0.055 at 100 kHz. These results indicate that the (La, Fe)-codoped BNT-BKT-ST thin film is a promising candidate in lead-free ferroelectric materials.

Original languageEnglish
Pages (from-to)S344-S348
JournalCeramics International
Issue numberS1
StatePublished - 1 Jul 2015


  • (La, Fe)-codoped
  • C. Electrical properties
  • Sol-gel method
  • Thin film

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