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Open AccessFeature PaperArticle

Polaronic Conductivity in Iron Phosphate Glasses Containing B2O3

1
Ruđer Bošković Institute, 10000 Zagreb, Croatia
2
Department of Physics, Kafkas University, 36100 Kars, Turkey
3
Department of Physics, Gebze Technical University, 41400 Gebze, Kocaeli, Turkey
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(11), 2505; https://doi.org/10.3390/ma13112505
Received: 26 April 2020 / Revised: 22 May 2020 / Accepted: 26 May 2020 / Published: 30 May 2020
(This article belongs to the Special Issue Tunable Materials)
We report on the electrical properties of glasses with nominal composition xB2O3–(100 − x)[40Fe2O3–60P2O5],x = 2–20, mol.%. The conduction transport in these glasses is polaronic and shows a strong dependence on Fe2O3 content and polaron number density. The changes in DC conductivity are found not to be directly related to B2O3, however structural changes induced by its addition impact frequency-dependent conductivity. All glasses obey Summerfield and Sidebottom procedures of scaling conductivity spectra indicating that the polaronic mechanism does not change with temperature. An attempt to produce a super-master curve revealed that shape of the conductivity dispersion is the same for glasses with up to 15.0 mol.% B2O3 but differs for glass with the highest B2O3 content. This result could be related to the presence of borate units in the glass network. Moreover, the spatial extent of localized polaron motions increases with the decrease of polaron number density, however, this increase shows a larger slope than for previously reported iron phosphate glasses most probably due to the influence of B2O3 on glass structure and formation of polarons. While Summerfield scaling procedure fails, Sidebottom scaling yields a super-master curve, which indicates that polaronic hopping lengths also change with changing polaron number density in these glasses. View Full-Text
Keywords: iron phosphate glass; polaronic conductivity; glass–former oxide; structure–property relationship; impedance spectroscopy iron phosphate glass; polaronic conductivity; glass–former oxide; structure–property relationship; impedance spectroscopy
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Pavić, L.; Fazinić, S.; Ertap, H.; Karabulut, M.; Moguš-Milanković, A.; Šantić, A. Polaronic Conductivity in Iron Phosphate Glasses Containing B2O3. Materials 2020, 13, 2505.

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