Structural, magnetic and electrical characterization of Cr-doped lead-free multiferroic AlFeO3 prepared by co-precipitation and solid state method

Abstract

Polycrystalline samples AlFe[Formula: see text]Cr[Formula: see text]O3 synthetized by a solid state and a co-precipitation (cop) method show an orthorhombic system in space group Pc21n. It was found that the cation distribution and magnetic ordering depend toughly on the preparation conductions. The dielectric and conductivity properties of samples were studied as function of frequency and temperature. We deployed impedance spectroscopy in studying the dielectric behavior of AlFe[Formula: see text]Cr[Formula: see text]O3. The significant results of this work are as follows: For both samples, permittivity and dielectric loss are very sensitive to temperature and frequency variation. The presence of additional effects and conducting species in AFCr5 ceramics leads to high dielectric permittivity. The activation energy values point towards the small range motion of oxygen at low-temperature and long range motion at high-temperature. The dielectric response, in case of AFCr5-s, was assigned to both grain and grain boundaries. However, additional entity pores also contribute to dielectric belongings of AFCr5-cop.