Dielectric and ferroelectric properties of BNT-based thin films by pulsed laser deposition

Mehdi Hejazi, Ahmad Safari

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

We have studied the effect of laser repetition rate on the microstructure, crystallographic orientation, dielectric and ferroelectric properties of pulsed laser deposited 0.94(Bi0.5Na0.5)TiO3-0. 04(Bi0.5K0.5)TiO3-0.02BaTiO3 thin films on SrRuO3 coated SrTiO3 substrates. The films were deposited at different repletion rates of 2 Hz, 4 Hz and 8 Hz, while the other processing parameters such as the substrate temperature and oxygen partial pressure were kept constant. It has been demonstrated that the film made at 4 Hz has been epitaxially grown on the substrate with a smooth and flawless surface and shows the best ferroelectric properties among the investigated films. The remnant polarization and dielectric constant for this film were measured to be 13.6 μC.cm-2 and 425 (at 1 MHz). The leakage current density of the optimized film is 1.3>10-5 A.cm-2 at 320 kV.cm -1, which is about 3 orders of magnitude lower than those observed in the films prepared at repetition rates of 2 Hz and 8 Hz. The remnant polarizations for the films deposited at 2 Hz and 8 Hz were found to be 8.7 μC.cm-2 and 7.6 μC.cm-2, respectively.

Original languageEnglish (US)
Title of host publicationProceedings of the 2010 IEEE International Symposium on the Applications of Ferroelectrics, ISAF 2010, Co-located with the 10th European Conference on the Applications of Polar Dielectrics, ECAPD 2010
DOIs
StatePublished - 2010
Event2010 IEEE International Symposium on the Applications of Ferroelectrics, ISAF 2010, Co-located with the 10th European Conference on the Applications of Polar Dielectrics, ECAPD 2010 - Edinburgh, Scotland, United Kingdom
Duration: Aug 9 2010Aug 12 2010

Publication series

NameProceedings of the 2010 IEEE International Symposium on the Applications of Ferroelectrics, ISAF 2010, Co-located with the 10th European Conference on the Applications of Polar Dielectrics, ECAPD 2010

Other

Other2010 IEEE International Symposium on the Applications of Ferroelectrics, ISAF 2010, Co-located with the 10th European Conference on the Applications of Polar Dielectrics, ECAPD 2010
Country/TerritoryUnited Kingdom
CityEdinburgh, Scotland
Period8/9/108/12/10

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

Keywords

  • BNT
  • Lead-free piezoelectric
  • Pulsed laser deposition
  • Thin film

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