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Interfacial polarisation, electrical modulus and relaxation dynamics in composite ceramics for multiferroic
Ganapathi Rao Gajula1, Lakshmi Rekha Buddiga2, Ganganagunta Srinivas3
1Institute of Aeronautical Engineering, Dundigal, Hyderabad, Telangana 500043, India.
Journal of Colloid and Interface Science
|February 16, 2026
Summary
This study explores composite ceramics made from barium titanate zirconate and lithium ferrite. Findings show tunable dielectric properties and relaxation behavior, suggesting potential for advanced electronic devices.
Area of Science:
- Materials Science
- Solid State Chemistry
- Dielectric Materials
Background:
- Barium titanate zirconate (BZT) and lithium ferrite (LFO) are functional ceramic materials.
- Composite ceramics offer a route to tailor material properties.
- Understanding structure-property relationships is crucial for device applications.
Purpose of the Study:
- Investigate the structural, dielectric, and electrical properties of (1-x)BaTi0.9Zr0.1O3 + (x)Li0.5Fe2.5O4 composite ceramics.
- Correlate composition with interfacial polarization, relaxation dynamics, and conductivity.
- Explore potential applications in capacitors, memory, and multiferroic devices.
Main Methods:
- Solid-state reaction method for synthesis.
- X-ray diffraction (XRD) for phase analysis.
- Field Emission Scanning Electron Microscopy (FESEM) for microstructure.
- Dielectric spectroscopy and electric modulus analysis.
- AC conductivity measurements.
Main Results:
- Confirmed coexistence of perovskite (BZT) and spinel (LFO) phases.
- Ferrite substitution refined microstructure, reduced grain size, and increased dislocation density.
- Enhanced interfacial polarization observed with increasing LFO content.
- Optimal dielectric properties (maximum permittivity, minimal loss) at x = 0.10.
- Non-Debye relaxation and temperature-dependent AC conductivity conforming to Jonscher's law.
Conclusions:
- Compositional tuning effectively modifies dielectric response and relaxation dynamics.
- Interfacial polarization plays a key role in the observed electrical behavior.
- These composite ceramics show promise for advanced electronic applications.
- Systematic correlation between composition, polarization, and relaxation behavior established.
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