Journals / Turkish Journal of Physics / 2005 / Cilt: 29 - Sayı: 2
Low Frequency Dispersion in Non-conducting Contacts in Humidity
- Journal
- Turkish Journal of Physics
- Pages
- 97–104
- DOI
- —
Abstract
To develop an enhanced understanding of an aspect of the charge transport mechanism in systems composed of solid-solid insulating contacts, the dynamic dielectric response of sand grains and of silica-silica rod contacts was investigated at dry and at 97% relative humidity (RH), in the frequency range 10-2 to105 Hz. In dry atmosphere no appreciable amount of conductivity is observed, while in humidity the response follows a strongly dispersive behaviour. Sharp rise in capacitance gives a clear evidence for the storage of charge in the transport process. Collectively, the conductance of the sand grains increases super-linearly with the number of contacts suggesting filamentary conduction paths. The conductance G of the silica-silica contacts varies almost inversely with the number of contacts pointing towards a uniformly distributed conduction mechanism. It is found that the conduction process, despite a reduction in the geometrical area at the point of contact, is not significantly limited at the interface between the connecting surfaces.
Özet
To develop an enhanced understanding of an aspect of the charge transport mechanism in systems composed of solid-solid insulating contacts, the dynamic dielectric response of sand grains and of silica-silica rod contacts was investigated at dry and at 97% relative humidity (RH), in the frequency range 10-2 to105 Hz. In dry atmosphere no appreciable amount of conductivity is observed, while in humidity the response follows a strongly dispersive behaviour. Sharp rise in capacitance gives a clear evidence for the storage of charge in the transport process. Collectively, the conductance of the sand grains increases super-linearly with the number of contacts suggesting filamentary conduction paths. The conductance G of the silica-silica contacts varies almost inversely with the number of contacts pointing towards a uniformly distributed conduction mechanism. It is found that the conduction process, despite a reduction in the geometrical area at the point of contact, is not significantly limited at the interface between the connecting surfaces.