Impact of In3+ cations on structure and electromagnetic state of M-type hexaferrites

The solid solutions of In3+ doped M-type strontium hexaferrites were produced using a conventional solid-state reaction method, and Rietveld analysis of the neutron diffraction patterns was conducted. In3+ cations occupy octahedral (4f(VI) and 12 k) and tetrahedral (4f(IV)) positions (SG = P6(3)/mmc (No. 194)). The average particle size is 837-650 nm. Curie tempearature (T-C) of the compounds monotonically decreased down to similar to 520 K with increasing x. A frustrated magnetic state was detected from ZFC and FC magnetizations. saturation magnetization (M-s) and effective magnetocrystalline anisotropy coefficient (k(eff)) were determined using the law of approach to saturation. A real permittivity (e ") maximum of similar to 3.3 at similar to 45.5 GHz and an imaginary permittivity (e//) of similar to 1.6 at similar to 42.3 GHz were observed for x = 0.1. A real permeability (mu') maximum of similar to 1.5 at similar to 36.2 GHz was observed for x = 0. A mu " imaginary permeability maximum of similar to 0.8 at similar to 38.3 GHz was observed for x = 0.1. The interpretation of the results is based on the type of dielectric polarization and the natural ferromagnetic resonance features. (c) 2022 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press.