Evidence of magneto-dielectric coupling at room temperature in polycrystalline KBiFe2O5

Abstract

The phase pure polycrystalline KBiFe2O5with space group P2/c is synthesized following solid state reaction route. The temperature dependentreal and imaginary part of dielectric constant is studied over wide temperature (280 K to 850 K) and frequency range (100 Hz ≤ f ≤ 1 MHz). Two distinct anomaliesat around 390 K and 750K is observedin both real (ε) an imaginary (tanδ) part of dielectric constant which can be attributed to Maxwell-Wagner effect. Our DC susceptibility measurement up to room temperature does not show any transition even upto room temperature, giving an indication that its transition temperature is above room temperature. This aspect is further confirmed from M-H hysteresis loop which shows a weak ferromagnetic hysteresis loop at room temperature. The evidence of magnetodielectric (MD) coupling at room temperature is confirmedfrom magnetic field dependent dielectric measurement in the form of inverted butterfly shaped ε-H loop.