Studies of silver–vanadate–phosphate glasses by Raman, EPR and impedance spectroscopy methods

Four different series of AgI–Ag 2O–V 2O 5–P 2O 5 glasses have been prepared, in a wide range of compositions defined by the ratio of r=[Ag 2O]/[V 2O 5+P 2O 5] and a parameter x (mol.% of AgI). DTA and Raman scattering experiments reveal that the glass-networks of the investigated glasses are determi...

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Bibliographic Details
Published in:Solid state ionics 2000-11, Vol.136 (1-2), p.1077-1083
Main Authors: Garbarczyk, J.E, Machowski, P, Wasiucionek, M, Tykarski, L, Bacewicz, R, Aleksiejuk, A
Format: Article
Language:English
Subjects:
DTA
EPR
Impedance spectroscopy
Mixed electronic–ionic conduction
Raman spectroscopy
Silver–vanadate–phosphate glasses
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Summary:Four different series of AgI–Ag 2O–V 2O 5–P 2O 5 glasses have been prepared, in a wide range of compositions defined by the ratio of r=[Ag 2O]/[V 2O 5+P 2O 5] and a parameter x (mol.% of AgI). DTA and Raman scattering experiments reveal that the glass-networks of the investigated glasses are determined mainly by r values, and the x (up to 40%) parameter plays a secondary role. EPR spectra show that the interactions between vanadium centers (which are essential for electronic hopping) strongly depend on crosslinking of the glass network. They dramatically weaken if the glass-network is broken by addition of a large amount of a glass-modifier (Ag 2O). Depending on values of r and x the character of electric conduction of the studied glasses changes from purely electronic through mixed to predominantly ionic (via Ag + cations).
ISSN:0167-2738
1872-7689
DOI:10.1016/S0167-2738(00)00504-X