Dynamics of the conductance temperature dependence for a composite based on linear polyethylene with impurity of soot and calcite

• Published in: Semiconductor Physics Quantum Electronics & Optoelectronics
• Date: 2019
• Main Authors: Poberezhets, S.I., Kovalchuk, O.V., Savchenko, B.M., Iskandarov, R.Sh., Kovalchuk, T.M., Poberezhets, I.I.
• Format: Article
• Language: English
• Published: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2019
• Subjects: Semiconductor physics
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/215499
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Dynamics of the conductance temperature dependence for a composite based on linear polyethylene with impurity of soot and calcite / S.I. Poberezhets, O.V. Kovalchuk, B.M. Savchenko, R.Sh. Iskandarov, T.M. Kovalchuk, I.I. Poberezhets // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2019. — Т. 22, № 3. — С. 285-292. — Бібліогр.: 29 назв. — англ.

Within the temperature range of 293 to 425 K and frequency 10⁻³ to 10⁶ Hz ranges by using direct and alternating currents, the dynamics of electrical conductance σ of linear polyethylene with the impurity of 20 wt.% soot and 20 wt.% CaCO₃ (calcite) has been investigated. It has been shown that for the solid state of polyethylene (below 380 K), the dependence of electrical conductance on the temperature T on both the direct (σᴅᴄ) and alternating (σᴀᴄ) currents can be described by the power dependence on T/(T-T₀) (where T₀ is the temperature of the phase transition for polyethylene). It has been shown that when being repeatedly measured, the σᴅᴄ and σᴀᴄ values increase, and the power indexes of temperature dependence decrease. The measured values are stable after the fourth measurement. The greatest changes in the conductance, depending on the first and second measurements (almost three orders of magnitude), were observed at a temperature close to T₀. It has been assumed that the dynamics of electrical conductance, depending on the number of measurements, is caused by the influence of the electric field on the ordering of impurity in the polymer. It has been shown that for T > 380 K, the typical for liquids Arrhenius dependence of σᴅᴄ and σᴀᴄ on temperature is observed. It has been found that at the first measurement, the temperature dependence of σᴅᴄ and σᴀᴄ can be described by two activation energies, while for a stable state (starting from the fourth measurement), by one activation energy (within the measurement error of the same for σᴅᴄ and σᴀᴄ and equal to 1 eV).