Ferroelectric characteristics of BiFeO3 thin films prepared via a simple chemical solution deposition

Abstract

BiFeO 3 ͑BFO͒ thin films were fabricated on Pt͑111͒ / Ti/ SiO 2 / Si substrates by using a polymeric precursor solution under appropriate crystallization conditions. The capacitance dependence on voltage is strongly nonlinear, confirming the ferroelectric properties of the films resulting from the domain switching. The leakage current density increases with annealing temperature. The polarization electric field curves could be obtained in BFO films annealed at 500°C, free of secondary phases. X-ray photoelectron spectroscopy spectra of films annealed at 500°C indicated that the oxidation state of Fe was purely 3+, demonstrating that our films possess stable chemical configurations.

Combinatorial Processing Study for 0.7(Bi0.95La0.05)FeO3-0.3BaTiO3 Ceramics Produced by an Aqueous Tape Casting Method

“…And with the lamination temperature increasing, the bulk density reaches the maximum value of 7.87 g/cm 3 at 110 o C. Besides the temperature, the pressure also shows a great effect on the bulk density. It can be observed that the bulk density first slightly increased with the pressure rising from 40 MPa to 120 MPa, then decreased rapidly to about 6.66 g/cm 3 when the pressure further increased to 160 MPa. These results above indicate the densest ceramics are able to obtain at the lamination temperature of 110 o C with the pressure of 40 MPa.…”

“…It is noted that the bulk density of the ceramics laminated at 20 o C with 40 MPa is only 6.99 g/cm 3 . And with the lamination temperature increasing, the bulk density reaches the maximum value of 7.87 g/cm 3 at 110 o C. Besides the temperature, the pressure also shows a great effect on the bulk density.…”

“…It is noted that the bulk density of the ceramics laminated at 20 o C with 40 MPa is only 6.99 g/cm 3 . And with the lamination temperature increasing, the bulk density reaches the maximum value of 7.87 g/cm 3 at 110 o C. Besides the temperature, the pressure also shows a great effect on the bulk density. It can be observed that the bulk density first slightly increased with the pressure rising from 40 MPa to 120 MPa, then decreased rapidly to about 6.66 g/cm 3 when the pressure further increased to 160 MPa.…”

“…This research is the basis for developing composite and device structure ceramics. Analytical-grade powders of Bi 2 O 3 , La 2 O 3 , Fe 2 O 3 , BaCO 3 and TiO 2 were used to produce 0.7(Bi 0.95 La 0.05 )FeO 3 -0.3BaTiO 3 (0.7BLF-0.3BT) via solid reaction. The mixture of oxides was dried and calcined at 850 o C for 3 h to obtain powder with pure phase structure.…”

“…However, conventional PZT ceramics have serious depoling and ageing problems at temperature above 200 o C which significantly limits their further applications as high-temperature devices [1][2][3] . Besides, the high lead concentration in PZT ceramics is potential harm to environment and ecosystem.…”