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Fabrication of Conductive Glass Nanocomposites with Networks of Antimony Tin Oxide

Published online by Cambridge University Press:  05 June 2013

Timothy L. Pruyn  and
Rosario A. Gerhardt
Timothy L. Pruyn
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology Atlanta, GA 30332-0245, U.S.A.
Rosario A. Gerhardt
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology Atlanta, GA 30332-0245, U.S.A.
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Abstract

The percolation threshold in a ceramic composite depends on the processing conditions used to fabricate them along with the size and shape of the filler. In this study, borosilicate glass microspheres were used as the matrix material and nanosized antimony tin oxide (ATO) particles were used as the filler. The microsphere/ATO composites were fabricated by hot pressing around the glass transition temperature in order to control the viscosity. The pressure and temperature applied allowed the ATO to be confined to the spaces between certain glass particles, forming percolating networks at low volume fractions of the ATO. The electrical properties were examined using ac impedance spectroscopy. The impedance, electric modulus, and tan δ were studied which allowed for valuable insights in structure-property-processing relationships in these materials, along with determination of the percolation behavior in these composites. This analysis on samples right before percolation indicated that there was a highly resistive component affecting long range conductivity which is likely due to porosity at the triple points while the dielectric response is affected by the clusters of ATO nanoparticles. Based on this, the percolation of ATO should reduce down to lower concentrations if the processing conditions are improved to reduce this porosity and further segregate the ATO.

Keywords

compositeelectrical propertiesmicrostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1552: Symposium S – Nanostructured Metal Oxides for Advanced Applications , 2013 , pp. 65 - 70
Copyright
Copyright © Materials Research Society 2013 

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References

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