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Updated: Feb 18, 2026

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
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.
Abstract:
The structural, dielectric, and electrical properties of (1-x)BaTi0.9Zr0.1O3 + (x)Li0.5Fe2.5O4 composite ceramics (x = 0.00-0.15) synthesized using the solid-state reaction method were investigated. X-ray diffraction confirmed the coexistence of perovskite and spinel phases, while FESEM revealed microstructural refinement with ferrite substitution. Increasing Li0.5Fe2.5O4 (LFO) content reduced grain size and increased dislocation density, leading to enhanced interfacial polarisation. Dielectric studies exhibited frequency- and temperature-dependent permittivity, with a maximum ε' and minimal dielectric loss at x = 0.10. Electric modulus analysis confirmed thermally activated, non-Debye relaxation, while AC conductivity followed Jonscher's law, transitioning from grain to grain-boundary-controlled conduction with rising temperature. The findings demonstrate tunability of dielectric response and relaxation dynamics, making these composites promising for capacitors, memory devices, and multiferroic applications. The novelty of this work lies in providing a systematic correlation between interfacial polarisation, modulus dynamics, and composition-driven relaxation behaviour across the (x = 0.00-0.15).
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