Magnetic and dielectric study of KBiFe2O5/CoFe2O4 composite.

In this work, (90)KBiFe2O5−(10)CoFe2O4 [KBFO(90)-CFO(10)] composite is synthesized in polycrystalline form following the sol-gel technique. The magnetic, dielectric, and signature of the magnetodielectric (MD) effect in the prepared composite is verified over a wide temperature range. The phase purity of the prepared KBFO-CFO composite is confirmed by the room temperature (RT) X-Ray diffraction technique. The RT magnetization study reveals the weak ferromagnetic nature of the composite. The dielectric study reveals an anomaly near 500 °C, expected to be a structural phase transition. The magnetic anomaly near the dielectric transition suggests the signature of the MD coupling of the composite. The composite's indirect band-gap of 1.01 eV made it suitable for technological applications. Finally, the prepared composite shows the signature of the MD effect, and the low band gap suggests it is ideal for photovoltaic applications. [ABSTRACT FROM AUTHOR]