Oxide effect on the dielectric behavior of a ternary titanate-based composite: exploration on broadband dielectric permittivity

Kouzrit, Daoud ; Khouni, Habib ; Bourouba, Nacerdine ; Bouzit, Nacerdine ; Brahimi, Abdelhalim ; Martinez J., Juan Pablo (Universidad de Zaragoza)

Resumen: This article examines the dispersion phenomenon and the influence of silicon dioxide (SiO2) on the complex permittivity of binary composites made of epoxy resin (RE) and barium titanate (BaTiO₃). Using Time-Domain Spectroscopy (TDS), the samples were characterized over a frequency range from DC to 30 GHz. The volume fractiondependent relative permittivity of these composites was modeled using the modified Lichtenecker mixing law (MLL). Numerical optimization was employed to refine the model parameters, offering predictive insights into dielectric permittivity and shape factor coefficients for ternary composites. Comparative analysis confirms the model's suitability for binary and ternary composites, with an efficiency estimated at an average error of less than 2%. A Lorentzian resonance model is proposed to characterize the frequency-dependent behavior of the complex permittivity. The frequency dispersion profile of this ternary composite permittivity, exhibiting both relaxation and resonance spectra, shows a clear evolution with increasing BaTiO₃ content. Our empirical model provides a robust description of the resonance-type complex permittivity for BaTiO₃ and silica composites. The inclusion of SiO2 in the binary composite produced remarkable effects on the composite permittivity and loss tangent (tan δ) values, as these dropped drastically by 60%. These materials are promising for the miniaturization of electronic components in microelectronics and telecommunications applications.

Idioma: Inglés

DOI: 10.18280/acsm.500101

Año: 2026

Publicado en: ANNALES DE CHIMIE-SCIENCE DES MATERIAUX 50, 1 (2026), 1-11
ISSN: 0151-9107

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Electromagnetismo (Dpto. Física Aplicada)