Hopping Conductance in Nanocomposites (Fe0.45Co0.45Zr0.10)x(Al2O3)1-x Manufactured by Ion-Beam Sputtering of Complex Target in Ar+O2 Ambient Gas

T.N. Kołtunowicza, P. Zhukowskia, V.V. Fedotovab, A.M. Saadc, and A.K. Fedotovd aLublin University of Technology, Nadbystrzycka 38a, 20-618 Lublin, Poland bScientific-Practical Material Research Centre NAS of Belarus, P. Brovki 19, 220072 Minsk, Belarus cAl-Balqa Applied University, P.O. Box 2041, Amman 11953, Jordan dBelarussian State University, Independence 4, 220030 Minsk, Belarus

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We report the investigation of a real part of the admittance σ of granular nanocomposites (Fe0.45Co0.45Zr0.10)x(Al2O3)1-x with 0.30 < x < 0.70 in the dielectric (hopping) regime. An analysis of the σ (T, f, x) dependences in the as-deposited and annealed films over the temperature 77 K < T < 300 K and frequency 50 < f < 106 Hz ranges displayed the predominance of an activation (hopping) conductance mechanism with dσ/dT > 0 for the samples below the percolation threshold xC ≈ 0.76 ± 0.05. Based on the earlier models for hopping AC conductance, computer simulation of the frequency coefficient αf of hopping conductance depending on the probability of jump p, frequency f, and also on the shape of σ(f) curve was performed. The experimental and simulation results revealed a good agreement.

DOI: 10.12693/APhysPolA.120.39 PACS numbers: 79.20.Rf, 73.22.-f, 84.37.+q, 72.20.Ee