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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
Published on: March 27, 2018
Ferroelectric BiFeO3-PbTiO3 thin films on Pt/Si substrates
Mikael A Khan1, Tim P Comyn, Andrew J Bell
1Institute for Materials Research, University of Leeds, Leeds, UK. sms3mak@leeds.ac.uk
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 16, 2008
Summary
This study explores bismuth ferrite lead titanate films, finding compositions near the morphotropic phase boundary exhibit superior ferroelectric properties, including higher remanent polarization, compared to tetragonal compositions.
Area of Science:
- Materials Science
- Solid State Physics
- Ferroelectric Materials
Background:
- Bismuth ferrite and lead titanate are key perovskite materials with significant ferroelectric properties.
- Tuning composition in (BiFeO3)x(PbTiO3)1-x systems is crucial for optimizing ferroelectric performance.
- Understanding phase boundaries, particularly the morphotropic phase boundary (MPB), is vital for material design.
Purpose of the Study:
- To prepare and characterize (1-x)BiFeO3-xPbTiO3 films with varying compositions.
- To compare the ferroelectric properties of tetragonal compositions with those near the MPB.
- To investigate the influence of composition on dielectric properties, polarization, and leakage current.
Main Methods:
- Pulsed laser deposition (PLD) was used to fabricate thin films on Pt/Si substrates.
- X-ray diffraction (XRD) was employed to analyze crystal structure and texture.
- Electrical measurements were conducted to determine dielectric properties, polarization-field hysteresis, and leakage current.
Main Results:
- Films exhibited a dense columnar grain growth and a perovskite structure with preferred (111) texture.
- Compositions near the MPB (x=0.4, 0.3) showed significantly higher remanent polarization (2Pr up to 100 µC/cm²) and coercive field (Ec ~185 kV/cm).
- Tetragonal compositions (x=0.8, 0.7) displayed lower remanent polarization (2Pr = 45-52 µC/cm²) and coercive field (Ec ~118 kV/cm).
Conclusions:
- Compositions of bismuth ferrite lead titanate films near the MPB possess enhanced ferroelectric properties.
- The study demonstrates the tunability of ferroelectric characteristics by adjusting the BiFeO3-PbTiO3 ratio.
- These findings are significant for the development of advanced lead-free ferroelectric devices.
