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Effect of interparticle distance and interfacial area on the properties of insulator-conductor composites

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3 Author(s)
Deepa, K.S. ; National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695019, India ; Sebastian, M.T. ; James, J.

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The influence of conducting phase characteristics on dielectric properties of insulator-conductor composites was demonstrated by studying composites of polytetrafluoroethylene and different volume fractions of La0.5Sr0.5CoO3-y (LSCO). LSCO was prepared as coarse grained powder by solid state reaction and as fine powder by citrate gel method. The composites with fine powder of LSCO showed a rapid increase in dielectric constant and conductivity at 30%, while the corresponding value for coarse powder was 50%. The percolative behavior was found when the interparticle distance reduced to ∼250 nm in both cases. The permittivity and conductivity of the composites were found to increase with the interfacial area.

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Applied Physics Letters  (Volume:91 ,  Issue: 20 )