Ferroelectric-Antiferroelectric Switch and Magnetic Semiconducting Properties in LaxBa1-xFe12O19 Multiferroic Ceramics

New multiferroic materials combining AFE and FM are rarely found. Room temperature and non-toxic AFE materials are of great application, so the different properties of AFE and FE may bring us new surprises. We are going to switch it from room temperature FE state to AFE state by replacing barium in BaFe12O19 with lanthanum. Firstly, the LaxBa1-xFe12O19 sample was prepared, and its structure was analyzed by XRD. It was found that the lattice shrinks with the increase of x, and the surface morphology was analyzed by SEM. Later, by performing ferroelectric and dielectric tests on LaxBa1-xFe12O19, it was found that L0.50 was in the FE state coexisting with the AFE state at room temperature, and L0.75 was in the AFE state at room temperature. And the dielectric anomalous peaks in the temperature spectra of and in the dielectric tests were analyzed to provide sufficient theoretical and experimental evidence for the effect of x on the phase composition of LaxBa1-xFe12O19. Finally, the magnetic semiconductor properties of LaxBa1-xFe12O19 were tested, which exhibited strong ferrimagnetic properties and were found to have larger forbidden band widths as x increased. These properties will provide opportunities for the discovery and application of new multiferroic materials.