Effects of ion doping at different sites on electrical properties of multiferroic BiFeO₃ceramics

Abstract

Pure, La3+ doped at A site, V5+ doped at B site, and La3+ and V5+ co-doped multiferroic BiFeO3 ceramics: BiFeO3 (BFO), Bi0.85La0.15FeO3 (BLF), BiFe0.97V0.03O3 (BFV), Bi0.85La0.15Fe0.97V0.03O3 (BLFV), etc were successfully prepared by a rapid liquid sintering technique. X-ray diffraction indicated that these ceramics were of polycrystalline perovskite structures, accompanied with a tiny residual Bi2O3 phase. It was found that, among these ceramics, BLFV ceramic exhibited the best electrical properties. The leakage current density of BLFV ceramic was only 2.1 × 10−6 A cm−2 at 10 kV cm−1, two and one orders of magnitude lower than those of the BLF and BFV ceramics, respectively. In the measuring frequency of 4 KHz–1 MHz, the dielectric constants and losses of this sample exhibited slight variation and the lowest loss tangent was 0.08. The sample had a relatively saturated ferroelectric hysteresis loop. These suggested that the co-doped BiFeO3 ceramic by La3+ and V5+ at A and B sites showed advantages in application over the pure BFO, doped BLF and BFV ceramics, respectively.

Study of electric and magnetic properties of (Bi0.9Pb0.1) (Fe0.9Ti0.1)O3 nanomultiferroic system

“…The remnant polarization ͑Pr͒ and the coercive field are ϳ1.05 C / cm 2 and 10 kV/cm, respectively. The measured Pr is comparable to that of doped BFO ceramic prepared by Benfang et al, 29 Sahu and Rao, 30 and Zhu and Ye. 15 But the observed Pr value is much less than the theoretically predicted value.…”

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

“…A or B sites substitution in BFO can lead to reduction in leakage current, increase in resistivity, and enhancement in the ferroelectric and ferromagnetic properties. 13,14 Hence, there is a lot of research going on in the synthesis of suitably doped BFO. For example, Yu et al 13 3 (BFM) films in a wide range of electric fields.…”

“…13,14 Hence, there is a lot of research going on in the synthesis of suitably doped BFO. For example, Yu et al 13 3 (BFM) films in a wide range of electric fields. Kawae et al 16 have studied the leakage current density of Bi 1Àx Nd x Fe 1Ày Mn y O 3 (x ¼ 0À0.07 and y ¼ 0-0.07) thin films and achieved the lowest leakage current in the films with the composition of x ¼ 0.05 and y ¼ 0.03.…”

Effect of transition metal doping on multiferroic ordering inFeVO4

“…In order to elucidate the microscopic origins of the magnetoelectric coupling in these systems, there have been a number of investigations on the response of various multiferroic materials under different types of perturbations 6,7,8,9 . Within this broad field of study, chemical doping has been used effectively as a tool to study how the structural, magnetic, and electrical properties of multiferroics are affected by small changes in composition 10,11,12 . Doping studies have also been used to explore how the multiferroic ordering temperature changes and microscopic magnetic interactions that give rise to the multiferroic behavior are affected under perturbations, providing insight into the stability of the magnetic interactions 12,13,14,15 .…”