Abstract

Electron paramagnetic and ferromagnetic resonances in a powder of polyacrylonitrile (PAN) pyrolyzed in a temperature range from 873 to 1273 K have been measured at ∼9 GHz. It has been ascertained that the paramagnetic spin concentration diminishes from 5.5 × 1020 to 2.1 × 1019 spins/cm3 and the half-width of an absorption line decreases from 0.35 to 0.21 mT with an increase of pyrolysis temperature from 873 to 1073 K. The magnetization dependence upon the magnetizing field strength in these specimens is found to contain a falling branch. In the pyrolysis temperature range from 1073 to 1273 K the data of the magnetic resonance and those obtained with the help of a vibromagnetometer have shown the formation of a ferromagnetic phase in the pyro-PAN.

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