Influence of the Preparation Technique on the Resistance
of the PbSe + PbSeO₃ Two-Phase Composite

V. V. Tomaev, V. P. Miroshkin, and L. N. Gar’kin

St. Petersburg State University of Electrical Engineering (LETI),
ul. Professora Popova 5, St. Petersburg, 197376 Russia

e-mail: tvaza@mail.ru

Received October 6, 2005

Abstract—An anomalous change in the electrical conductivity near the phase transition temperature (343 K)
is revealed in a PbSe + PbSeO₃ two-phase polycrystalline composite. It is demonstrated that the observed effect
can be used in the design of chemical gas sensors, in which the chemisorption of a reducing or oxidizing gas
on the surface of the PbSe + PbSeO₃ composite should lead to a significant change in the electrical conductivity
at temperatures close to the phase transition point. The PbSe + PbSeO₃ composite is studied by impedance spec-
troscopy in the temperature range 293–393 K in a dry air atmosphere. It is found that the interaction of the sam-
ple with air oxygen under the controlled joint action of an ac electric field and heat can lead to both reversible
and irreversible changes in the electrical conductivity.

DOI: 10.1134/S1087659606050129

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