Obtaining of hydroxylated fullerenes Y@C₈₂O_X(OH)Y, Y2@C82OX(OH)Y, Y2C2@C82OX(OH)Y and electrophysical characteristic of composite film based thereon

Abstract

The article presents, for the first time, the results of the research on composite film obtained from hydroxylated endohedral metallofullerenes (EMF) Y@C 82 , Y 2 @C 82, with Y 2 C 2 @C 82 and highest fullerenes as dopant. The composite film has been established to have electric conductivity and to be a ferroelectric with the value of residual polarization of $0.75 lC/cm 2. The impedance spectroscopy of this sample allowed us to determine dispersion of dielectric permittivity and conductivity in the range of frequencies of 0.5 Hz-100 MHz. It is stated that the value of the high-frequency dielectric permittivity of films is e 0 1 ¼ 2.8. However, with reduction in the electric field frequency, real and imaginary parts of e increase to values $10 4-10 5. Such increase in dielectric permittivity is connected with increase in polarizing caused by accumulation of mobile electric charges (electrons of ions, protons) on boundaries of the structural defects of a film, which are divided by thin dielectric interlayers. The film is solid electrolyte with the ionic conductivity of $5 Â 10 À7 S/cm.