V. V. Tomaev, V. P. Miroshkin, and L. N. Gar’kin
St. Petersburg State University of Electrical Engineering, ul. Professora Popova 5, St. Petersburg, 197376 Russia
Received November 16, 2005
Abstract—The electrical properties of 0.9SnO2 + 0.1CuO two-phase polycrystalline composite films are inves-
tigated by impedance spectroscopy in the temperature range 293–393 K. The main results are presented in the
form of frequency dependences of the real part Z ' and the imaginary part Z '' of the total impedance Z for the
samples under investigation at different temperatures. The results obtained are used to construct the loci of the
impedance Z in the Z ' and Z '' coordinates. The loci can be represented by two weakly overlapping semicircles
characterized by two parallel equivalent circuits R1C1 and R2C2 connected in series. The activation energies of
individual components contributing to the electrical conductivity of the sample are evaluated from the temper-
ature dependences of the electrical properties determined by impedance spectroscopy for the 0.9SnO2 +
0.1CuO two-phase composite. An equivalent electrical circuit corresponding to the total electrical response of
all individual components is proposed for the composite studied.
DOI: 10.1134/S1087659606040134
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