Ferroelectric BiFeO/sub 3/-PbTiO/sub 3/ thin films on Pt/Si substrates

Abstract

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).

Structure-property relations in multifunctional bismuth ferrite - lead titanate

“…We have previously reported on the maximum in switchable polarization in the vicinity of the morphotropic phase boundary composition in BiFeO 3 -PbTiO 3 thin films prepared by pulsed laser deposition (PLD) [7]. The switchable polarization ΔP measured by the PUND method for x = 0.6 films on platinised silicon is 80 µC cm -2 , similar to that obtained for epitaxial BiFeO 3 films on SrTiO 3 [8].…”

Investigation on structural, dielectric and ferroelectric properties of samarium-substituted BiFeO3–PbTiO3 composites

“…10 The polycrystalline sample of BFO-PTO has achieved tremendous attention among researchers for its huge industrial applications due to the increase in multiferroic activity. [11][12][13][14] Recently, some modification of these samples is being used for various applications such as actuators, transducers, sensors, multiple state memories, spintronics, etc. 15,16 Therefore, in order to know the behavior of 0.8BFO-0.2PTO, which is very close to MPB, we have reported the structural, dielectric and ferroelectric properties of 0.8BiSm x Fe 1Àx O 3 -0.2PbTiO 3 with x ¼ 0:05, 0.10, 0.15 and 0.20, prepared by using the conventional solid-state reaction technique.…”

Composition dependence of xBiFeO<inf>3</inf>-(1-x)PbTiO<inf>3</inf> films prepared by sol-gel technique

“…The remanent polarization (Pr) and coercive field (Ec) are approximate 35.5 ȝC/cm 2 and 165 kV/cm at 680 kV/cm at room temperature, respectively. The Pr of 0.7BFO-0.3PT film in this work is much higher than that in 0.7BFO-0.3PT films prepared by sol-gel which is 2.05 ȝC.cm í2 [14] and comparable with that in the BFO-PT thin films fabricated by pulsed laser deposition with a Pr of about 40 ȝC/cm 2 [16], respectively. It is even comparison to that in PZT film (Pr=35 ȝC/cm 2 ) [17].…”