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Scaling features of conductivity spectra reveal complexities in ionic, polaronic and mixed ionic-polaronic conduction in phosphate glasses
Authors: Santic Ana | Nikolic Jurai | Pavic Luka | Banhatti Radha D. | Mošner Petr | Koudelka Ladislav | Mogus-Milankovic Andrea
Year: 2019
Type of publication: článek v odborném periodiku
Name of source: Acta Materialia
Publisher name: Pergamon-Elsevier Science Ltd.
Place: Oxford
Page from-to: 46-54
Titles:
Language Name Abstract Keywords
cze Škálovací charakter vodivostních spekter ukazuje na složitosti iontové, polaronové and směsné iontově-polaronové vodivosti ve fosfátových sklech Škálovací character v šesti řadách směsných iontově-polaronových skel o složení xWO(3)/MoO3-(30-0.5x)Li2O/Na2O/Ag2O-(30-0.5x)ZnO-40P(2)O(5), 0 <= x <= 60 mol%, byl studován s použitím Summerfieldova a Sidebottomova škálovacího postupu. Platnost Sidebottomova škálovacího postupu pro jednotlivá skla potvrzuje, že mechsanismus vodivosti se s teplotou nemění. Na druhou stranu Summerfieldovo škálování není platné pro všechna skla. Odhylka byla pozorována pro všechna skla s obsahem Li2O až do 20 mol% MoO3/WO3. Odchylka od Summerfieldova škálování byla též pozorována pro skla obsahující Li2O/Na2O/Ag2O se 30-40 mol% of WO3. Elektrická vodivost; iontová difuze; polaron; impedanční spektroskopie; fosfátová skla; vztah struktura-vlastnosti
eng Scaling features of conductivity spectra reveal complexities in ionic, polaronic and mixed ionic-polaronic conduction in phosphate glasses The scaling behaviour of six series of mixed ion-polaron glasses with the composition xWO(3)/MoO3-(30-0.5x)Li2O/Na2O/Ag2O-(30-0.5x)ZnO-40P(2)O(5), 0 <= x <= 60 mol%, has been studied using Summerfield and Sidebottom scaling procedures that are model free. The validity of the Sidebottom scaling procedure for each individual glass confirms that all glasses obey time-temperature superposition principle implying that the conduction mechanism does not change with temperature. On the other hand, Summerfield scaling is not found valid for all glasses. First, this deviation is observed in all glasses containing Li2O up to 20 mol% of MoO3/WO3. We relate this result to a non-typical interaction of Li+ ion with the compact zinc phosphate network resulting either in change of its hopping distance or in available conduction pathways for it as a function of temperature. Second, non-Summerfield scaling was also observed for glasses containing Li2O/Na2O/Ag2O with about 30 to 40 mol% of WO3. Thus, the origin of this deviation lies in the significant amounts of both types of charge carriers - ions and polarons, and their differently thermally activated mobilities. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Electrical conductivity; Ionic diffusion; Polaron; Impedance spectroscopy; Phosphate glasses; Structure-property relationship

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