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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.