Dielectric relaxation and a.c. conduction phenomena of PbO–PbF2–B2O3 glasses doped with FeO

Influence of Fe2O3 on the physical, structural and electrical properties of sodium lead borate glasses

“…Hence, the correlation between the state and the position of the iron ion in the glass network and its physical properties is expected to be highly interesting [20].…”

Dielectric Relaxation Dynamics and Polaronic Tunneling Conduction Mechanism of Electrical Conductivity of Fe2O3‐Doped PbO–ZrO2–SiO2 Glass Ceramics

“…Such defects are anticipated to provide easy pathways for the diffusion of conducting species that contribute to the conductivity. Interestingly, the absorption spectra also exhibited another band at about 980 nm connected to 5 T 2g → 5 E g octahedral transition of Fe 2+ ( d 6 ) ions; [ 26,27 ] the intensity of this band is found to be feeble in the spectra of the preheated samples. Such divalent iron ions are predicted to exhibit dipolar relaxation effects.…”

Total Conductivity of Calcium Iron Borate Glasses Using an Empirical Formula

“…Iron doped calcium/borate glasses are highly important due to their higher thermal expansion coefficients, lower transition temperature and higher electrical conductivities. Borate oxide glasses were utilized for many useful applications, such as solid state batteries and photonics and laser technology (Veerabhadra et al, 2006). The structure of most oxide glasses is more homogeneous when one or more transition metal oxide is added to their chemical composition.…”

“…In most oxide glasses, electrical conductivity due to ionic motion results from the transport of cations. Studies on iron doped oxide glasses showed that iron ions exist mainly in Fe 3+ state, occupy tetrahedral positions and when introduced in higher concentrations it increases the electrical conductivity of the glass (Veerabhadra et al, 2006). On the other hand, it is well known that electrical ac conductivity can shed a considerable light on the nature of conducting processes and mechanisms in oxide glasses doped with ionic conductors (Lestanguennec and Elliott, 1994).…”

“…, where, A is the pre-factor constant, which is a function of temperature and composition, ω is the angular frequency and s is the exponent factor of the power law, 0 1 s ≥ ≥ , (Das et al, 2013;Kumar, 2013;Veerabhadra et al, 2006). In most cases, the separation between the dc and ac conductivities is a very difficult process, so this work presents an empirical expression to describe the measured conductivity as a function of the static dielectric constant, the activation energy and the exponent factor s. Then the total measured conductivity can easily be modeled and fitted to the experimentally measured data.…”