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AC conductivities at 5 Hz-10 kHz and 78 K up to room temperature of bis- (ethanolammonium) Co 2 X 6 , and bis- (ethanolammonium) Cu 2 X 6 , X=C1 and Br are reported. At high temperatures, band type conduction prevails for all dimers. In the low temperature range  T&lt;  200 K the (Co 2 Br 6 ) -2  dimer conducts via small polarons and the other three dimers conduct via quantum mechanical tunneling. The obtained relaxation times for the different dimers were found to be 1.1 • 10 -14  s. The frequency dependence follows the universal power law σ ac  (ω) =  A ω s  .  The exponent  s  and the pre-factor  A  were found to be very sensitive to the phase transitions, with 5 showing a minimum or maximum at the transition temperature. Changes in the conduction mechanism are reflected by abrupt changes in the variation of the pre-factor  A  vs 1/T relation. The conduction is found to depend on the type of the halide ion rather than on the transition metal ion.

AC Conduction Mechanism in Perovskite-like Dimers (C 2 H 8 NO) 2 M 2 X 6 , M=Co/Cu, X=Cl/Br