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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
Reentrant Phenomenon in Barium Titanate Zirconate-Based Relaxor Ferroelectrics
Eva Kröll1, Boriana Mihailova2, Vadzim Haronin3
1Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141, Essen, Germany.
Reentrant relaxor behavior in perovskite ferroelectrics is explained by competing polar and antiferrodistortive modes. Doping suppresses polar order, while oxygen octahedra rotations create antipolar clusters, causing low-temperature dielectric anomalies.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Reentrant phenomena in relaxor ferroelectrics are poorly understood.
- Investigating novel compositions is crucial for understanding complex dielectric behaviors.
Purpose of the Study:
- To explore reentrant relaxor behavior in a doped perovskite system.
- To elucidate the mechanisms behind reentrant phenomena in ferroelectrics.
Main Methods:
- Synthesis and characterization of (1 - x)Ba(Ti0.85Zr0.15)O3-xBi(Zn2/3Nb1/3)O3 solid solutions.
- Dielectric permittivity measurements across various temperatures and frequencies.
- Raman spectroscopy to analyze structural and polar order.
Main Results:
- Observed reentrant relaxor behavior characterized by frequency-independent (Tm) and frequency-dependent (TR) anomalies.
- Doping suppressed the correlation length of B-cation displacements, leading to mesoscopic polar order.
- Antiferrodistortive oxygen octahedra rotations formed antipolar clusters, driving the low-temperature dielectric anomaly.
Conclusions:
- The competition between polar and antiferrodistortive modes is identified as the origin of reentrant relaxor behavior.
- Nanometer-sized antipolar clusters within a polar matrix are key to understanding this phenomenon.
- This study provides insights into the complex phase transitions in perovskite ferroelectrics.
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