Dielectric, electrical, magnetic, and mechanical properties of Ni-Al ferrite/PANI composite films

ABSTRACT

The Ni-Al ferrite nanoparticles are synthesized by the flash auto-combustion method, and PANI is synthesized by the situ-chemical oxidative polymerization method. NiAl-ferrite/PANI/ x (PANI) Nanocomposite Films (x =  0.6 and 0.8) were prepared using a solution casting process. The X-ray results of the NiAl_xFe_2-xO₄/PANI composite manifest that the Ni-Al ferrite fully interacted with PANI molecules and the Ni-Al ferrite particles are embedded in the PANI chains from TEM and SEM images. The dielectric parameters ϵ′, ϵ″ and tan δ decreased with the increase in the frequency of the applied field. The modulus M″ spectra of the investigated samples show two relaxation peaks in two frequency regions. In Cole–Cole plot of M′ versus M″, a semicircular trend is observed, i.e. a non-Debye criterion. The presence of PANI in the NiAl_0.6Fe_1.4O₄/PANI composite films reduces the magnetic properties of the composite samples leading to the decrease of saturation magnetization and remanence magnetization.

KEYWORDS:

• Ferrite
• PANI
• nanocomposites
• dielectric
• mechanical

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