Electrical characterization of borate glasses containing metallic granules

Chakravorty, D. ; Chakrabarti, S. (1980) Electrical characterization of borate glasses containing metallic granules Journal of Non-Crystalline Solids, 38-39 (1). pp. 295-299. ISSN 0022-3093

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002230...

Related URL: http://dx.doi.org/10.1016/0022-3093(80)90434-2


Borate glasses in the systems Na2O---B2O3 and PbO---B2O3 respectively have been prepared with a dispersion of metallic bismuth in them by melting a suitable mixture of oxides. Electron microscopic investigation shows that the microstructures of these materials consist of bismuth granules of dimensions varying between 100Å and 700Å dispersed in glass matrices. d.c. and a.c. resistivities of these composites have been measured in the temperature range 30°C to 200°C. The d.c. resistivity at temperatures below 120°C arises due to electron tunnelling between the metallic particles whereas the high temperature conduction is controlled by an ionic transport. The low temperature resistivity obeys a relation of the type (f) f-n with n having a value around 1.0.

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