The Electrical Conductance of Pressed Powders, in Particular of Zinc Oxide

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Abstract
The electrical conductance of a pressed semiconducting material in powder form, representing a multiboundary semiconductor, is investigated. Experiments are described in which the dc conductance of the powder pressed between parallel plates in an evacuated chamber is determined for different pressures and temperatures. A model based on the change of the energy gaps with pressure is developed which accounts for the phenomena observed. Transient changes of conductance with time are observed for which only tentative explanations are suggested. Most of the experimental work refers to zinc oxide.