EFFECTS OF MECHANICAL PRESSURE ON CHARGE-TRANSPORT IN SOME FERROCENE DERIVATIVES IN THE PRESENCE OF ADSORBED VAPORS

The change in adsorption-induced electrical conductivity of some ferro cene derivatives as a function of temperature has been studied under m oderate pressures. At a constant cell temperature, the conductivity of the pure ferrocene derivatives in the dry state depends an the applie d pressure and this pressure dependence of conductivity is significant ly different for different materials. A spectacular change in the elec trical conductivity behaviour of these materials at the vapour-adsorbe d state, as a function of temperature under mechanical pressure, has b een observed. Pressure-induced change in conductivity of different fer rocene derivatives at the vapour-adsorbed state is remarkably differen t. The results have been discussed in the light of different existing theories. The unusual variation of conductivity with temperature under pressure is thought to be due to the phase transition in these materi als.