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Updated: Jan 24, 2026

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
Published on: March 27, 2018
Unexpected phase transition sequence in the ferroelectric Bi4Ti3O12.
Yuan-Yuan Guo1, Alexandra S Gibbs2, J Manuel Perez-Mato3
1School of Chemistry and EaStCHEM, University of St Andrews, St Andrews KY16 9ST, Scotland.
High-temperature studies reveal new details about bismuth titanate (Bi4Ti3O12) phase transitions. An intermediate paraelectric phase with unique octahedral tilting was discovered, clarifying its complex structural behavior.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Crystallography
Background:
- Bismuth titanate (Bi4Ti3O12) is a ferroelectric layered perovskite with complex phase behavior.
- Previous studies reported conflicting structural models and phase transition sequences.
Purpose of the Study:
- To re-examine the high-temperature phase behavior of Bi4Ti3O12.
- To resolve discrepancies in existing structural models and phase transition sequences.
Main Methods:
- High-resolution powder neutron diffraction was employed.
- Analysis focused on structural transitions from high temperatures to ambient conditions.
Main Results:
- Confirmed two structural transitions from the tetragonal aristotype phase (I4/mmm) to the monoclinic ferroelectric phase (B1a1).
- Identified a novel intermediate paraelectric phase with tetragonal symmetry (P4/mbm) above the Curie temperature (TC).
- This intermediate phase exhibits unique alternating octahedral tilting within the perovskite blocks.
Conclusions:
- The study clarifies the complex phase transitions of Bi4Ti3O12.
- The newly identified intermediate phase and its octahedral tilting are rationalized by Bi3+ cation bonding requirements.
- This work provides a more complete understanding of ferroelectric layered perovskites.
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