NDLI: Polaronic transport in iron phosphate glasses containing HfO<sub>2</sub> and CeO<sub>2</sub>

Content Provider	Royal Society of Chemistry (RSC)
Author	Banhatti, Radha D. Pavić, Luka Šantić, Ana Ertap, Hüseyin Karabulut, Mevlüt Yüksek, Mustafa Moguš-Milanković, Andrea
Copyright Year	2017
Abstract	The electrical and dielectric properties of three series of glasses, xHfO2–(40 − x)Fe2O3–60P2O5, 0 ≤ x ≤ 8 mol%, xCeO2–(40 − x)Fe2O3–60P2O5, 0 ≤ x ≤ 8 mol%, and xHfO2–(38 − x)Fe2O3–2B2O3–60P2O5 2 ≤ x ≤ 6 mol%, have been investigated by impedance spectroscopy over a wide frequency and temperature range. As expected, these glasses exhibit polaronic conductivity which strongly depends on the fraction of ferrous ions, Fe2+/Fetot. Following a detailed discussion on the DC conductivity, we use the MIGRATION concept to model their conductivity spectra. It is found that in each series of glasses, the shape of the conductivity isotherms remains the same indicating that the time-temperature superposition principle is satisfied and that the mechanism of conductivity is the same. Returning to a model-free scaling procedure, namely Summerfield scaling, it is found that while conductivity isotherms for each composition yield a master curve, we need to suitably shift individual master curves on the frequency axis to generate a super-master curve. We examine the dependence of the DC conductivity and the shift factors on the number density of charge carriers. Next, using the fact that the dielectric strength of relaxation for each isotherm is well-defined in these systems, we scale the conductivity isotherms using the Sidebottom scaling procedure. This procedure yields a super-master curve, implying that length scales for polaronic transport also change with composition. Further, using the scaling features of permittivity spectra, we extract in a straightforward way the characteristic spatial extent of localized hopping of polarons and find that it decreases with increasing number density of charge carriers. The magnitude of these values obtained from permittivity spectra lies in the same range as those for the polaron radius calculated using the equation proposed by Bogomolov and Mirilin.
Starting Page	3999
Ending Page	4009
Page Count	11
File Format	HTM / HTML PDF
ISSN	14639076
Volume Number	19
Issue Number	5
Journal	Physical Chemistry Chemical Physics
DOI	10.1039/c6cp04226k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Polaron Dielectric strength Bogomolov Mirilin Number density Dielectric Time\u2013temperature superposition Correlation and dependence Summerfield Permittivity Electrical impedance
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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