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The films exhibited large thermal security, getting the heat at which decomposition begins into the period of 450-487 °C. Magnetic analyses indicated a saturation magnetization, coercitive power, and magnetic remanence of 27.9 emu g-1, 705 Oe, and 9.57 emu g-1, correspondingly, for the PEI/CoFe2O4 50 wt%. Electrical dimensions evidenced a rise in the conductivity from 4.42 10-9 S/cm for the neat PEI to 1.70 10-8 S/cm for PEI/CoFe2O4 50 wt% at 1 MHz. The subglass γ- and β-relaxations, main re
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