First-Order Studies of Nanometric Biferroic

M. A. Ahmed, U. Seddik, N. G. Imam

Materials Science Lab.(1), Physics Department, Faculty of Science, Cairo University, Giza, Egypt.
Physics Department, Nuclear Research Center, Atomic Energy Authority, Cairo, Egypt.

DOI: 10.4236/wjcmp.2012.22012                

Abstract

Magnetoelectric biferroic nanocomposite with composition 0.5Ni_0.5Zn_0.5Fe₂O₄ + 0.5BaTiO₃ was synthesized by ceramic technique. The structural and electrical characterizations of the investigated nanocomposite are discussed and reported. The formation of nanosized composite with two separate phases was confirmed by X-ray diffraction, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). The variation of dielectric constant (ε'), dielectric loss factor (ε") and the ac conductivity (σac) of 0.5Ni_0.5Zn_0.5Fe₂O₄ + 0.5BaTiO₃ was investigated as a function of both frequency and temperature. Thermal hysteresis (first-order transition) was obtained during heating (300 - 830 K) and cooling runs (830 - 300 K). The exact transition temperature and the amount area of the thermal hysteresis depend on applied ac electric field. The delay (lagging) time between heating and cooling processes was esti-mated from the hysteresis loop area versus frequency. The conduction mechanism in the investigated samples was explained according to different models. This study enhances the use of this prepared system in memory applications.

Keywords

Biferroic; Nanocomposite; Nickel-Zinc Ferrite; Barium Titanate; Dielectric; Hysteresis; First-Order Transition

Conflicts of Interest

The authors declare no conflicts of interest.

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