Magnetic and electrical characterization of multiferroic BiFeO3
Abstract
Bismuth ferrite was synthesized via classic solid state reaction at 800°C. XRD results show high purity, highly crystalline BiFeO3 with distorted rhombohedral perovskite structure. An alternating capacitive-inductive behavior is seen in the Smith chart. The synthesized BiFeO3 was found to have high dielectric constants, 70-100 at frequencies 300 kHz to 400 MHz, and 200-600 at higher frequencies before reaching its self-resonance frequency of 600 MHz. The self-resonance frequency is quite low compared with other types of capacitors which could be due to the high residual inductive effect of the bismuth ferrite. Inductive Q factors at higher frequencies reached a maximum of 40. These high dielectric constants and high inductive effects of the bismuth ferrite sample are manifestations of its being a simultaneous perovskite ferroelectric and antiferromagnetic.
