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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
Ferroelectricity in strain-free SrTiO3 thin films
1Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706, USA.
Physical Review Letters
|September 28, 2010
Summary
Biaxial strain stabilizes ferroelectricity in strontium titanate (SrTiO3) films by correlating pre-existing nanopolar regions. This effect is linked to unintentional strontium deficiency, not the material
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Biaxial strain can induce ferroelectricity in materials not typically exhibiting this property, such as strontium titanate (SrTiO3).
- Understanding the fundamental mechanisms behind strain-induced electronic phenomena is crucial for advanced materials design.
Purpose of the Study:
- To investigate the role of biaxial strain in inducing ferroelectricity in SrTiO3 thin films.
- To elucidate the underlying mechanisms responsible for strain-induced ferroelectric properties in SrTiO3.
Main Methods:
- Comparative analysis of strained and strain-free SrTiO3 films and bulk crystals.
- Utilized dielectric, ferroelectric, Raman spectroscopy, nonlinear optical, and nanoscale piezoelectric property measurements.
Main Results:
- All SrTiO3 films and bulk crystals exhibit relaxor ferroelectric behavior.
- Biaxial strain stabilizes longer-range correlations of pre-existing nanopolar regions in SrTiO3.
- Nanopolar regions likely originate from unintentional strontium deficiency in nominally stoichiometric samples.
Conclusions:
- SrTiO3 is fundamentally a relaxor ferroelectric, with strain acting to enhance ferroelectric correlations.
- Stoichiometry plays a critical role in strain and epitaxy-induced electronic phenomena in oxide films and heterostructures.
- These findings impact the understanding of ferroelectricity in oxide materials and heterostructures.
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