Research article

Variable-temperature measurements of the dielectric relaxation spectroscopy in 0.1SiO₂-0.2CaO-0.2Na₂O-0.5P₂O₅ bioactive glass materials

¹Hogga Z, ²Costa LC, ³Taibi M, ²Graça MPF, ⁴Achour ME and ^*1Hafid MM

¹Laboratory of Engineering Physics and environment, Department of Physics, Faculty of sciences, University Ibn Tofail, 14000 Kenitra, Morocco

²I3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal

³University Mohammed V –Agdal Laboratory of Physical and chemistry inorganic and organic materials ENS Rabat

⁴LASTID Laboratory Physics Department, Faculty of Sciences, Ibn-Tofail University Ibn Tofail, BP 133, 14 000 Kenitra, Morocco

*Corresponding Author E-Mail: mymustaphahafid@gmail.com, telephone: +212537329292, fax:  +212537329290

Accepted 20 May 2015

Abstract

Bioactive glasses with chemical composition 0.1SiO₂-0.2CaO-0.2Na₂O-0.5P₂O₅  have been prepared. The dielectric properties of the samples were measured in the frequency range from 100 Hz to 1 MHz and temperatures range from 100 to 370 K (Tg ≈ 400 K). The obtained data were analyzed by the means of dielectric permittivity representation and modeled using the Havriliak–Negami equation. Various relaxation parameters were calculated with accuracy. Furthermore, investigation of the temperature dependence of their relaxation time using the Vogel–Tammam–Fulcher (VTF) model shows the weak interaction between alkali ions constituents and molecular network-formers for temperatures up to the glass transition.

Keywords: amorphous materials, composite; chemical synthesis; differential scanning calorimetry; impedance spectroscopy electrical properties; dielectric properties.