Elucidating the conduction behavior in KBT ceramic

Single-phase powder of lead-free ferroelectric potassium bismuth titanate (K0.5Bi0.5TiO3, abbreviated as KBT) was prepared by the modified sol-gel process, and the crystal structure, microstructure, and electrical properties were investigated. Powder x-ray diffraction pattern confirmed that KBT crys...

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Bibliographic Details
Main Authors: Badole, Manish, Dwivedi, Sushmita, Pareek, Tanvi, Ahmed, Shadab Ali, Kumar, Sunil
Format: Conference Proceeding
Language:English
Subjects:
Bismuth titanate
Ceramic powders
Crystal structure
Crystallization
Diffraction patterns
Electrical properties
Electrical resistivity
Ferroelectricity
Lead free
Room temperature
Sol-gel processes
Temperature
Temperature dependence
Temperature effects
Unit cell
X ray powder diffraction
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Summary:Single-phase powder of lead-free ferroelectric potassium bismuth titanate (K0.5Bi0.5TiO3, abbreviated as KBT) was prepared by the modified sol-gel process, and the crystal structure, microstructure, and electrical properties were investigated. Powder x-ray diffraction pattern confirmed that KBT crystallized in tetragonal (space group: P4mm) unit cell at room temperature. A frequency-dependent diffuse dielectric anomaly ∼356 °C (at 1 MHz) was observed in dielectric constant versus temperature curve. Impedance spectroscopy was employed to study the effect of temperature on conduction and relaxation mechanisms. Temperature dependence of DC conductivity and the relaxation frequency were found to obey Arrhenius behavior, and the activation energies calculated from the linear fitting were found to be 1.02 ± 0.01 eV and 1.08 ± 0.01 eV, respectively. The conduction in 355 °C-505 °C temperature range was attributed to the movement of oxygen vacancies.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0017206