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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
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Ferroelectric-like metallic state in electron doped BaTiO3
J Fujioka1, A Doi1, D Okuyama2
1Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan.
Scientific Reports
|August 21, 2015
Summary
Electron doping in Barium Titanate (BaTiO3) creates a novel ferroelectric-like metallic state. This emergent state exhibits reduced polarization anisotropy and unusual electron-phonon coupling, enabling a metallic ferroelectric structure.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Barium Titanate (BaTiO3) is a well-known ferroelectric material.
- Achieving metallic ferroelectricity in oxides is a significant scientific challenge.
Purpose of the Study:
- To investigate the effects of electron doping on the ferroelectric properties of BaTiO3.
- To explore the possibility of creating a metallic ferroelectric state.
Main Methods:
- X-ray diffraction and electron diffraction were used to analyze crystal structure.
- Infrared spectroscopy was employed to study phonon behavior.
- Electrical resistivity measurements were conducted.
Main Results:
- A ferroelectric-like metallic state was induced in BaTiO3 via electron doping.
- Reduced anisotropy of polarization and nanometer-scale heterogeneous crystal structure were observed.
- Enhanced infrared intensity of soft phonon and reduced resistivity suggest unusual electron-phonon coupling.
Conclusions:
- The study demonstrates the creation of a metallic ferroelectric state in BaTiO3.
- Unusual electron-phonon coupling is proposed as the mechanism responsible for this emergent property.
- This finding opens new avenues for designing advanced functional materials.
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