Structural, Dielectric and Magnetic Properties of Potassium Doped Bismuth Iron Oxide Thin Films

Add time:08/04/2019    Source:sciencedirect.com

During the last decade much attention has been devoted to multiferroic materials due to the simultaneous presence of ferromagnetic and ferroelectric properties. Among various materials bismuth iron oxide is a promising candidate but bismuth iron oxide exhibits antiferromagnetic behavior that limits its applications. In order to overcome this difficulty we here report synthesis and characterization of potassium doped bismuth iron oxide thin films prepared using spin coating and sol-gel method. The films are characterized using X-ray Diffractometer (XRD) and Vibrating Sample Magnetometer (VSM). Potassium has ionic radius of 1.64 Å and it replaces bismuth ions that has ionic radius of 1.17 Å. XRD results indicate that no peaks corresponding to potassium oxide appear at dopant concentration of 0.05, 0.15 and 0.25 in Bi1-xKxFeO3 indicating that potassium has successfully replaced bismuth in the host lattice. Films show ferromagnetic behavior instead of antiferromagnetic nature of bismuth iron oxide due to suppression of spiral spin structure and presence of mixed valence states of iron cations that arise due to charge compensation mechanism.

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