Pr3+-substituted W-type barium ferrite: Preparation and electromagnetic properties

The W-type ferrites doped with Pr3+, BaCoNiPrxFe16-xO27(x=0-0.20), were prepared by a sol-gel method. The structure and electromagnetic properties of the samples are studied using powder X-ray diffraction, field emission scanning electron microscope, vibrating sample magnetometer and vector network analyzer. All the samples are hexagonal platelet-like W-type barium ferrite. These synthesized samples exhibit paramagnetism and strong magnetism. The saturation magnetization (Ms) increases with the increase of Pr3+ content. The real part of complex permittivity (epsilon') decreases and the imaginary part (epsilon '') increases with Fe3+ replaced by Pr3+. The imaginary part of complex permittivity (mu '') increases and the real part (mu') decreases after Pr3+ is doped. Furthermore, the doped Pr3+ improves the microwave absorbency. (C) 2011 Elsevier B.V. All rights reserved.