The temperature and frequency dependences of the admittance real part σ(T, f ) in granular (Fe 45 Co 45 Zr 10 ) x (Al 2 O 3 ) 100-x nanocomposite films around the percolation threshold x C were investigated.The behaviour of σ(T, f ) vs. the temperature and frequency over the ranges 77-300 K and 50 Hz-1 MHz, respectively, displays the predominance of an activation (hopping) conductance mechanism for the samples below the percolation threshold x C and of a metallic one beyond the x C determined as 54 ± 2 at.%.The mean hopping range d for the nanoparticles diameter D was estimated at different metallic phase content x.
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Kołtunowicz et al. (2011) studied this question.
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