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Effect of short time reduction on electrical properties of bismuth-silicate glasses

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Author(s): Konrad Trzebiatowski | Joanna Gackowska | Witold Lizak | Leon Murawski

Journal: Optica Applicata
ISSN 0078-5466

Volume: 35;
Issue: 4;
Start page: 869;
Date: 2005;
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Keywords: bismuth-silicate glass | electrical conductivity | reduction in hydrogen

ABSTRACT
We have investigated the effect of short time reduction on the electrical conductivity of the 70SiO2–25Bi2O3–5K2O (mol%) bismuth silicate glasses. During a short time heat treatment in hydrogen (about 5 min at 375°C) the surface conductivity increases several orders of magnitude. It is suggested that in these samples the charge carriers transport is an electron hopping between localized states in defected silica films containing small Bi clusters. The influence of bismuth granules on conductivity is visible in the second stage of reduction, which takes place after longer than 4 h reduction time. In this case the conductivity exhibits typical of granular metals behaviour.

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