Abstract
The electric conductivity of compressed mixtures of dendritic copper powder and carbonyl nickel has been measured in the pressure range of 4 … 200 MPa (about 40 … 2000 atmospheres) at ambient temperatures. The pure copper powders shows the well-known behaviour of smooth metal, covered with very thin, brittle, insulating layers. At low pressure, the powder mixtures can be described by percolation theory or similar hypotheses. Above 15 MPa (about 150 atmospheres) straight logarithmic mixing rules have been found. The conductivity of pure carbonyl nickel can be described by a uniform pressure exponent α ∼ 0.88. A new type of deviations from Ohm's law has been found, which occurs at low electric field strength.
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