Ferroelectric BiFeO3-PbTiO3 thin films on Pt/Si substrates.
In this work we report on the preparation and properties of bismuth ferrite lead titanate films [(1- x)BiFeO(3-x)PbTiO3] with tetragonal compositions (x = 0.8 and 0.7) and compare them with compositions close to the morphotropic phase boundary (MPB; x = 0.4 and 0.3). The films were prepared by pulsed laser deposition on Pt/Si substrates, and exhibited a dense columnar grain growth. X-ray diffraction analysis revealed that the films have a perovskite structure with a preferred (111) texture. The dielectric properties, polarization-field hysteresis, and leakage current behavior of the films is also reported. For MPB compositions, the films exhibited remanent polarizations with 2Pr up to 100 microC cm(-2) and E(c) approximately 185 kV cm(-1) under a maximum applied field of 500 kV cm(-1), while the tetragonal compositions exhibited 2Pr values in the range of 45-52 microC cm(-2) with a coercive field E(c) approximately 118 kV (-1).
Khan
Mikael A
MA
Institute for Materials Research, University of Leeds, Leeds, UK. sms3mak@leeds.ac.uk
Comyn
Tim P
TP
Bell
Andrew J
AJ
D002516:Ceramics / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D017097:Electric Impedance; D007501:Iron / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D008422:Materials Testing; D008567:Membranes, Artificial; D010984:Platinum / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D008567:Membranes, Artificial; C481719:lead titanate; D007854:Lead; D010984:Platinum; D014025:Titanium; D007501:Iron; D012825:Silicon