MEASUREMENTS OF TRUE DARK CONDUCTIVITIES IN FERROCENE CRYSTALS,
Abstract
The report describes systematic dark conductivity measurements on a monomeric organic crystal. The material chosen is ferrocene, a metallo-organic compound, and single crystals were grown from solutions or the melt by the Bridgman technique. From the measurements performed, including four-probe measurements, voltage probing between contacts, guard ring methods, and long time observations, it can definitely be established that contact effects and dielectric relaxation have a minor effect on the resistance of the sample, provided sufficient time is allowed for the observation, and that a true dark conductivity and activation energy can be determined within a few percent accuracy. Furthermore, a slight anisotropy exists for the different crystal directions but the impurity content of the crystals does not significantly influence the conductivity, indicating an intrinsic type of conduction mechanism. These findings are supported by thermoelectric measurements on these materials which indicate that holes are, at room temperature, more mobile than electrons. The implications of these data for establishing a model for the dark conductivity are discussed and recommendations made for further investigations. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1964
- Accession Number
- AD0603815
Entities
People
- Claire Loscoe
- Edward Zehler
Organizations
- United States Army Communications-Electronics Command