Effect of Ni- Substitution on Structural, Magnetic and Dielectric Properties of KBiFe2O5

Abstract

The influence of Ni substitution on structural, magnetic and dielectric properties of potassium bismuth ferrite (KBiFe2O5) are investigated. Polycrystalline samples of KBiFe2.xNixO5 (x = 0, 0.1) are synthesized by citrate combustion method. For the phase purity of the samples X-ray diffraction is carried out. Based on the refinement result, all the samples are found to be crystallized in monoclinic structure with P2/c space group without any structural transformation. From the M-H hysteresis loop, Ni substituted sample shows enhanced magnetic moment compared to pure compound. The maximum magnetization tends to saturate with Ni doping. Temperature dependent dielectric constant (ε′) for both the samples are investigated over a temperature range of 300 K – 773 K. The ferroelectric to paraelectric transition is appeared at around 750 K for KBiFe2O5 and 705 K for Ni substituted sample. The appearance of magnetic transition in dielectric vs temperature curves give an indirect interpretation of magnetoelectric coupling.