ELECTRON-SPIN-RESONANCE OF FECL3-FILLED POLYVINYLIDENE FLUORIDE

Electron spin resonance (ESR) measurements were carried out at room te mperature (=294 K), for FeCl3-filled polyvinylidene fluoride (PVDF) fi lms, over the filling mass fraction range of 0<W<0.40. The films were prepared by casting method. The ESR spectrum of the unfilled PVDF was complex, due to the hyperfine interactions, arisen from the free radic als. For PVDF filled with FeCl3 nearly symmetric Lorentzian ESR signal s, without hyperfine spectra, were found around g=1.92. This is attrib uted to the superexchange magnetic interactions among the symmetrical octahedrally coordinated Fe3+ ions. The effect of the filling level on the following ESR parameters are discussed: signal asymmetry line wid th, g-factor, relaxation time, spin (and orbital) magnetic moment, num ber of unpaired electrons per Fe ion and density of spin electrons.