Obtaining of hydroxylated fullerenes Y@C82Ox(OH)y, Y2@C82Ox(OH)y, Y2C2@C82Ox(OH)y and electrophysical characteristic of composite film based thereon

Abstract

The paper presents, for the first time, the results of the research on composite film obtained from hydroxylated endohedral metallofullerenes (EMF) Y@C82, Y2@C82, with Y2C2@C82 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 μC/cm2. The impedance spectroscopy of the 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 ′=2.8. However with reduction in the electric field frequency real and imaginary parts of ε increase to values ~104-105. 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•10-7 S/cm.