Ferroelectric Characterization of La∶BiFeO3/Bi0.5(Na0.85K0.15)0.5TiO3 Nano-composite Films

Authors

Kang Cai, Wuhan Institute of Technology
Hongyang Zhao, Wuhan Institute of TechnologyFollow
Zhibin Ma, Wuhan University of Technology
Hideo Kimura, National Institute For Materials ScienceFollow
Tingting Jia, National Institute For Materials Science
Zhenxiang Cheng, University of WollongongFollow

RIS ID

112414

Publication Details

Cai, K., Zhao, H., Ma, Z., Kimura, H., Jia, T. & Cheng, Z. (2016). Ferroelectric Characterization of La∶BiFeO3/Bi0.5(Na0.85K0.15)0.5TiO3 Nano-composite Films. Rengong Jingti Xuebao/Journal of Synthetic Crystals, 45 (3), 645-648+673.

Abstract

La0.1Bi0.9FeO3 (BFO), Bi0.5(Na0.85K0.15)0.5TiO3(BNKT) and BFO/BNKT nano-composite films were fabricated by pulsed laser deposition (PLD) method on Pt/Ti/SiO2/Si substrate. The ferroelectric properties were enhanced in BFO/BNKT compared to single layer film of BFO and BNKT. The ferroelectric domain structures were observed using piezoresponse force microscopy (PFM). The polarization reversal was time-dependent because the inhomogeneous domains with different coercivity. Evidence can also be seen in the fatigue results which showed unusual profile. The polarization increased as the increase of switching cycles because some of domains are difficult to switch using the applied field. Nano-scale piezoresponse hysteresis loops measured by PFM also revealed the local domain switching behavior in the BFO/BNKT film.