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A significant enhancement of sodium ion conductivity in phosphate glasses by addition of WO3 and MoO3: the effect of mixed conventional-conditional glass-forming oxides
Authors: Renka Sanja | Pavic Luka | Tricot Gregory | Mošner Petr | Koudelka Ladislav | Mogus-Milankovic Andrea | Santic Ana
Year: 2021
Type of publication: článek v odborném periodiku
Name of source: Physical Chemistry Chemical Physics
Publisher name: Royal Society of Chemistry
Place: Cambridge
Page from-to: 9761-9772
Titles:
Language Name Abstract Keywords
cze Zvýšení vodivosti sodných iontů ve fosforečnanových sklech přídavkem oxidu wolframového a molybdenového V rámci práce byl studován vliv strukturních změn na vodivost sodných iontů ve sklech připravených v kompozičních řadách 40Na(2)O-xMoO(3)-(60-x)P2O5 a 40Na(2)O-xWO(3)-(60-x)P2O5; x = 0-50 mol%. sodná fosforečnanová skla; WO3; MoO3; iontová vodivost
eng A significant enhancement of sodium ion conductivity in phosphate glasses by addition of WO3 and MoO3: the effect of mixed conventional-conditional glass-forming oxides Ion conducting oxide glasses are attractive materials for application in various electrochemical devices and an understanding of the structure-transport properties relationship is crucial for their development. An interesting effect of glass structure on the dynamics of mobile ions is the mixed glass-former effect which causes a non-linear change of ionic conductivity when glass-forming oxides get gradually substituted. Here, we report a strong, positive effect of structural changes on the conductivity of sodium ions in two glass systems 40Na(2)O-xMoO(3)-(60-x)P2O5 and 40Na(2)O-xWO(3)-(60-x)P2O5; x = 0-50 mol% where a conventional glass-forming oxide (P2O5) is gradually replaced by WO3/MoO3 which are conditional ones. In both glass systems, the compositional change in DC conductivity is non-linear, with the maximal increase of four orders of magnitude in the case of WO3 and three orders of magnitude in the case of MoO3. This significant enhancement of ionic conductivity is related to the formation of mixed phosphate-tungstate and phosphate-molybdate units in the glass network. The facilitating effect of these structural units on sodium ion dynamics is also observed in the changes of the shape of frequency-dependent conductivity and in the values of typical spatial extent of diffusion of sodium ions known as the Sidebottom length. sodium phosphate glasses; Wo3; MoO3; ion conductivity

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