Dielectric Relaxation Dynamics and Polaronic Tunneling Conduction Mechanism of Electrical Conductivity of Fe 2 O 3 ‐Doped PbO–ZrO 2 –SiO 2  Glass Ceramics | Zendy

Chandrakala Ch. | Zendy; Siva Sesha Reddy A. | Zendy; Kostrzewa M. | Zendy; Purnachand N. | Zendy; Venkatramaiah N. | Zendy; Naga Raju G. | Zendy; Ravi Kumar V. | Zendy; Veeraiah Nalluri | Zendy

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Dielectric Relaxation Dynamics and Polaronic Tunneling Conduction Mechanism of Electrical Conductivity of Fe 2 O 3 ‐Doped PbO–ZrO 2 –SiO 2 Glass Ceramics

Author(s) -

Chandrakala Ch.,

Siva Sesha Reddy A.,

Kostrzewa M.,

Purnachand N.,

Venkatramaiah N.,

Naga Raju G.,

Ravi Kumar V.,

Veeraiah Nalluri

Publication year - 2021

Publication title -

physica status solidi (a)

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.532

H-Index - 104

eISSN - 1862-6319

pISSN - 1862-6300

DOI - 10.1002/pssa.202100071

Subject(s) - polaron , materials science , dielectric , permittivity , electrical resistivity and conductivity , relaxation (psychology) , conductivity , analytical chemistry (journal) , condensed matter physics , thermal conduction , ceramic , mineralogy , chemistry , composite material , physics , psychology , social psychology , optoelectronics , chromatography , quantum mechanics , electron

This study consists of comprehensive investigations on dielectric permittivity ( ε ′), electric moduli ( M ′, M ″), impedance ( Z ), and conductivity ( σ ac ) spectra over broad regions of frequency and temperature of lead zirconium silicate glass ceramics mixed with different concentrations of Fe 2 O 3 . The observed increase in dielectric permittivity with the content of Fe 2 O 3 is attributed to the increasing presence of iron ions in octahedral positions. Electric moduli plots with frequency ( ω ) and temperature ( T ) exhibit dipolar effects. These effects are quantitatively analyzed by Cole–Cole plots; the analysis indicates the distribution of relaxation times. Probable dipoles for these effects are identified and discussed. AC conductivity ( σ ac ) shows a rising trend with an increase in Fe 2 O 3 beyond 0.2 mol%, and this increase is attributed to the polaron exchange among Fe 2+ and Fe 3+ ions. The conduction mechanism is well explained using a polaron tunneling model in the middle‐frequency and high‐temperature regions.

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