Pressure Dependence of the Electrical Conductivity of Ag2HgI4

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Abstract
The electrical conductivity of Ag2HgI4 is primarily ionic above the order—disorder transition temperature of 50°C. Below this critical temperature, there is an appreciable electronic component. The effect of pressure, at all temperatures, is initially to increase the conductivity. However, the conductivity passes through a maximum and decreases between 4000 and 6000 kg/cm2. This unusual pressure behavior is not explicable in terms of any simple model. A new phase, which is presumably an analog of that ocurring in AgI, appears above about 6000 kg/cm2. The conductivity in this phase is primarily electronic even at high temperatures. The data also suggest the possible existence of still another new phase between 4000 and 6000 kg/cm2. Despite the complicated pressure dependence, the temperature dependence has a simple activation energy at all pressures except in the immediate vicinity of the transition point.

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