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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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Titanate-based high-entropy perovskite oxides relaxor ferroelectrics
Ketkaeo Bunpang1,2, Suparat Singkammo3, David P Cann4
1Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.
Scientific Reports
|March 13, 2024
Summary
Researchers explored high-entropy perovskite oxides (HEPOs) with varying cations. The study found that specific trivalent cations, like Bi3+, significantly enhance dielectric properties and relaxor ferroelectric behavior in these advanced ceramic materials.
Area of Science:
- Materials Science and Engineering
- Solid State Chemistry
- Dielectric Materials
Background:
- High-entropy perovskite oxides (HEPOs) offer tunable properties for advanced applications.
- Understanding the impact of cation composition on HEPO behavior is crucial for material design.
Purpose of the Study:
- To investigate the effect of different monovalent and trivalent A-site cations on the properties of HEPOs.
- To identify optimal cation combinations for enhanced dielectric and relaxor ferroelectric characteristics.
Main Methods:
- Synthesis of multicomponent perovskite compounds using a solid-state reaction method.
- Characterization of structural, dielectric, and ferroelectric properties of the synthesized ceramics.
Main Results:
- The presence of trivalent Bi3+ cations led to highly dense ceramics with high dielectric constants (~3000), low dielectric loss (~0.1), and relaxor ferroelectric behavior.
- La3+ containing compounds exhibited lower dielectric constants, higher losses, and linear dielectric behavior.
- Monovalent cations had minimal impact on dielectric properties but influenced high-temperature behavior.
Conclusions:
- Tuning the chemical composition, specifically the combination of mono- and trivalent cations, is an effective strategy for developing high-performance relaxor ferroelectrics.
- The (K0.2Bi0.2Ba0.2Sr0.2Ca0.2)TiO3 composition demonstrated stable relaxor ferroelectric characteristics and homogeneous electrical properties.
