Tunable electromagnetic properties in barium hexagonal ferrites with dual-ion substitution

摘要

The electromagnetic properties in hexagonal ferrites are intrinsically associated with the crystalline structure. In this work, structural engineering via the chemical dual-ion substitution of Ni~(2+) and Zr~(4+) for Fe~(3+) in barium hexaferrites BaNi_xZr_xFe_(12-2x)O_(19) (x = 0, 0.1, 0.3, 0.5, 0.7 and 0.9) is exploited in demonstrating the tunability of electromagnetic properties. The effects of coupled substitution on structural, dielectric, magnetic and microwave absorbing properties were carried out. The well-defined and purified structure were confirmed in the barium hexaferrites. It is found that dual-ion chemical substitution not only promotes the dielectric polarization but also improves the magnetic ordering, which subsequently increases the electromagnetic loss and adjusts impedance matching. Enhanced reflection loss (RL) in modified barium hexaferrite with broadened absorption bandwidth will find widespread application in electromagnetic compatibility or stealth fields.